ali 
THE GASTROPODA 157 
over the shell (Fig. 70). Genera—Cypraea, Linnaeus ; shell ventricose 
with a crenelated columella, Pustularia, Swainson ; differs from Cypraea 
in having an internal shell. Ovula, Bruguitre ; columella smooth, both 
ends of the aperture canaliculated (Fig. 136).  Pedicularia, Swainson ; 
attached to corals; foot small ; shell irregular with an expanded aperture. 
Erato, Risso; shell piriform, with a prominent spire. Faminy 46. 
-Trironipar, Adams. Shell turriculated and siphonated, thick, each 
Fic, 135. 
Female Janthina, with egg-float (a) attached to the foot. b, egg-capsules ; c, ctenidium; d, 
cephalic tentacles. (From Lankester, after Owen.) 
whorl of the spire provided with varices; foot broad and truncated 
anteriorly ; pallial siphon well developed ; a proboscis. _Genera—T'iton, 
Montfort ; varices not continuous from one whorl to another ; eyes at the 
bases of the tentacles (Fig. 44, A). Persona, Montfort ; whorls irregular ; 
eyes half-way up the tentacles. Ramnella, Lamarck ; varices continuous 
from one whorl to another. Faminy 47. COLUMBELLINIDAR, Fischer. An 
exclusively fossil family ; shell with prominent spire, narrow aperture, and 
callous columella. Genera—Columbellina, VOrbigny ; cretaceous. Colwm- 
bellaria, Rolle; Jurassic. Zittelia, Gemellaro; Jurassic. Petersia,Gemellaro ; 
Jurassic. Faminy 48. Cassrpipar, Adams. Shell ventricose, with 
elongated aperture and short spire; foot broad and rounded anteriorly ; 
proboscis and siphon long ; oper- 
culum with marginal nucleus. 
Genera—Cuassis, Lamarck ; shell 
varicose, with narrow aperture. 
Cassidaria, Lamarck ; shell with- 
out varices, aperture oval and 
canalicnlated. Onzscia, Sowerby ; 
shell oval, with a linear aperture. 
Famity 49. OocORYTHIDAER, 
Fischer. Shell globular and Bie eae 
ventricose ; aperture oval and BeuNEN CRE tee 5 a fants Ae ee sige 
canaliculated : operculum spiral. is naturally carried in a reflected condition so as 
; : to cover in the sides of the shell. (From Lan- 
Genus—Oocorys, Fischer ; abyssal. ester, after Owen.) 
Famity 50. Donipaxr, Adams. 
Shell ventricose, with short spire and wide aperture; no varices and 
no operculum ; foot very broad with projecting anterior angles ; siphon 
long. Genera—Dolium, Lamarck; shell with a short canal; ocular 
tubercles distinct from the tentacles; mantle’ not reflected over the 
shell. Pyrula, Lamarck ; canal long ; spire very short ; mantle reflected 
over the shell; eyes sessile (Fig. 71). Famity 51. Soarimpag, 
