download pdf

296 AmericaJi Seashelh
Genus Cavolina Abildgaard 1791
Shell squat, bulbous, horny-brown in color, characterized by a much
constricted aperture, which is, however, very broad transversely. Sides of
shell often prolonged into spine-like projections. Cavolinia is an alternate,
incorrect spelling, and Hyalaea Lamarck is a synonym of this genus.
Cavolina lojigirostris Lesueur Long-snout Cavoline
Worldwide, pelagic. (47° N. to 40° S.).
Figure 64V
5 to 9 mm. in length. Dorsal lip with a thin margin. Posterior portion
of the ventral lip markedly projecting laterally. Common. Hyalaea li?nbata
Orb. and H. angiilata Souleyet are synonyms.
Cavolina gibbosa Rang Gibbose Cavoline
Worldwide, pelagic. (43° N. to 38^ S.).
Figure 64\v
About 10 mm. in length. Dorsal lip with a thin margin. Shell without
appreciable lateral points. Ventral lip not more developed than the dorsal.
Ventral surface with an anterior transverse keel. Common.
Cavolina tridentata Forskal Three-toothed Cavoline
Worldwide, pelagic. (40° N. to 40° S.).
Figure 64U
10 to 20 mm. in length. Dorsal lip with a thin margin. Ventral Hp not
more developed than the dorsal one. Shell without appreciable lateral points.
The shell is as broad at the end of the lips as it is at the anterior end. C.
gibbosa is narrower at the ends of the lips. Hyalaea afflnis Orb. is merely a
form of this species. C. televms Linne might possibly be this species.
Figure 64. The Pteropods or Sea-hut- Pelseneer;m,0/i7(?n77JCo/z/7;777e//irRang;
terflies of American Waters, a, Spira- n, Creseis aciciila Rang; o, Styliola sub-
tella helicina Phipps; b, 5. lesuenri Orb.; zila Q & G; p, Creseis virgula Rang; q,
c, 5. retroversa Fleming; d, 5. biilnnoides Hyalocylis striata Rang; r, Cavolina i?i-
Orb.; e, S. trochiformis Orb.; f, Peracle fJexa Lesueur; s, Cavolina qiiadridentata
bispinosa Pelseneer; g, Peracle reticidata Lesueur; t, C trispinosa Lesueur; u, C.
Orb.; h, Spiratella infiata Orb.; i, Clio tridentata Forskal; v, C longirostris
cuspidata Bosc; j, Clio reciirva Children; Lesueur; w, C. gibbosa Rang; x, C. imk,
Clio pyramidata Linnc; 1, Clio polita cinata Rang.