CALYPTR.EA. 



273 



Genus CALYPTR^'A*, Lamarck. PL VI. f. 6. 



Body round : mantle very thin : head large, cloven at the 

 extremity : foot circular, somewhat thickened, especially in 

 front. 



Shell conical, with a wide base : heah central : mouth cir- 

 cular : diaphragm, incompletely spiral. 



The only species we possess was included by Lamarck 

 in the present genus ; Crucibulum extinctorium (or the 

 " cup and saucer limpet ") being the first named species. 

 Calyptrcea, or rather Calyptra, is now represented by the 

 Patella equestris of Linne, according to the Messrs. 

 Adams. These authors place our species in Galerus, 

 a genus which was named, but not described, by 

 Humphreys. P. equestris is the type of Schumacher s 

 genus Mitrularia. Under all the circumstances I prefer 

 retaining CalyptrcRa in the British list, leaving Schu- 

 macher^s genus Crucibulum to stand as above, and re- 

 jecting Galerus, If any change were necessary, it ought 

 in my opinion to be the adoption of Trochita^ as pro- 

 posed by the same learned Danish naturalist (Schu- 

 macher) for the Patella Chinensis of Linne, upon which 

 that genus was founded. 



Calyptr^a CniNEN'sist; Linne. 



pi. Ix. f. 3-5, and (animal) pi. B B. f. 8-13. 



Body yellowish or whitish, minutely speckled with flake- 

 white: mantle transparent, broader on one side than the 

 other: head short, terminating in a cloven orbilobed muzzle; 

 there is a slightly developed, semicircular plain- edged fleshy 

 lobe on each side of the neck : tentacles thick, cylindrical, and 

 rather short ; eyes small, seated on tubercles : foot somewhat 

 angulated in front. 



* From KaXvTTTpa, a woman's cap. 

 t Like a Chinese Mandarin's hat. 



N 5 



