254 



rROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



iu the middle near tlio riglit side, renal opening in tlie anterior angle, 

 both oritices of a lighter colour. Anus below and a litth; in front of 

 the respiratory orifice, near the foot margin. Foot with lateral grooves 

 of yellowish-white colour; sole broad, smooth, with a lighter median 



Athoracdplioriis Dciidi/i, n.sp. 



XII. The animal ; spirit specimeu : iiat. size. XIII. Transverse section of body. 

 XIV. Genitalia : nat. size. XY. Genitalia, anterior portion mafi'uitied. 

 XYI. Central tooth of radula, x 7'20. XVII. Sixth lateral tooth of 

 radula, x 720. 



[For lettering, see ante, p. 250.] 



band. Distinct grooves between sole and back, showing distinctly the 

 continuance of the dorsal oblique grooves. A thrc^ad-like line runs 

 the whole length between sole and lateral groove. (Spirit specimen.) 

 The dimensions of a good-sized example are : — 



1. Length over back from head to tail, 50mm. 



2. Length of sole, 40 mm. 



3. Width of back, 23 nnn. 



4. Breadth of sole, 11 mm. 



5. Ereadth of groove between sole and back, 4 mm. 



6. Distance of anus from right tentacle, 12 mm. 



7. Distance of anus from pidmonary orifice, 9 mm. 



8. Distance of anus from toot margin, 2-5 mm. 



9. Distance of pulmonary orifice from head, 18 mm. 



The reproductive organs (Figs. XIV, XV), which open close behind 

 the right tentacle, are very much on the same plan as those of A. pftpil- 

 /(ifi(s, but the following characters may be considered as of specific 

 distinction. The free and rather large cylindrical oviduct is greatly 

 dilated, and has the receptaculum seminis inserted at its posterior part. 

 The penis is about the same shape as in A. papiUafus, but somewhat 

 longer and distally convolute. The herma2:)hrodite gland is larger and 

 its duct longer tlian in A. papiUatus. The interior wall of the penis 

 is densely covered with oval papillae, which sometimes terminate in 

 a small sharp point. 



The digestive system does not show any marked difference from that 

 of A. p(q)illatus ; there is no diverticulum on the crop, and the jaw is 



