GENERA AND SPECIES. 13! 



477. umbilicaris, ^ in. whorls 5 or 6, shell a short cone ; spire 



short, apex inverted, mouth oval, expanding 

 below. 



474. rissoides, in. whorls 5, quickly enlarging, spire tapering 



to a blunt point, mouth oval. 



Shell not 



487. dolioformis, % 



476. conoidea, % 



479. conspicua, % 



turreted 

 in. whorls 3, body whorl very round. 



in. whorls 8, colour ivory-white, mouth oval, 

 outer lip with 8 or 9 grooves. 



i n whorls 8, colour chocolate or cream, mouth 

 squarish, angulated below, outer lip not 

 grooved. 



484. diaphana, 



469. nivosa 

 468. minima, 



471. clavula, 

 473. albclla, 



472. lukisi, 



480. unidentata 

 478. acuta, 



475. pallida, 



Whorls 4 to 7 



^ in. whorls 4, convex, upper part of each having 

 a thickened rim. 



^ in. whorls 4 or 5, tooth large, with umbilicus. 



$ in. whorls 4 or 5, mouth oval. 



^2 in. whorls 4 or 5, mouth oval, expanded below. 



in. whorls 5 or 6, nucleus apparent on apex of 

 spire, tooth small, without umbilicus. 



^,- in. whorls 5 or 6, mouth oval, expanded below 

 and contracted above, spire abrupt. 



^ in. whorls 6, flat, no umbilicus. 



in. whorls 6, mouth oval, expanded below and 

 contracted above, spire long and tapering. 



in. whorls 6 or 7, nucleus not apparent at apex 

 of spire, tooth small, with umbilicus. 



Of some of the species of OJostotnia there are several varieties, but none worth special 

 mention. 



Onchidium. (ONCHIDIID&.} Plate xx. 

 318. celticum, in. tentacles short and conical, with bulbous tips. 



Ostrea. (OSTREID&.) Plate iii. 

 32. edulis, 3j in. x 3 in. beaks small, lateral edges toothed or notched. 



Otina. (OTINIDM.) Plate xvii 

 204. otis, 



in. shell earshaped, thin and transparent, 

 whorls 2. 



Ovula. (CYPRJZIDJE.) Plate xxv. 



458. patula, i in. upper canal semi-tubular, lower canal short 



and broad. 



Pandora. (PANDORIDM.} Plate xv. 

 172. inaquivalvis, i^in. x fin. right valve overlapping left. 



