GENERA AND SPECIES. I 13 



Hinge line angular 



129. acnlcatum, 3^ in. x 3^ in. ribs large and spiny. 



138. norvegicum, 2 Jin. x 2 in. ribs faint and smooth, and absent on sides. 



Hinge line curved 



130. echinatum, 2 J in. x 2* in. ribs with triangular spines. 



136. edule, if in. x ij in. ribs with crested plates. 



134. fasciatum, J in. x J in. ribs prickly, but flat and smooth in front. 

 132. papillosum,^ in. x J in. ribs with white tubercles. 



135. iiodosum, Jin. x Jin. ribs rounded at the sides and covered with 



tubercles or spiny plates. 



137. minimum, fin. x -gin. ribs flat and covered with arched scales, 



often in a double row. 



Of 130 there are two varieties expansa, which is wider, ami ovata, which has ribs 

 much narrower than the furrow.s and a nearly straight dorsal margin. 



Of 132 there is a white variety lactea. 



Of 133 there is a variety subquadrata. which is squarish in shape. 



Two varieties of 134 have been named globosa,Vi\\\ch has the posterior side shorter, and 

 alba, which is white. 



Two varieties of 135 have also been named ovata, which is wider and coarsely marked, 

 and rosea, which is rosy pink. 



There are two varieties of 136 tustica, which is brown or orange in colour, and 

 small and thin, with the posterior side more wedge-shaped ; and cremilata, which is more 

 oval and has the front margin straight. 



Of 138 there are three varieties gibbet, which is smaller and more oblique; rotunda, 

 which is Hatter and rounder ; and. pallida, which is pale yellow in colour. 



Carychium. (AURICULID^E.) Plate xviii. 

 201. minimum, ^ in. shell transparent, whorls 5^. 



Ceratisolen. (SOLENIDJE.) Plate xiii. 



151. legumen, 4in.xiin. shell smaller at the anterior end, and pale 

 yellowish white. 



Cerithiopsis. (CERITHIID&.) Plate xxiv. 



447. lubercularis, in. . colour brown, 2 basal ridges, 13 or 14 whorls, 



last whorl but one with three rows of 

 tubercles. 



448. barleei, in - yellowish white, no basal ridges, 12 whorls, 



last whorl but one with three rows of 

 tubercles. 



449. pulchella, J in. yellowish brown, 4 thin ridges on the body 



whorl, 10 whorls, closely whorled and 

 cancellated. 



450. metaxa, % in. yellowish brown, 14 or 15 whorls, 5 thick 



ridges on the body whorl, and 4 on each of 

 the other whorls. 



451. costulata,' |- in. white, 12 whorls, longitudinal ribs promi- 



nent, sharp and curved. 

 There is a variety of 447 nass.i which is shorter and broader in proportion. 



