326 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



with deep grooves and numerous small papillae ; head-shield with 

 median groove ; anus on right side of mantle-area. Colour uniformly 

 yellowish-white, the larger papillae whitish. Head broad, oval, the 

 two tentacles retracted, mouth with two upper labial lobes which 

 nearly meet in the middle, surmounted by a median triangular lobe. 

 Notum with a deep median groove and inequidistant oblique lateral 

 grooves, about fifteen on each side, eight of which are post-pallial, most 

 of them bifurcating toward the margin ; the whole surface covered 

 with small granules, amongst which are numerous slightly larger 

 papilla in most of the side-fields behind the mantle-area. Head- 

 shield triangular with a median groove, the posterior part reaching 



4.. ^"^ 



to the mantle-area, which is triangular, its length nearly twice its 

 breadth, enclosed by grooves on all sides ; the respiratory orifice sub- 

 central; the renal aperture in the anterior angle. Anal opening close 

 to the mantle-area, j ust in front of the outer angle, with a curved pre- 

 anal groove. The generative orifice on the outer side of the right 

 tentacle ; the figure shows the exserted male organ thickly beset with 

 small, sharp papillae. The hyponotum is indistinct, the perinotum 

 consisting of tubercular oval swellings of the margin of the notum. 

 Sole aulacopod through contraction in alcohol, the side-fields with 

 numerous transverse grooves, central part smooth ; in front the sole is 

 separated from the head by a deep groove. Shell rudimentary, con- 

 sisting of very numerous and small calcareous grains, no larger ones 

 amongst them. 



Measurements of type-specimen : Length over back from head to 

 tip of tail, 92 mm. ; width of back to perinotum, 32 mm. ; sole — length 

 71, breadth 19 mm. ; breadth of hyponotum, 4 mm. ; distance of anus 

 from right tentacle, 1 6 mm. ; from pulmonary orifice, 5 mm. ; pulmonary 

 orifice from head, 22 mm. This slug, when alive and crawling, had 

 a length of 130 mm. 



Jaw (Fig. 5) elasmognathic, with a sharp median projection. Eadula 

 large, with numerous teeth. Central tooth (Fig. 6, c.) with three cusps, 

 the median small and with one cutting point, the lateral ones triangular 

 with two or three denticles on each. Lateral teeth (Fig. 6, lat.) with 

 four denticles, the inner one largest. 



