152 MANUAL OF THE MOLLUSCA. 



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Jnimal with a broad muzzle ; tentacles rather short ; lanceolate ; eyes on j 

 bnlgiugs at the outer bases of the tentacles; mantle-margin simple, sides j 

 plain. Found under stones, between tide-marks, and in shallow water j 

 (Cuming). ; 



Distr., 50 sp. W. Indies, Honduras, Brit., jNIedit., Africa, India, Philip- j 

 pines, China, Japan, New Zealand, Gallapagos, Chili. 



Fossil, 30 sp. Carb ? chalk—. Brit., France, &c. \ 



Sub-genera. Cnicibidum, Schmn. (Dispoteea, Say., Calj^peopsis, Less.) ; 

 Ex. C. rudis, PI. XL, fig. 12. Shell spinulose ; internal cup entire ; attached \ 

 by one of its sides. Distr., W. America, Japan, W. Indies. Pound on shells, \ 

 with its base worn, or smoothed by a shelly deposit (Gray). Between this | 

 section and the next there are several intermediate fonns. 



Trochita, Schum, (Infundibulum, J. Sby., Galerus, Humph. Trocha- ; 

 teUa and Siphopatella, Lesson.) T. radians, PI. XL, figs. 13, 14. (=Patella j 

 trochoides, Dillw.) T. sinensis, PI. XL, fig. 15. Shell circular, more or less j 

 distinctly spiral ; apex central ; interior ^dth a more or less complete sub- j 

 spiral partition. Distr., chiefly tropical, but ranges from Britain to New i 

 Zealand. T. prisca (McCoy) is found in the carb. limestone in Ireland ; and I 

 several large species occur in the London clay and Paris basin. The recent \ 

 C. sinensis — the " China-man's hat" of collectors — is found on the southern J 

 shores of England, and in the Mediterranean, in 5 — 10 fins, water (Forbes), j 

 Its lingual dentition is given by Loven ; — median teeth broad, hooked, den- 

 ticulated ; uncini 3, the fii'st hooked and serrated, 2, 3 claw-shaped, simple. 

 Ckepidula, Lam. ia 



Etym., crepidtila, a small sandal. I 



Type, C. fornicata, PL XL, fig. 16. Syn., crypta. Humph. 



Shell oval, limpet-like ; with a posterior, oblique marginal apex ; interior ) 

 polished, with a sheUy partition covering its posterior half, \ 



The crepidixlse resemble the fresh -water naviceUse in form ; but the inter- j 

 ual ledge which mimics the columella of the nerite, is here the basis of the I 

 adductor muscles. ' 



They are sedentary on stones and shells, in shallow water, and are some- ' 

 times found adhering to one another in groups of many successive generations. : 

 The specimens or species which live inside empty spiral shells are very thin, 

 nearly flat, and colourless. 



Distr., 40 sp. W. Indies, Honduras, Medit., W. Africa, Cape, India, 

 Australia, W. America. 



Fossil, 14 sp. Eocene — . France, N. America, Patagonia, 

 PiLEOPSis, Lam. Bonnet-limpet. 



Etym., pileos, a cap, and opsis, like. 



Syn., capulus, Montf, Brocchia, Bronn. 



Type, P. hungai-icus, PL XL, fig. 17. P. militaris, PL XL, fig. 18. 



