"^'iSi!^,i:t" ^MMm in the Uni.

OXYGNATHA. 153
European species of Helix, pp. 57-60. Also Helix conoidalis, Adams and
Rv., may possibly belong to this section.
b. Shell-lobes tongue-shaped, left cervical lobe divided into two. Shell
helicoid. X. mindanaensis, sp. n., p. 61 (the living animal pi. 1. fig. 1, the
shell pi. 2. fig. 1), Mindanao, lives on the ground; a variety, or perhaps distinct
species, p. 62. X. distincta (Pfr.), Cochinchina and Mindanao [is also
abundant in Siam], citrina (L.), Moluccas. The genital apparatus, jaw, and
dentition described and figured pi. 3. figs. 13 & 14, pi. 6. figs. 27 & 30, and
pi. 7. fig. 12. The following species, known from the shell only, probably
belong also to this section: nobilis, Pfr., and obliquata, Reeve, both from
Zamboanga, Mindanao, borneensis, Pfr., schumacheriana, Pfr., donovani, Pfr.,
and souleyetiana, Pfr., from Borneo.
c. Shell-lobes rudimentary or wanting, left cervical lobe not divided.
X. bistrialis, Beck, ligulata, Fer., tranquebarica, Fabr., belangeri, Desh., and
maderaspatana, Gray, all from S. India; the sexual apparatus, jaw, and dentition
of them described and figured pi 3. figs. 15, 16 & 26, pi 5. fig. 4,
pi 6. figs. 25 & 29, pi. 7. figs. 9-11. Semper, I. c. pp. 45-66.—The living
animal of Nanina ligulata (Fer.) is also described and figured by A. Craven,
Ann. mal. Belg. vol. iv. 1869, p. 93, pi. 3. According to this figure the
hinder end of the foot is broad and flat, as the Recorder has observed it in
N. (Rhysota) ovum, Val, and different from the elevated truncated extremity
of N citrina Ch.).
Ariophanta, Desmoulins. C. SEMPER characterizes this genus
in the following manner :—Both shell-lobes of the mantle
present in most species; a female appendicular gland, composed
of single lobuli, and connected with a calcareous sagitta; no
appendicular glands on the male sexual organ. This genus is
represented by the following species:—rumphii, v. d. Busch,
Java; martini, Pfr., Sumatra; nemorensis, Miill., Celebes; rareguttata,
Mouss., Adenare; striata, Gray, Singapore; and atrofusca,
Albers, Singapore [and Borneo]. Genital apparatus,
sagitta, jaw, and dentition of some of the species described and
figured pi. 3. figs. 17-20, pi. 5. figs. 14 and 24, pi. 6. fig. 31,
pi. 7. figs. 5-8. No species known from the Philippines. Semper,
I. c. pp. 50-54.
Nanina (Ariophanta) immerita, sp. n., Blanford, J. A. S. B. xxxix. p. 17>
South Canara.
Rhysota, Albers; also elevated to the rank of a genus by C. Semper.
Shell-lobes quite absent; left cervical lobe divided into two parts. Sexual
apparatus simple, without appendicular glands. All known species belong to
the Philippines, and can be arranged according to the sculpture of the shell.
a. Shell wrinkled. R. ovum, Val, Luzon; maxima, Pfr., E. and N. Mindanao
; porphyria, Pfr., Burias Island; and dvitija, 0. Semper, Luzon. The
sexual apparatus, jaw, and dentition of these four species described and
figured pi 4. figs. 1, 6 & 8, pi. 5. fig. 22, pi 7. figs. 15 & 16. A new species
belonging to this section, but known only from the shell, is R. antonii,
sp. n., Semper, I. c. p. 72, pi 2. f. 2, Luzon.
b. Shell decussated. R. bulla, Pfr., Luzon; semiglobosa, Pfr., Southern
Luzon, Bohol, Leyte, Samar, Mindanao, and Basilan; the shell varies much,
1870. [VOL. VII.] M