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

182
MOLLUSCOIDA.
the points of resemblance between the Brachiopoda and the
Articulata, principally the Annelides. The csecal prolongations
of the mantle in Terebratula, the polygonal cells in the shell of
the young Discina, find analogies among the Crustacea. The
substance of the shell of Discina appears by chemical experiments
to be chitinous. The setse or bristles of the Brachiopods are
secreted by follicles and surrounded by muscular fibres, like
those of the Annelides, and are also of identical structure with
them. In the early stages of Discina these bristles are large
and are moved freely by the animal, as in many worms and
some young Polyzoa. The lophophore of the Brachiopods is
compared to the arm-like supports of the gills in some tubicolous
Annelids, as Sabella, and the mantle to the cephalic
collar. The soft folds or lamellae of the internal surface of the
mantle, the existence of which is proved by Morse, are compared
to similar features in the Balanidse. The blood of Lingula
is red as in some Annelides. The peculiar oviducts, with their
trumpet-shaped openings, are quite unlike those of any mollusk,
but bear close resemblance to those of many worms. He comes
to the conclusion that the Brachiopoda should be removed from
the Mollusca and placed within the Articulata among the
Annelides, forming a highly cephalized division of that class.
P. Bost. Soc. June 1, 1870; abstracts in Am. J. Sc. 1. pp. 100-
104, and Ann. N. H. (4) pp. 267-270.
DALL, W. H., pubbshing a revision of the genera and subgenera
of the Terebratulidae and Lingulidse, Am. Journ. Conch, vi.
pp. 87-168, opposes this removal, pp. 87-95.
Terebratulina septentrioncdis (Couthouy) kept distinct from the European
caput-serpentis Ch.). Gould, Invert. Mass. 2nd edit. p. 208.
Terebratella caurina, Gould, from Puget Sound, Dall, I. c. p. 139, pi. 6.
figs. 1-3.—T., sp. (an suffusa, Reeve P), ibid. p. 122, pi. 8. fig. 4.
Luqueus, new subgenus of Terebratella. The reflected portion of the loop
attached by slender processes on each side to the hamal processes at or near
the points where the two septal processes branch off to the septum. Foramen
complete. L. califamicus, Koch, Dall, 1. c. p. 123, pi 8. figs. 9,10; and
L. suffusus, sp. n. ?, 1. c. p. 123, pi. 7. fig. dh.
Terebratella, subgenus Ismenia, King; I. sanguinea (Chemn.), Dall, I.e.
p. 127, pi. 8. fig. 13.
Magus patagonica, Gould, Dall, ibid. p. 133, pi. 6. figs. 11,12, from Orange
Harbour, Patagonia.
Magasella, new subgenus of Magas. The reflected portions of the apophyses
united, forming a loop. Magasella fiexuosa (King) = magellanica
(Reeve); M. leevis, sp. n. ? =makinec (Orb.)?, both from Orange Harbour,
Patagonia; M. spitzbevgensis (Davids.), e-nmingi (Davids.), and crenulata
(.Sow.), Dall, I. c. pp. 135-138; leevis figured, pi. 6. figs. 9,10, and 13.
Megev/ia. Platgdia dacidsoni, Deslongchamps, belongs to the genus Megerlia,
and is probably an abnormal form of M. truncata. Jeffrevs, Ann. N. H.
(4) vi. p. 457.