bloomer: on the BRITISH SPECIES OF THE GENUS SOLEN. 



EXPLANATION OF PLATE IL 



Eig, i8, Solen ensis, L, Semi-diagrammatic figure of the nervous 



system, seen from the left side. 



Fig, 19, do The Cerebro-pleural gangUa, viewed from 



the ventral suiface. x 2, 



Fig, 20, do The Viscero-parietal ganglia, viewed from 



the ventral surface, x 2, 



Reference 



A. A. Anterior adductor muscle. 



A.P.N. Anterior pallial nerve. 



B.N. Branchial nerve. 



Ce.P. Cerebro-pedal connective. 



Ce. V. Cerebro-visceral connective. 



C.P.C. Cerebro-pleural commissure. 



C.P.G. Cerebro-pleural ganglion. 



D.A.N. Dorsal nerve of the anterior 

 adductor muscle. 



D.I.S. Point where the dorsal integu- 

 ment is connected with the 

 teeth of the shell. 



F. Foot. 



F.A. Fourth aperture. 



I.C.N. Inner circumpallial nerve. 



Letters. 



L. Liver. 



M. Mouth. 



M.L. Mantle lobe. 



O.C.N. Outer circumpallial nerve. 



P. A. Posterior adductor muscle. 



P.G. Pedal ganglion. 



P.P.N. Posterior pallial nerve. 



P. P. A. Bifurcated parts of retractor 



pedis anterior muscle. 

 P. P. P. Bifurcated parts of retractor 



pedis posterior muscle. 

 S. Siphon. 



V.A.N. Ventral nerve of the anterior 



adductor muscle. 

 V.P.G. Viscero-parietal ganglion. 



