1867.] DU. J. E. GRAY ON THK CALYPTR.EID.E. 743 



Shell circular, conical ; ajjcx acute, central ; nucleiis spiral, erect ; 

 cavity circular, regular, conical, with an oblique plate projecting into 

 the cavity on the pillar side, which has a narrow, conical, compressed, 

 cup-shaped cavity on its outer margin. 



1. Galerus extinctorius, Adams. 



Cahjptrcea extinctoria, Lamk. 

 C. niorbidum, Reeve. 



Shell smooth, white, with diverging brown lines ; the lamina as 

 wide as the width of the cup-shaped cavity. 



Surface distorted. C. vei-rucosum, Reeve. (C. laevigata, Chenu, 

 Man. f. 2337.) 



Hah. Molucca ; Tranquebar ; China. 



2. Galerus lividus. 



Calyptrcea lividum. Reeve. 



Shell dark brown, horn-colour, pellucid ; the lamina near the 

 cup-shaped cavity very narrow, not nearly so wide as the cavity, 

 Hab, ? 



Tribe VI. Shell circular, regular, conical, suhspiral ; apex central, 

 acute; nucleus spiral ; cavity regvlur, conical, with an oblique 

 or spiral lamina from the apex, which is elongate, with a slightly 

 reflexed edge near the apex of the cavity, or shorter, oblique, 

 with the pillar-edge reflexed, making a more or less deep and 

 large cup-like appendage. Dispoteana. 



The passage from the small, slender, deep perforation under the re- 

 flexed portion of the pillar-lip to the large cup-like appendage of the 

 Cup-and-Saucer Limpet (Crucibulum) is very gradual. 



* Cup-like cavity large, compressed, narrow, close on the inner sur- 

 face of the shell. 



1. Neleta. 



Shell subcircular, conical, depressed; apex acute, central; nucleus 

 spiral, radiately costate ; cavity circular, conical, with a narrow com- 

 pressed deej) cup-shaped concavity on the side, attached to the shell 

 by the whole of its inner surface, open to the tip ; the side next to 

 cavity of the shell not thickened or rounded. 



Very diiferent from the young of Crucibxdum scutellatum, and 

 from Catellina pectinatum, by the compressed form of the cup, and 

 by the cup not being callous at the tip. 



Neleta serrata. 



Calyptrcea serrata, Brod. 



Shell conical, depressed ; cone ratlier thin, pellucid, strongly ra- 



