1894.] SLUG OF THE GENUS JANELLA. 529 



and consists of a number of loosely-connected lobes. This same 

 organ in J. bitentaculata is very definite and compact in form, and 

 may readily be divided into two villiform portious (fig. 2, Ji.gl). A 

 long convoluted duct connects the gland with the common duct. 



Kff. 3. 



v.d- 



Portion of the generative organs of Janella maculata in natural position. 

 (For lettering see p. 527.) 



Fisr. 4. 



Showing the distinctness between the penis and vas deferens in an example 



of Janella bitentaculata. 



(For lettering see p. 527.) 



Digestive System. — The mouth, which has the usual ventral 

 position common to the genus, opens into the buccal cavity, which 

 passes into a short oesophagus leading into a wide crop. In neither 

 this species nor J. bitentaculata have I been able to trace any 

 diverticulum of the crop as figured by Iveferstein 1 . The intestine 

 makes a double fold in the lobes of the liver, which is proportion- 

 ately larger and more loosely folded than in J. bitentaculata. 

 Embedded in the lobes of the liver is the small ovoid stomach. 

 The intestine continues as a long convoluted tube terminating at 

 the anus. 



The two specimens of J. maculata measured 33 and 34 millim. 

 in leugth, and the specimen of J. bitentaculata which was dissected 

 48 millim. Professor Cockerell 2 , in describing the characteristics 

 of Neojanella dubla, states that it was 53 millim. long (in alcohol), 

 while the example of J. bitentaculata he examined was only 16 

 millim., and he further mentions that Grray's type in the British 

 Museum collection is only 19 millim. long. Of course, if these 

 sizes were characteristic of the species named, they would lend 



1 Op. tit. fig. 3. 

 - Op. tit. p. 226. 



