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PROCEEDINGS OF THE MALACOLOGICAL SOCIETT, 



of each cyst is apparently directly continuous with that of an 

 adjacent pulmonaiy vessel, while the contained yellow cells are, but 

 for their colour, not altogether unlike the blood-corpuscles. 



Fi<nires of portions of the anatomy of BuUmulus auris-sciuri, Guppy. — I. Collar 

 of mantle, right side, viewed from below, showing the pulmonary (P) and 

 excretory (E) orifices, and the collar lobes. II. Genitalia : A, portion of 

 albumen gland ; H, II', hemaphrodite duct (the gland was missing) ; 0, genital 

 orifice; P, penis ; S, spennatheca : V D, vas deferens. III. Central teeth of 

 the radula. IV. Jaw, seen from the front (x 13). 



The above figure (II.) will render further description of the genital 

 organs unnecessary ; unfortunately, as the visceral sac was partly 

 broken away in removing the animal from its shell, the ovotestis 

 and part of the albumen gland are missing from the drawing. 



The radula (Fig. III.) consisted of about 140 rows, having the 

 formula 54 : 1 : 54. The lateral teeth differ from each other mainly in 

 tlie fact that the diminution in size, which is correlated with approach 

 towards the periphery of the radula, is accompanied by a comparative 

 enlargement of the outer cusp, which, as is sliown in the figure, is 

 insignificant in the more central teeth. 



The jaw (Fig- IV.) was semicircular and minutely plicated. 



Nothing was observed in the nervous, circulatory, or muscular 

 systems which called for special remark. 



