CALYPTRiED^. 63 



with the sides of the conical form a little concave ; septum 

 obtusely hatchet-shaped. 



7. POCULUM, f. 80, 84, Reeve. — Parva sordida rotunda 

 convexo-conica tenuis cornea ; septo trigono-spirali. — Small, 

 cup-shaped, dull greenish brown, with a small hatchet-shaped 

 septum. The specimens originally described were covered 

 with an extraneous growth. 



8. PELLUCiDA, f. 82, Reeve. — Parva, subovata, depressa, 

 cornea pellucida ; septo trigono-spirali. — The difference 

 between this and the preceding species is very small, but 

 the latter is more depressed and thin. T. poculum,, f. 84, is 

 undistinguishable . 



9. LATERALIS, f. 93, 94, Soiverbjj. — Solida, oblique com- 

 pressa, divaricatim rugoso-corrugata, albida, partim castaneo 

 nebulata, lamina septiformi spirali, complanata, medio sub- 

 umbilicato, margine undulatim arcuato ; spira trispirata. — 

 Something like an obliquely flattened trochus with hollow 

 base. 



10. CALTPTRyEFORMis, f. 85, 86, Lcimarck. — Solida, splrali- 

 ter crepiduliformis, purpureo suffusa et extus obscure fas- 

 ciata, lamina basali arcuatim recedenti, medio anguste 

 umbilicato ; spira depressa, anfractibus tribus subcomplanatis. 

 Although in this and the next species there is an approach 

 to the form of Crepidula, yet the septum is simply as the 

 base of the whorl of a spiral shell, 



11. MACULATA, f. 87, 88, Qiioy. — Rotunde crepiduliformis, 

 intus purpurea, late unifasciata, extus epidermide straminea ■ 

 induta, anfractibus latiusculis convexis ; lamina basali latis- 

 sima, profunde subsidenti, margine arcuato. — More roimded, 

 convex in the whorls, and hollow at the base than the pre- 

 ceding species. It is otherwise known by a broad blackish 

 purple band seen strongly in the interior, and more ob- 

 scurely on the outer surface when the epidermis is removed. 



12. CLTPEOLUM, f 89, 90, Reeve. — Depresso-trochiformis, 

 intus alba, extus fuscata, epidermide Isevi induta ; apice 

 eentrali ; anfractibus quaternis, convexis ; lamina basali pro- 

 funde subsidenti ; margine septiformi undulatim subproducto. 

 In structure nearly approaching the tiochiform species, but 

 not, like them, conical in form. The septiform spiral base 

 is sunk far within the outer margin of the shell. 



Q 



