64 Records of the Indian Museum. [Voi,. XIX, 



1858. Siliqna, Miihlf., Adams, Gen. Recent Moll., II, p. 345. 



1870. Ma)iclinera. (iould, Report on the Invertehnita of Mass. (2nd 



Edition), p. 46, fig. 369. 

 1887. Silicjiia, Miihlf., Fischer, Man. Condi., p. 1109. 

 1889. Mancliaera, Gould, Clessin in Martini-Chemnitz, Conch. Cab., 



XI iSole,:acea), p. 57. 



The anatomy of two species of Siliqua lias been studied b}'' 

 Bloomer (13) The foUowino; diagnosis is drawn from his re- 

 searches : — 



Animal. Body elongated (but shorter than Solen and Ensis), 

 2 to 3 times as long as broad. Anterior and posterior margins 

 more or less rounded. Entire margin of each mantle lobe fringed 

 with a thin narrow membrane. Pedal aperture extending above 

 to the anterior end of the adductor muscle, and below about half- 

 way along the ventral margin. Siphon a single piece, wide and 

 comparatively short. A muscular ridge inside each mantle lobe 

 a short distance dorsal to the fused ventral margins. A strong 

 siphonal retractor muscle. No fourth aperture. Anterior adductor 

 muscle short and deep. Posterior adductor muscle slightl}^ elon- 

 gated and deep. Retractor pedis posterior muscle very small in 

 comparison with the posterior adductor muscle at its insertion. 

 Foot elongated and cylindrical, dilate and truncate obliquely at 

 the extremit^^ Fibres of the retractor pedis anterior muscle pass- 

 ing partly into the pedal integument and partly inside the longi- 

 tudinal muscle. Labial palps elongated and tapering. Anterior 

 lip placed immediately behind the anterior adductor muscle. Gills 

 broad and comparatively short, homorhabdic and non-plicate, 

 reaching the wall dividing the siphonal chambers. Attachments 

 of gills like Solen. Pyloric stomach very large. Coecum of the 

 crystalline style arising from the ventral side of the p3doric cham- 

 ber at its posterior end, large and directed towards the front. 

 Intestine like Solen. Digestive gland not reaching the anterior 

 adductor muscle. Heart in the middle of the pericardial chamber. 

 A single nerve from each cerebro-pleural ganglion. Viscero-parietal 

 ganglia situated between the bifurcation of the retractor pedis 

 posterior muscle, with a branchial and a posterior pallial nerve 

 from each ganglion. 



The anatomical peculiarities of the present genus tend to show 

 that the animals are in many respects more primiti\e than the 

 other members of the subfamily. 



Subfam. NOVACULININAE, nov. 



The present subfamily is made to include the single genus 

 Novaculina, Benson. It seems to be greatly removed from and 

 more primitive than the other two subfamilies. 



Animal. Body comparatively short and deep, ^yidened out 

 laterally, about twice as long as broad, straight anteriorly, and 

 concave posteriorly. Pedal aperture extending ventrally as a deep 

 wide notch at the an tero- ventral corner, not extending dorsally. 

 Fused ventral margins of the mantle lobes forming a very wide 



