197 



and spring from swollen bases 2 mm. apart, their ocular bulbs are 

 rounded and symmetrical. The rest of the body is covered with 

 irregular polygonal tubercles which usually are partially sub- 

 divided into minor tubercles, those on the tail are round, small 

 and entire. At the origin of the left facial groove, two small 

 lobes spring from the mantle, they measure together 2x4 mm., 

 these are undoubtedly the homologues of the lobes which attain 

 so great a development in the Naninidcu. I have observed them 

 in other Hadrce, but am not aware whether these rudimentary 

 lobes are common to other divisions of the helices. 



Jaw arched, crossed asymetrically by nine stout flat-topped ribs 

 of various widths, the central the narrowest, denticulating both 

 margins, ends smooth, angled. 



Radula strap shaped, three times as long as broad, rows flattened 

 bracket (— '—) shaped, formula 180 rows of 39 : 18 : 1 : 18 : 39 ; 

 rachidian reflection unicuspidate, linguiform extending along two- 

 thirds of a base which is longer than wide and slightly expanded 

 posteriorly ; the immediate laterals are also unicuspidate and 

 linguiform, twice as large as the rachidian, the reflection cusp 

 falling short of the margin of the base whose alate angle is curved 

 and acuminate, the distant laterals are more slender and inclined 

 projecting past the basal margin ; the marginals acquire proximal 

 and distal accessory cusps which increase in size proportionaly as 

 the ranks retreat. 



In the genitalia the penis sac is expanded into a wide reniform 

 dilatation and bears at its apex a slender flagellum 15 mm. in 

 length, the ovoid spermatheca is seated at the termination of a 

 long duct. 



