SCALPELLUM ROSTRATUM. 259 



[f t SUB-CARINA PRESENTE.] 

 4. SCALPELLUM ROSTRATUM. PL VI, fig. 7. 



S. (Herm.) valvis 15: rostro permagno : later urn paribus 

 quatuor : pari superiore pentagono. 



(Herm.) Capitulum with 15 valves : rostrum very large : 

 four pair of latera ; upper latera pentagonal. 



Mandibles with four teeth; maxillae with the inferior 

 angle prominent. 



Complemented Male, attached between the mouth 

 and adductor scutorum muscle; pedunculated; capitulum 

 bearing a pair of elongated scuta and a rudimentary 

 carina ; mouth and cirri prehensile. 



Philippine Archipelago; Island of Bantayan. Attached to a horny 

 coralline : 20 fathoms. Mus. Cuming. 



HERMAPHRODITE. 



Capitulum, with the upper part narrow and produced. 



Valves, 15 in number, placed close together, clouded 

 pale red, covered with membrane, which is thickly clothed 

 with minute points. 



Scuta rather small, oval, with the upper end pointed ; 

 rather convex ; basal and lateral margins blending into 

 each other; the upper produced portion above the umbo 

 is small ; there is a deep pit for the adductor muscle, and 

 there is a fold on the occludent margin in the usual 

 position ; occludent margin not straight. 



Terga large, one third of their own length longer than 

 the scuta ; flat, sub -triangular ; the three margins are not 

 quite straight ; the carinal margin projects a little above 

 the apex of the carina, and the scutal margin is excised 

 to fit the upper part of the scuta. 



Carina bowed, internally deeply concave ; upper por- 

 tion above the umbo, about one fourth of the total length, 

 extending between the terga for two thirds of their length, 



