BLOOMER : ANATOMY OF CERATISOLEN AND SOLECURTUS. 31 



22.-Columbella (Conidea) flava, Brag. 



Hab.—MekrAn Coast ; India : Karachi (Townsend), Bombay (Aber- 

 crombie). 



This is the C. fiavida of Lamarck. 



23.— Aesopus urapia, Melv. and St. 

 Hab. — Mekran Coast : Local. The wliite variety (albens) occurring with 

 the type. For a full description of this interesting mollusc, see the paper 

 above quoted, p. 407. 



THE ANATOMY OF CERTAIN SPECIES OF 

 CERATISOLEN AND SOLECURTUS- 



By H. H. bloomer. 



(Plate ii.) 



Ceratisolen legumen, L. 

 Owing to the many points of resemblance of Ceratisolen legumen to the 

 species of Solen, already described by me'", I purpose contrasting it with 

 Solen ensis in the same manner as I have dealt with *S'. siliqua, S. vagina, 

 and *S'. pellucidus. 



External Characters. 



C. legumen is comparatively shorter and deeper than S. ensis. It 

 not only curves slightly along its dorsal surface, but also along the ventral 

 one, particularly at the anterior end. The bands of pallial muscles pass 

 round the anterior part of the mantle lobes, and proceed posteriorly to 

 where the dorsal integument is connected with the teeth of the shell (Fig. 

 1, H.), the latter being situated some distance away from the anterior end. 



The foot (Fig. 1, F.) gradually increases in depth towards its distal end, 

 and is there of considerable size. 



The pedal aperture, situated at the anterior end, extends a short dis- 

 tance along the ventral surface, and the mantle lobes at the posterior part 

 of it carry on their inner surfaces a tentacular fringe, which evidently 

 represents the fovirth aperture (Fig. 1, F. A.). 



Along the dorsal surface from the anterior end to near the teeth of the 

 shell (Fig. 1, H.) there is no concrescence of the mantle lobes, thus forming 

 an aperture to a chamber superior to the anterior adductor muscle. An 

 teriorly this chamber communicates with the pallial chamber, the aperture 

 of which is continuous with the pedal aperture. The edges of the mantle 

 lobes bordering the whole of this dorsal chamber bear a tentacular fringe, 

 but the fringe does not pass round the anterior end of the lobes. 



Journ. Malac, 1901, pp. 36 & 97 ; 1902, pp. 18 & 133. 



