OF MOLLTJSCA. 187 



1. A. fascicularis, t. 154. f. 2, t. 207. f. 6, t. 209. f. 2. 



2. A. Garnotii, t. 207. f. 5. 



3. A. polychetus. 



4. A. roseus. 



5. A. Lesueurii. 



6. A. scaber. 



7. A. violaceus, t. 208. f. 3. 

 S. A. hastatus. 



9. A. hirundiniformis. 



10. A. strigatus. 



11. A. Zelandicus, t. 207. f. 2. 



12. A ?, t. 154. f. 4. 



M. de Blainville observes, that the valves of this genus are always 

 without any trace of the lateral area {Diet. Sci. Nat. xxxvi. 537), 

 but this must have arisen from his having only examined worn 

 specimens. 



21. Chitonellus. 



Body elongate, subcylindrical, back convex. Mantle covered with 

 short crowded calcareous spines, and the lateral pores small, with 

 short crowded calcareous spines ; exposed part of the front valve 

 oblong, square, broad, often worn, of the hinder ones narrow, lan- 

 ceolate ; the plates of insertion large, of first valve bilobed, of lateral 

 and hinder valves produced in front and scarcely notched on either 

 side. Gills occupying about one-third of the hinder side of the 

 foot. 



1. Ch. fasciatus, t. 208. f. 5. 



2. Ch. larviformis, t. 208. f. 4. 



3. Ch. Isevis. 



4. Ch. striatus. 



Lingual membrane of Chitonellus linear. Central tooth linear ; 



Fig. 99. — Teeth of Chitonellus from Tasmania. 



inner lateral small, linear, twice as long as broad, diverging ; outer 

 lateral large, with a large black convex apex, with three teeth on the 

 inner edge ; no external lateral teeth (fig. 99). 



c. Mantle covered with furfuraceous scales, the pores with tufts of 

 hair-like spines ; exposed part of the valve small, broad. 



22. Amicula. 

 Body ovate, convex ; back convex. Mantle covered with furfura- 

 ceous scales; the pores with a tuft of yellowish hair-like spines; 



