COLLINGE : FURTHER NOTES ON AMALlA CARINATA, RISSO. 133 



I think, there can be little doubt but that Risso's species has 

 been confused with A. soicerhyi in this country, and that on more 

 careful examination it will be found to be fairly well distributed. I 

 hope at a later date to give coloured figures of the British examples, 

 and also figures of the internal anatomy. 



In the meantime, I shall still be pleased to receive further examples 

 from any parts of the British Isles. 



Distribution in British Isles. 

 Devon.— Barnstaple (F. J. Partridge). 

 Warwick.— Near Birmingham (Bromley Peebles). 

 Dublin —Kingstown. Dr. Scharff'''' does not distinguish between A 

 ''arinafa, Risso, and A. soicerhyi, Fer., in his list. 



THE ANATOMY OF THE BRITISH SPECIES OF 

 THE GENUS SOLEN. 



Part IV. * 

 By H. H. bloomer. 



Plate X. 



Solen -pellucidxis, Penn. 



External Characters. 



When compared with »S'. ends, L., this species presents the following 

 points of difference : The measurement from the dorsal to the ventral 

 surface is proportionately greater. The hinge of the shell is situated 

 some distance from the anterior end, and the anterior part of the 

 anterior adductor muscle, together with the dorsal integument, termin- 

 ate there (PI. x, fig. i, H.). What represents the fourth aperture 

 is present at the posterio-ventral part of the pedal aperture. As in 

 S. ensis it carries a tentacular fringe. From specimens examined, I 

 have not been able to find any trace of concrescence of the mantle 

 lobes between the two apertures, but as this portion of the animal is 

 easily ruptured, the question still remains a matter of uncertainty. 

 The pedal aperture is larger, extending more posteriorly both dorsally 

 and ventrally. The dorsal and anterior edges of the mantle lobes 

 bordering it, carry a closely and finely crenulated fringe, while in 

 the dorsal portion, the mantle lobes are joined together a little below 

 their margins, thus forming a chamber, which apparently does not 

 communicate with the pallial chamber. The foot (PI. x, fig i, F.) 



3. Irish Naturalist, 1892. vol. i, p. 89. 

 * See ante p. \Z> 



