414 Dr. J. E. Gray on two neiv genera of Land Mollusca. 



culars, that I am inclined to believe it to be either the species 

 they observed, or at least a second species of the same genus ; 

 and as it offers some peculiarities not noticed in their descrip- 

 tion or figure, I shall proceed to characterize the genus. 



Janella. 



Body elongate, convex ; back rounded ; tail not keeled, taper- 

 ing, acute behind, without any subcaudal gland. Mantle covering 

 the whole of the back, with a slightly raised lateral margin, leaving 

 a I'ather broad space between the edge and the edge of the foot, 

 thin, smooth, with a longitudinal groove along the centre of the 

 back extending the whole length of the animal, and giving out 

 branches from each side which diverge backward to the edge ; 

 in front, over the head, there is given out a short, straight, di- 

 verging branch on each side to the hinder base of the tentacles, 

 then forked, and the two branches continued on the under cdg; 

 of the mantle to the corner of the mouth ; the tentacles two, 

 arising from the front just within the edge of the mantle, and 

 quite retractile like those of the Slugs. Aperture of respiration 

 is a very small round foramen, with a raised edge on the right side 

 and close to the central groove on the back, just above the aper- 

 ture of i-eproduction. ]\Iouth inferior, just at the end of the foot, 

 with three tubercles in front, which are formed by the continua- 

 tion of the grooves on the front of the mantle. Aperture for 

 reproductive organs on the front part of the edge of the right 

 side of the mantle, about one-fourth the entire length from the 

 head. 



The foot narrow, divided into three indistinctly-marked lon- 

 gitudinal bands, the middle band rather the widest, the lateral 

 bands with rather distant cross grooves, most distinct on the 

 outer edge, and with shorter marginal grooves between them, 

 giving the edge of the foot a crenated appearance ; the end of 

 the body is suddenly more slender, with a prominence on the 

 back just before this sudden alternation, as if the mass of the 

 viscera were confined to the first two-thirds of the body ; but this 

 may be caused by the contraction of the animal from being in 

 spirits. 



Shell none, or at least there is no appearance of any through 

 the skin. 



Janella antipodarwn. 



Hah. New Zealand. Length three-fourths of an inch. 



This genus is most allied to Fhilomycus (= Tebenopliorus, 

 B'mncy = Li7nacella, Blainville), with which it agrees in having 

 a thin mantle covering the whole of the back ; but it differs from 

 it in the position of the respiratory aperture, and in the presence of 



