276 MANUAL OF THE MOLLUSCA. 



CALYPTEiEA, Lam. Cup-and-saucer limpet. 



Etymology, calyptra, a (lady's) cap. 



Synonym, Lithedaphus, Owen. 



Types, C. equestris, PI. XI., Fig. 10. C. DillwjTiiiii, Fig. 11. 



Shell conical ; limpet-shaped ; apex posterior, with a minute, 

 spiral nucleus ; margin irregular ; interior with a half- cup 

 shaped process on the posterior side, attached to the apex, and 

 open in front. Surface rugose or cancellated. 



Animal with a broad muzzle ; tentacles rather short ; lanceo- 

 late ; eyes on bulgings at the outer bases of the tentacles ; 

 mantle-margin simple, sides plain. Found under stones, be- 

 tween tide-marks, and in shallow water. (Cuming.) 



Distrihuiion, 50 species. West Indies, Honduras, Britain, 

 Mediterranean, Africa, India, Philippines, China, Japan, New 

 Zealand, Gallapagos, Chili. 



Fossil, 31 species. Carb. ? chalk — . Britain, France, &c. 



Sub-genera. Crucibulum, Schum. (Dispotaea. Say . , Calypeopsis, 

 Less.) 



Example, C. rudis, PI. XL, Fig. 12. 



Shell spinulose ; internal cup entire ; attached by one of its 

 sides. 



Distribution, West America, Japan, West Indies. Found on 

 shells, with its base worn, or smoothed by a shelly deposit. 

 (Gray.) Between this section and the next there are seyeral 

 intermediate forms. 



Trochita, Schum. (Infundibulum, J. Sby., Galerus, Humph. 

 Trochatella and Siphopatella, Lesson.) T. radians, PL XL, 

 Figs. 13, 14. (=Patella trochoides, Dillw.). T. sinensis, 

 PI. XL, Fig. 15. 



Shell circular, more or less distinctly spiral ; apex central ; 

 interior witli a more or less complete sub -spiral partition. 



Distribution, chiefly tropical, but ranges from Britain to New 

 Zealand. » 



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

 and several large species occur in the London clay and Paris 

 basin. The recent C. sinensis — the "Chinaman's hat" of 

 collectors — is found on the southern shores of England, and in 

 the Mediterranean, in 5 — 10 fathoms water. (Forbes.) Its 

 lingual dentition is given by Loven ; median teeth broad, 

 hooked, denticulated ; uncini 3, the first hooked and serrated, 

 2, 3, claw-shaped, simple. 



Ckepidtjla, Lam» 

 Etymology, crepidula, a small sandaL 



