780 GASTROPODA. [Pulntonata. 



2. Paryphanta Edwardi, Suter. 1899. Plat* 48, fig. 12. 



/'>-!f } ,>Hirtt'i i'Amirdt. Suter. P. Mai. S., iii. 1899, 290. pi. 2. f. 22-25. 



*$'Ae/l fairly large, subdiscoidal, umbilicated, brownish-black, sub- 

 membranaceous, shining, very thin, and somewhat flexible. Sculp- 

 ture : The embryonic shell with radiate plications, the third whorl 

 malleated, the last somewhat irregularly obliquely radially plicated, 

 the folds crossed at right angles by more or less distinct obliquely 

 descending low cords : the whole surface ornamented with faint and 

 interrupted spiral strise. Colour of the first two whorls light brown, 

 the remainder blackish-olive : aperture inside of a dark-bluish tint. 

 Epidermis thin, coriaceous, shining. Spire low. broadly colloidal. 

 Protoconch of If whorls, broadly convex. Whorls 3f , rapidly increas- 

 ing, the last large, flatly convex; periphery and base convex. Sufur: 

 impressed. Aperture oblique, oval, but little excavated by the pen- 

 ultimate whorl. Peristome simple, thickened by the overlapping epi- 

 dermis. Columetta oblique, arcuate, but very little expanded above ; 

 parietal wall with a thin light-blue callosity. Umbilicus pervious, 

 moderate, about one-eighth of the minor diameter. 



Diameter Maj., 30 mm. ; min., 25 mm. : height, 20 mm. 



Embryonic shell subglobose, flat above, umbilicate. Diameter, 

 5-25 mm. ; height. 4-5 mm. 



Egg calcareous, white, roundly ovate, very finely granular. Dia- 

 meter. 5 mm. ; length, 6 mm. 



Animal a deep blue, darker laterally than on the dorsum. Mantle 

 greyish-white, with very fine sepia markings on the collar, which is 

 divided as in the genus Rhytida. Generative orifice 8-5 mm. from the 

 right upper tentacle. Rugfe irregular, very small posteriorly. Sulci 

 bluish-white. Peripodial groove ill defined. Foot-fringe bluish-white, 

 finely spotted, no lineoles. Foot-sole sepia-coloured, with a tinge of 

 blue in the median portion, not divided into median and lateral planes. 

 (Collinge, A.M.N.H. (7), vii, 70, pi. 2, f. 22.) 



Radula having the formula 26 + 1 + 26. The aculeate teeth in- 

 crease in size from the centre to the margin, except the last one, 

 which is smaller. The central tooth is short and with straight sides, 

 the five following teeth are similar but longer, they Mien take on a 

 more and more triangular shape. (Suter.) 



Generative Organs. The male organ is an almost straight tube, 

 widening in the distal half. Vas deferens a simple tube, not convoluted, 

 extending from the left side of the distal end of the verge to the pro- 

 static canal. Vagina large, at its extreme distal end a short sessile 

 receptaculurn snniirs. The free oviduct is very short. The common 

 duct is a long, almost straight tube. (Collinge. I.e.. 70. pi. 2, f. 25.) 



Ty/><- in my collection. 



Hob. Hossack Downs, Canterbury (E. 



