no MR. A. ADAMS ON JAPANESE FOSSARIDJS. [April 21, 



length. The postoccipital segment of the hody is long, of a dark 

 colour, somewhat wrinkled, and marked with three or four fleshy- 

 tubercles, on each side. The thoracic feet are three pairs, and are 

 broad, but short. As only one specimen was found, it was thought 

 unadvisable to dissect the whole worm out ; in consequence of which 

 the extremity has not been seen. I am unable to say whether it 

 terminates in a caudal appendage or not. 



The length of the exposed portion of the worm is li inch, the 

 breadth about 2 lines. Probably the part enclosed in the tube may 

 be of about equal length. 



Hub. Esquimau Harbour, Vancouver Island (Mus. Brit.). 



3. On the Genera and Species of Fossarid^ found in 

 Japan. By Arthur Adams, F.L.S., etc. 



Of all the different forms peculiar to this little group, the animal 

 of Fossar only has been examined. It is distinguished from that of 

 Littorina and Trichotropis by the possession of two frontal interten- 

 tacular lobes. In this respect it resembles that of the Trochidae ; 

 but the sides of the foot and the opercuHgerous lobe are simple. In 

 the 'Annals' for 1860 I suggested therefore the creation of a family 

 Fossaridae to include the genera Fossar and Isapis, to which I added 

 Conradia and Couthouyia, two new forms from the Sea of Japan. 

 I now add descriptions of Cithna and Gottoina, also new types from 

 the shores of the same archipelago. The species of Fossar which I 

 named F. japonicus I find identical with F. costatus, Brocc, which 

 inhabits the Mediterranean. 



Genus 1. Fossar, Adanson. 



1 . Fossar costatus, Brocc. 



Nerita costata, Brocc. p. 300, t. 11. f. 11. 



Delphinula costata, Bron. 



Purpura costata, Sow. 



Sigaretus costatus, Serres. 



Fossarus tornatilis, Gould, Otia, p. 110. 



Fossar japonicus, A. Ad. Annals, 1861. 



Hab. Seto-Uchi ; Kuro-Sima ; Tsu-Sima. 



2. Fossar trochlearis, A. Ad. Proc. Zool. Soc. 1853, p. 187. 

 Hab. 0-Sima. 



3. Fossar fenestratus, A. Ad. 



F. testa neritoidea, solida, alba, anguste umbiUcata, spira obtusa, 

 anfractu ultimo permagno, anfractibus cingulis quatuor elevatis 

 transversis et costis longitudinalibus validis late clathratis ; 

 apertura semiovata ; labia recto ; labro margine valde crenato. 



Hab. 0-Sima. 



A solid Neritoid species, with the spire obtuse, and the whorls very 

 coarsely clathrate. 



