GASTEROPODA. 159 



1. Calyptrea 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 laevigata. Desk. 2d edit. Lam. torn, vii, p. G23, 1836. 



— recta. Nyst. Coq. foss. de Belg. p. 361, pi. 35, fig. 11, 1844. 



— Sinensis. ... pi. 35, fig. 14. 



SQ.UAMULATA. ... pi. 35, fig. 13. 



— vulgaris. Phil. En. Moll. Sic. vol. ii, p. 93, 1844. 



— muricata. Dujard. M6m. Soc. Ge'ol. de France, t. 11, pt. 2, p. 274, 1837. 

 Infundibulum rotundum. 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, orbicularis conoided, plus minusve depressd, tenui, fragili, laviusculd 

 aut squamulatd; striata; striis remotiusculis ; spiraliterque circinatis ; vertice centralis 

 spird perspicud, ad dextram revolutd ; lamina interna, simplici incurvd. 



Shell variable, with an orbicular base, elevated ordepressedly 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 sliarp 

 and arcuated diaphragm, reflected and folded centrally. 



Diameter of base, 1^ 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 coolie'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. 



* Calyptr.ea 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 



