At/toracoj'liorus.] GASTROPODA. 805 



Anatomy unknown. 



Type in my collection. 



Hob. Collingwood, South Island (J. Ball). 



Remarks. I have been unable to get more specimens of this very 

 interesting form, and my type specimen still remains a unicum. I 

 cannot agree with Plate that this species is merely a young specimen 

 of A. papillatus or A. Schauinslandi: The large oval crowded papilla- 

 distinguish it at once from all the other hitherto-known species. 



Subgeu. 4. AMPHICONOPHORA, Suter, 1897 (em.). 

 Amphikonophora, Sut., P. Mai. S., ii, 1897, 256. Type: A. giganteus, Suter. 



New Zealand slugs with dorsal median and lateral grooves ; mantle- 

 area distinct, triangular, with the renal orifice inside its anterior angle, 

 the pulmonary opening subcentral. Anus near the mantle-area, some- 

 times inside it. 



KEY TO SPECIES. 



a. Head-shield extending to mantle-area ; anus close to the latter. 



Central tooth of radula with 3 cusps and 5-7 denticles . . ijiyanteus. 



b. Head-shield extending to middle between head and mantle-area ; 



anus inside the latter. No central tooth on radula . . verrucosu*. 



9. Athoracophorus giganteus, Suter, 1909. Plate 31, figs. 12, a-c. 



Athoracophorus giganteus, Suter, P. Mai. S., viii, 1909, No. 5, 325, f. 4-7 in 

 text. A. marmoratus, Simroth : Suter, P. Mai. S., ii, 1897, 256, f. 18 in 

 text ; not of Simroth. 



Animal (spirit specimen) large, limaciform, broad in front and very 

 gradually tapering toward the broadly rounded tail ; back flatly 

 convex, 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 2 tentacles retracted, mouth with 2 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 15 on each side, 8 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 papillae in 

 most of the side fields behind the mantle-area. Head-shield triangular, 

 with a median groove, the posterior part reaching to the mantle-area, 

 which is triangular, its length nearly twice its breadth, enclosed by 

 grooves on all sides, the respiratory orifice subcentral ; the renal 

 aperture in the anterior angle. Anal opening close to the mantle-area, 

 just in front of the outer angle, with a curved preanal groove. The 

 generative orifice on the outer side of the right tentacle ; the figure 

 shows the exserted male organ thickly beset with small sharp papilla?. 

 The hyponotum is indistinct, the perinolum consisting of tubercular 

 oval swellings of the margin of the notum. Sole aulacopod through 

 contraction in alcohol, the side fields with numerous transverse grooves, 



