36 ZOOLOGY OF THE VOYAGE OF H.M.S. SAMARANG. 



bronze line, the edges of which are yellow, bordered with vermilion ; eyes deep blue, with 

 black pupils, surmounted on long cylindrical peduncles ; tentacles white, with a narrow 

 vermilion streak along their anterior surface ; body cylindrical and much elongated, marked 

 with red-brown on the outer surface, white beneath ; foot narrow, rather dilated and rounded 

 in front, with a thickened anterior margin, small and subquadrate behind, the two portions 

 separated by a deep notch ; operculum ovate-triangular, annular, horny, semitransparent. 



The B. rectirostris, like the rest of the Alata, progresses by bending the foot under the 

 shell and suddenly straightening, which enables it to roll and leap over and over. It is 

 extremely timid in this respect, unlike B. Jissa, of which the animal is light brown varied 

 with lighter markings of the same colour. 



19. TEREBELLUM, Klein. 



The discovery of the living Terebettum has occasioned the removal of that genus to this 

 family, on account of its affinity with Strombus. The eyes are pedunculated, and the mantle 

 is characterized by the same peculiar divided edge. In the narrow form of the foot and 

 proboscis-like head it is allied to Struthiolaria and Jporrhais, and, like Oliva, the mantle 

 has a long filamentary cord winding into the sutures of the shell. 



1. Tekebelltjm subulatum. PI. IX. Fig. 6. Lamarck, Anim. sans vert. (Deshayes' edit.) vol. s. 

 p. 584. 



Hab. China and Sooloo Archipelago. 



The animal of Terebettum may be thus described : — Head proboscidiform ; tentacles 

 connate with the long cylindrical eye-peduncles, at the ends of which are placed the eyes ; 

 mantle with the right edge reflexed over the outer lip, produced in front into a short siphon, 

 and furnished behind with three or four filaments, the inner edge spread over the columella 

 and ending behind in a long slender filament, which occupies, as in Oliva, the channelled 

 suture of the spire ; foot large, ovate, fleshy, laterally compressed, with a lobe at the fore 

 part, rounded behind, and bearing a minute, horny, triangular operculum. 



The eye-peduncles of this species are finely dotted with brown, the proboscis and the 

 fore part of the body is punctulated with the same ; the rest of the body is opake white, 

 with three large irregularly-shaped red-brown blotches on the fore part ; the under-surface of 

 the foot is light brown, with a white subcruciate marking. 



The Terebettum is extremely shy in its movements. Poising its shell in a vertical position, and 

 cautiously protruding its longest telescope-eye from the truucature in the front of the shell, it will remain 

 stationary until assured of security. It will then use its pointed foot as a lever and roll its shell over and 

 over, progressing by a series of irregular leaps. When removed from the water before dying, it will jump 

 several inches from the ground. Mr. Cuming assures me his knowledge of the animal coincides with my 

 own experience, and that on one occasion he lost a fine specimen owing to its suddenly leaping from his 



