302 NEW i^OEK STATE MUSEUM 



Fig. 



4 An enlargement of the ganglion of the ocular tentacles, 



optic nerve and eye, x 12. 



5 An enlargement of the nerve and ganglion of the olfactory 



tentacle, x 12. 



6 Cryptoicus minutissimus, highly magnified. 



PLATE 14 

 Polygyra albolabris dissected and the organs separ- 

 ated: 1 buccal body; 2 esophagus; 3 crop; 4 stomach; 5 intestine; 

 6 rectum; 8 anus; 9 superior lobe of digestive gland; 10 inferior 

 lobe of digestive gland; 11 ducts of digestive gland; 12 salivary 

 ducts; 13 salivary glands; IJt penis; 15 vagina; 16 receptaculum 

 seminis; 11 retractor muscle; 18 glandular portion of the vas 

 deferens; 19 vas deferens; 20 spermatic duct; 21 uterine canal; 

 22 spermatic duct; 23 albumen gland; 2Jf hermaphroditic duct; 

 25 accessory gland of duct, or talon ; 26 ovotestes ; 21 renal organ 

 or kidney, the primary ureter along its upper side; 28 secondary 

 ureter; 29 opening of ureter, or renal duct; 30 ventricle; 31 

 auricle; 32 pericardiac cavity; 33 pulmonary vein; 3^ large blood 

 vessel connecting with pulmonary rete; 35 pulmonary rete; 36 

 supra-esophageal ganglia; 31 tentacular nerve; 38 nerves to 

 mouth and inferior tentacle; 39 superior tentacles; 40 integu- 

 ment; Jfl muscles from buccal body of integument; ^2 superior 

 tentacular muscle; J^3 inferior tentacular muscle; 44 retractor 

 muscles; 45 muscular peritoneum; 46 muscular collar; 47 cephalic 

 artery; If8 nerve to muscular collar. 



PLATE 15 



Limax maximus 



The same letters apply to the same organ in each figure. 

 Pio. 



1 The dorsal part of the integument is cut and turned back, 



showing the various organs in position. 



2 The pulmonary chamber, heart, etc. are turned back, show- 



ing the under side of the organs, and the parts concealed 

 by them in figure 1. 



