190 Description of the Plates. 



fications of the pulmonary veins. The cavity of the respi- 

 ratory sac is seen to be formed simply by the divarication 

 of the two layers of the general muscular envelope of the 

 viscera. 



0. Renal organ, placed to the right of the heart in the natural 

 position of the parts, and giving off a duct which passes 

 backwards and curves round, inclosing between itself and 

 its gland a portion of the pulmonary sac, to run in company 

 with the rectum to open near the anus. See enlarged figure 

 by Professor Leidy in Binney^s Terrestrial Molluscs of the 

 United States, vol. i., pi. i., fig. iv. 



2>. Ventricle of bilocular heart. 



q. Hermaphrodite gland. 



T. Hermaphrodite duct. 



s. Albuminiparous gland. 



t. Vas deferens becoming distinct from oviduct v sooner than 

 in Helix or Arion, and richly beset with prostatic glan- 

 dules. 



u. Penis, with part of its retractor muscle left attached to it ; the 

 origin of the muscle having been at a spot on the under 

 surface of the muscular envelope of the viscera, close to the 

 arterial outlet of the heart. 



V. Oviduct, like the vas deferens, glandular above, and membra- 

 nous below ; and opening into a dilated vagina. 



w. Receptaculum seminis, opening in this species, though not in 

 the closely allied L'lmax Cineretis into the vagina. 



X. Pedal portion of the suboesophageal nerve mass, enclosing, 

 together with the parieto-splanchnic, an orifice through 

 which the anterior aorta passes. The line is drawn to a 

 spot where in Helicidae the otic vesicle is readily found, 

 but where in Limax it is not easy to convince oneself that 

 it exists, even as a rudimentary organ, without the use of 

 reagents, such as the oxalic acid recommended by Lacaze 

 Duthiers. 



y. Coecum passing ofi" from intestine just before it passes into rela- 

 tion with the pulmonary cavity, and reaching down nearly 

 to the termination of the body cavity. 



z. Retractor muscle of the buccal mass and the tentacles. Its 

 fascicles distributed to the parts ^mentioned passed with the 



