| OCR Text |
Show 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 portions (fig. 2, h.gl). A long convoluted duct connects the gland with the c o m m o n duct. v.d • Portion of the generative organs of Janella maculata in natural position. (For lettering see p. 527.) Fig. 4. v-\ ov-\ vd 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 c o m m o n 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 Kefersteinl. The intestine makes a double fold in the lobes of the liver, which is proportionately 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 3 4 nullum in length, and the specimen of J. bitentaculata which was dissected 48 millim. Professor Cockerell2, in describing the characteristics of Neojanella dubia, 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 Gray's type in the_ British M u s e u m collection is only 19 millim. long. Of course, if these sizes were characteristic of the species named, they would lend 1 Op, cit. fig. 3. - Op. cit. p. 226. |
