GENERA AND SPECIES. 



Vitriua. (HELICIDM.} Plate xix. 

 247. pellucida, in. shell thin and green, no umbilicus. 



Viviparus. (VIVIPARID&.\ 



439. contecta, i in. 



440. vivipara, ij in. 



Plate xxiv. 



whorls 7, much rounded ; suture deep, 

 umbilicus deep. 



whorls 6, rather convex ; suture shallow, 

 umbilicus very slight. 



Xylophaga. (PHOLADID^.} Plate xiv. 



165. dorsalis, in. x ^ in. shell gaping widely anteriorly, apophysis of 

 the right valve larger than that of the left. 



Zonites. (HELICIDM. 



248. draparnaldi, 



Plate xix. 

 in. whorls 6 or 7 



striated transversely, fawn 

 above, bluish white below ; mouth oval and 

 very oblique, umbilicus wide, animal cobalt 

 blue. 



257. purus, ^ in. whorls 4, body whorl half of shell ; circular 



striae, umbilicus narrow and deep. 



258. radiatulus, in. whorls 4 or 4^, striae extending from whorl 



to whorl and not interrupted by sutures, 

 mouth semilunar and oblique, umbilicus 

 moderately deep. 



256. nitidulus, in. whorls 4 or 5, striae interrupted by the 



sutures, spire slightly produced, mouth 

 oblique or small. 



254 crystallinus, -fa in. whorls 4^ to 5, body whorl same as pre- 



ceding whorl, mouth lunate, umbilicus 

 small. 



255. nitidus, % in. whorls 5, shell sub-globose and brownish, 



mouth oblique and roundish, umbilicus 

 narrow and deep. 



249. alliarius, \ in. whorls 5, last whorl moderately large, 



exposing second whorl, mouth semilunar 

 and narrow. 



254. glabcr, ^ in. whorls 5 or 5^, body whorl occupying half 



of shell, which is thin, glossy, compressed, 

 transversely striated and dark horn-coloured; 

 mouth three-quarters of a circle, umbilicus 

 narrow and deep. 



252. excavatus, J in. whorls 5^, shell thin and horn-coloured, 



mouth small and lunate, umbilicus large, 

 disclosing all the whorls. 



253. fulvus, T V in. whorls 5^ or 6, shell keeled and conical. 



250. cellarius, f in. whorls 5 or 6, last whorl large ; shell pale 



horn-colour, mouth crescent shaped, um- 

 bilicus large, exposing second whorl. 



