Murdoch. — On the Anatomy of Paryphanta fumosa. 159 



Ketractor muscles : The buccal-mass retractor is very large, 

 almost equalling the pedal muscles. Both muscles coalesce 

 towards their posterior extremity. The tentacle-retractors 

 arise in separate bands from the posterior portion of the pedal 

 muscle ; they bifurcate towards their anterior ends and supply 

 the retractors to the inferior tentacles. The right ocular 

 retractor passes between the branches of the genital system. 

 The form and position of the muscles, with the exception of the 

 attachment of the retractor with the buccal mass, agree per- 

 fectly with the New Zealand ■s.^peciQ^— busby i,'-^'- urnula,\ and 

 hochstetteriA 



Pallial region (fig. 8) : The kidney is tongue-shaped, its 

 anterior end having a somewhat truncated appearance ; in 

 length it is twice its breadth, about half the length of the 

 lung, and about one-third longer than the pericardium. The 

 ureter is a well-marked tube of medium width ; it follows the 

 margin of the kidney, and appears to open into the right 

 posterior corner of the lung close to the rectum. 



The pericardium is in the usual position on the left side of 

 the kidney. The great efferent pulmonary vein follows the 

 margin of the ureter to a point almost in line with the right 

 border of the kidney ; thence proceeds forward towards the 

 respiratory pore. There are 3 comparatively large pigmented 

 efferent vessels on the cardiac side of the lung; also in front of 

 the respiratory pore are several small pigmented vessels from 

 both rectal and cardiac sides. On the rectal area of the lung 

 are numerous small efferent and afferent vessels, but they are 

 not pigmented, and it requires a very careful illumination to 

 show any trace of them. On the cardiac side are several 

 afferent vessels, two of which are comparatively large, and 

 with pigmented margins. 



Generative organs (figs. 9 and 10) : The atrium is very 

 short. The penis forms a simple sac of medium length, with 

 the retractor muscle inserted in the posterior end and attached 

 distally to the diaphragm. Its internal wall has a prominent 

 thickening, yellowish in colour and the surface covered with 

 minute granules ; it extends from the entrance of the vas 

 deferens to almost the anterior termination of the penis. The 

 vas deferens arises a little below the apex of the penis ; it has 

 a few slight convolutions, thence a slender uniform tube until 

 immediately before its union with the oviduct, where it is 

 enlarged, almost sac-like. The vagina is somewhat slender, 

 and in length rather more than equals the penis. The recep- 

 tacuium seminis is in the form of a small elongated sac, 

 situate close to the sacculated uterus, and when the organs 



* Trans. N.Z. Inst., vol. xxxv., pp. 258-62, pi. xxvii. 



t Proc. Malac. Soc, London, 1903, vol. v., pt. iv., pp. 270-73. 



