102 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



appendage, which might perhaps be regarded as the true flagellum, 

 is rather long, but much convoluted, and slightly swollen towards 

 its distal extremity ; its walls are rather thick and have a 

 gelatinous appearance ; its lumen seems to be extremely narrow. 

 The other flagellum, which might possibly be better termed the 

 caecum,^ is also somewhat swollen at the end, but its walls are very 

 thin, and have internal longitudinal folds, its lumen is relatively 

 large, and it is not convoluted but curved round usually in a more 

 or less spiral manner. 



The thinner-walled portion of the epiphallus, lying between the 

 two flagella, contains a certain amount of chalky material. This 

 consists of minute calcareous granules, varying in length from 

 "0025 to '006 mm., and about one-third as broad as they are long. 

 They are of a narrow, oval form, being narrower and more regular 

 in shape than are the calcareous granules in the epiphallus of 

 H. gomesianus, and in the present species they do not show as 

 great a tendency to become aggregated into concretions. 



Penis-sheath forming a structure about 5 mm. long, simulating 

 a large swollen penis. When cut open, however, it is seen to have 

 a long muscular tube folded inside it, the tube when straightened 

 out being more than twice the length of the sheath. At about the 

 middle of its length this tube shows a very slight swelling, which 

 marks the beginning of the true penis ; posterior to this point 

 the tube consists of a continuation of the epiphallus. When the 

 penis itself is opened it is seen that the slight swelling is caused by 

 the presence of a short penis-papilla, which projects into the 

 anterior end of the cavity of the penis. The walls of the penis 

 are furnished internally with characteristic diagonal folds, which 

 in places show a slight tendency to be broken up into a little 

 papillae. 



Genital atrium comparatively small. Amatorial organ absent. 



Spermatophore consisting of a smooth-walled cylinder, about 

 6 mm. long and "4 mm. in diameter, curved in accordance with the 

 loops of the more muscular division of the epiphallus in which it 

 was found, and having each end drawn out into a narrow filament 

 which was bent back upon the cylindrical portion. Of these two 

 filaments the one arising from the anterior end seemed to be much 

 the longer, exceeding the rest of the spermatophore in length, but 

 consisting simply of a very slender tube, quite smooth excepting 

 for a couple of slight longitudinal ridges running along it, one on 

 each side. 



^ This appendage corresponds to that which Pilsbry terms the "lime 

 gland " ; but in the forms with which I am acquainted it seems to be neither 

 glandular nor calcareous, the chalky granules in the epiphallus occurring 

 chiefly towards the base of the other flagellum. I therefore prefer Godwin- 

 Austen's terminology. 



