GASTEROPODA. 159 



1. CALYPTR^A CHINENSIS. Linn. Tab. XVIII, fig. 1, a e. 

 PATELLA CHINENSIS. Linn. Syst. Nat. p. 1257, 1766. 



SINENSIS. Gmel. p. 3692. 



ROTUNDA. List. Conch, t. 546, fig. 39. 



Park. Org. Rem. t. 5, fig. 10, 1811. 



ALBIDA. Don. Brit. Shells, pi. 129. 



CHINENSIS. Mont. Test. Brit. p. 489, t. 13, fig. 4, 1802. 



MURICATA. Brocchi. Conch, foss. Subapenn. pi. 1, fig. 2, 1814. 

 MITELLA SINENSIS. Leach, MS. 1818. 



CALYPTREA CHINENSIS. Flem. Brit. An. p. 362, 1828. 

 INFUNDIBULUM RECTUM. J. Sow. Min. Conch, t. 97, fig. 3, 1825. 



CLYPEUM. Woodward. Geol. of Norf. t. 3, fig. 2, 1833. 

 CALYPTR.EA L.EVIGATA. Desk. 2d edit. Lam. torn, vii, p. 623, 1836. 



RECTA. Nyst. Coq. foss. de Belg. p. 361, pi. 35, fig. U, 1844. 



SINENSIS. pi. 35, fig. 14. 



SQUAMULATA. pi. 35, fig. 13. 



VULGARIS. Phil. En. Moll. Sic. vol. ii, p. 93, 1844. 



MURICATA. Dujard. Mem. Soc. Gdol. de France, t. 11, pt. 2, p. 274, 1837. 

 INFUNDIBULUM ROTUND UM. S. Wood. Catalogue 1842. 



SUBSQUAMOSUM. Id. 



SINENSE. Morris. Cat. of Brit. Foss. p. 148, 1843. 

 CALYPTREA CHINENSIS. Thorpe. Brit. Mar. Conch, p. 136, 1844. 



C. Testa variabili, orbiculari, conoided, plus minusve depressd, tenui,fragili, laviusculd 

 aut squamulatd ; striatdj striis remotiusculis ; spiraliterque circinatis ; vertice centrali, 

 spird perspicud, ad dextram revolutd j lamina internet, simplici incurvd. 



Shell variable, with an orbicular base, elevated or depressedly conical, sometimes 

 nearly discoidal, generally smooth in its young state, often with one or more rows of 

 imbricated and elevated spines ; vertex central, with a visible spire, and a sharp 

 and arcuated diaphragm, reflected and folded centrally. 



Diameter of base, \\ inch. 



Locality. Cor. Crag, Sutton, Gedgrave, Ramsholt. 



Red Crag, passim. Recent, British Seas. 



Small specimens of this species are abundant in the Coralline as well as in the 

 Red Crag. In my Catalogue the large squamose and imbricated specimens were 

 supposed to have constituted another species ; but on an examination of more 

 specimens, the distinction is lost by the imperceptible gradation and intermingling the 

 one with the other, and the line of demarcation cannot be pointed out. Some specimens 

 are much elevated, like a Chinese Cooly's cap ; while others are so depressed as to be 

 almost discoidal. Some are imbricated all over the surface, while others have one, 

 sometimes two, rows of elevated spines.* M. Philippi considers P. muricata, Broc., 

 as only a variety, and I am of the same opinion. 



* CALYPTREA CHINENSIS. Vestiges of these spines may be detected in the recent British specimens, 

 even in those which do not exceed three eighths of an inch in diameter, although shells of that size are 



