195 



was thickened, and that there was no operculum. The following is the 

 only species. 



Figure. 



Pedicularia Sicula. PI. 22. Pig. 128. Shell, showing its mode of at- 

 tachment on a branch of coral. 



Genus FOSSARUS, PUlippi. 



Animal ; furnished with two frontal lobes between the tentacles; 



operculum ovate, subspiral. 

 Shell ; semiglobose, whorls ribbed or cancellated, axis perforate ; 



aperture semirotundate, entire, outer lip acute. 



The small Purpitra-Kke shell represented at Pig. 23, a native of the 

 coast of Senegal, was described originally by Adanson, the contemporary 

 of Linnseus, with the name Le Fossctr. Dr. Philippi, perceiving its pecu- 

 liarities, founded a genus upon it, Fossarus, identified with Adanson's 

 name. Two other species have been described from the Mediterranean, 

 and eleven have been added from the Eastern Seas and from South 

 America. 



1. abjectus, C. B. Ad. 



2. ambiguus, Linn. 



3. angiostoma, C. B. Ad. 



4. bicarinatus, Adams. 



5. clathratus, Phil. 



Species. 



6. cost at as, Bocc. 



7. Cumingii, Adams. 



8. excavatus, C. B. Ad. 



9. foveatus, id. 

 10. megastoma, id. 



11. pusillus, Gould. 



12. reticulatus, Adams. 



13. troclilearis, id. 



14. variegatus, id. 



Figure. 



Fossarus clathratus. PL 5. Fig. 23. Shell, showing its Purpura-like 

 form. 



Genus NEMATURA, Benson. 



Animal ; undescribed. 



Shell ; oval, compressed, apex of spire rather acuminate ; whorls 



