1920.] E. Ghosh : Anatomy of the Solenidae. 61 



The present genus is erected for the reception of Solen 

 pellttcidus, Pennant (Zool. Brit. IV, pi. 46, fig. 23). The anatomy 

 of Solen (Cultellus) pellucidus (7) and of two species of CitUellus 

 [C. javaniciis (ir), C. cultellus (16)] has been described by Bloomer 

 (7, II, 16). I have been able to stud^^ the animal of C. suhellip- 

 ticus, Dunker. The animal of C. pellucidus differs from those of the 

 other three species in having a fourth aperture, a suprapedal 

 chamber, an elongated anterior adductor muscle, very small 

 posterior adductor muscle, a wedge-shaped foot, a large coecum 

 with a long course, and lastly in having no fringe of long tentacles 

 round the distal margin of the siphonal tubes. These features, 

 along with an elongated bod}^, are sufficient to split the genus 

 Cultellus into two, and I suggest to form a new genus Suhcultellus 

 for Cultellus pellucidus. The relation of Suhcultellus with Cerati- 

 so/^w has already been dealt with. The present diagnosis is drawn 

 from Bloomer's work. 



Aniuuil. Body somewhat elongated (more than Cultellus). 

 Pedal aperture large, extending both dorsally and ventrally to 

 some distance posteriorly. Margins of pedal aperture crenulate. 

 A chamber formed dorsally b}?" the union of the mantle lobes a 

 little below their margins. A fourth aperture at the postero- 

 ventral end of the pedal aperture. Siphons separate, with very 

 short anal and branchial tubes. Anterior adductor muscle elon- 

 gated, wider posteriorly than anteriorly. Posterior adductor 

 muscle very smooth, but larger than retractor pedis posterior 

 muscle at its insertion. Foot large, wide anteriorly and termina- 

 ting in a deep obliquely truncate extremity. Fibres of the 

 retractor pedis anterior muscle passing outside the longitudinal 

 layers of muscles. Gills similar to those in Solen. Anterior lip 

 of mouth immediately behind the anterior adductor muscle. 

 Pyloric chamber very large, coecum of the crystalline style very 

 wide proximally and arising from the ventral aspect of the 

 pylorus ; it is of considerable length extending along the greater 

 portion of the visceral mass. Intestine of two simple limbs. 

 Digestive gland not extending over the anterior adductor muscle. 

 Heart at the anterior end of the pericardial chamber. 



Gen. Cultellus, Schumacher, 



1782-93. Soleti (pars), C. A. Linne, Syst. Nat., ed. XIII, pp. 3223, 



3224. 

 1817. Cultellus, Schumacher, Essai Nouv. Syst. Habit, des Vers 



Testace, pp. 43, 130, pi. vii, fig. 4. 

 1835. Solen Cultellus, Lin. and S. javaniciis, Lamk., Lamarck, Hist. 



Nat. Anim. Sans. Vert., Vl, pp. 56, 58. 

 1858. Cultellus, Schum., Adams, Gen. Recent Moll., 11, p. 344; III, 



pi, xciii, figs. 2, 2rt. 

 1S58. Pharella, Gray (pars), (Sole)i javaniciis, Lamarck) id., ibid., 



II, p. 344, pi. xciii, figs. I, la, lb. 

 1887, Cultellus, Schum., Fischer, Man. Conch., p. 1109. 

 1889. Cultellus, Schum., Clessin, Martini-Chemnitz. Condi. Cab., XI 



{Solenacea), p. 36. 



