Murdoch. — On Paryphanta atranientaria. 315 



of the intestine are similar to other members, and call for no 

 special mention. 



The nervous system, with regard to the position of the several 

 ganglia and their connectives, is identical with other species 

 of the genus. The same may be said of the muscular system, 

 in so far as the form and position of the principal muscles, with 

 the exception of the form of attachment of the buccal-mass 

 retractor, which has already been dealt with. The right-tentacle 

 retractor passes between the branches of the genital system. 



The pedal gland forms a long, narrow, much-folded tube, 

 resting upon the floor of the body-cavity, its posterior end 

 imbedded in the muscles of the foot, to which it has a muscular 

 attachment. 



Generative Organs (fig. 5). — The penis forms an elongated, 

 club-shaped organ, with the retractor muscle inserted at the 

 apex. The vas deferens arises near to the distal end of the 

 penis ; proceeding forward it is for some distance attached to 

 the wall of the male organ, adding to th.e club-shaped appear- 

 ance of the latter; thence free, and reduced to a very slender 

 tube until it rests upon the anterior portion of the oviduct. 

 From this point it becomes somewhat more prominent, and 

 finally forms a sac-like enlargement as it enters the posterior 

 termination of the free tube of the oviduct. The interior walls 

 of the posterior portion of the penis, and the attached portion 

 of the vas deferens, are clothed with minute papillae-like struc- 

 tures. The receptaculum seminis arises from the free oviduct 

 where the latter becomes merged in the sacculations of the 

 uterus. It arises as a small sac, which in the natural position 

 of the organs is enveloped by a large fold of the uterus, thence 

 reduced to a slender tube, and terminating in an oval-shaped 

 enlargement tucked in at the base of the albumen-gland. The 

 albumen-gland is a large, irregularly ovate mass ; from it pro- 

 ceeds the hermaphrodite duct, which is somewhat convoluted. 

 The hermaphrodite gland consists of three or more follicular 

 masses imbedded in the right lobe of the liver. These structures 

 are difficult to follow, as in colour they are. similar to the sur- 

 rounding mass. 



Pallial Organs (fig. 6). — The kidney is shortly tongue-shaped, 

 narrowed anteriorly, and curved to the left, with the pericardium 

 resting against the left concave margin. In length it is about 

 one-third greater than the pericardium, and less than half the 

 length of the lung. The ureter follows the margin of the kidney 

 and opens into the right posterior corner of the lung, close to 

 the rectum. The venation of the lung is beautifully clear and 

 distinct, due to its pigmented condition. In the figure given 

 no attempt has been made to delineate the finer details, which 



