230 janellidjE. 



Genus JANELLA, Gray. 



Tentacles none ; eye-pedicels retractile, on the front edge 

 of the mantle. Mantle entirely covering the back, longitu- 

 dinally channelled; pulmonary aperture on the right side, 

 near the median line. Foot narrow, simple posteriorly. 



Shell none. 



Syn. Athoracophorus, Gould. 



Ex. A. bitentaculata, Quoij and Gaimard, pi. 80, fig. 5. 



MM. Quoy and Gaimard first observed the animal on 

 which this genus is founded, crawling on leaves in Tasman's 

 Bay, New Zealand, and indicated it as a new genus, to be 

 characterised by the absence of the inferior tentacles, the 

 fissure along the back, the position of the pulmonary orifice 

 on the right side near the middle of the back, and the 

 absence of a buckler concealing a horny piece or shell. Dr. 

 Gray observes that the genus is most nearly allied to PhiJo- 

 mycas, with which it agrees in having a thin mantle covering 

 the whole of the back, but that it differs from it in the posi- 

 tion of the respiratory aperture, and in the presence of only 

 two tentacles, which, instead of being placed on the head, as 

 in Philomycus and all the other Limacidce, are placed on 

 the front part of the mantle. Dr. Gould, who has described 

 the same genus under another name, has observed that the 

 animal has the habit of coiling itself up, when at rest, in a 

 manner not assumed by any of the Limacidas. 



Species of Janella. 



antipodarum, Gray. bitentaculata, Qvoy and 



Gaim. 



