94 LAND AND FEESHWATER 



arcuato-radiata , lineis irregularibus spiralihus obsolete decussata, 

 diaphana, vix nitldida, superne cinnamomeo-cornea ; spira parvtda, 

 subpapillatim elevata ; sutura impressa, marginata ; anfract. fere 4 

 planiuscidis, rapide accrescentibus, idtimo deprcsso, basi convexiore ; 

 apertura 2^^^'obU<pict, lunato-subcirculari ; per/s^ simplice, tenui, 

 marqine cohimellari i-egulariter arcunto. 



"Diam. 18|, alt. 8 mill. 



" Hab. ill insula Ceylon." 



In Mon. Hel. : — " Var. /3. major, spira vix elevata : diam. maj, 25, 

 min. 19, alt. 11 mill." 



Dimensions of shell dissected [Kegalle, Cej^lon, 600 ft., on cacao- 

 trees (0. CoUeft)]: — 



Major diam. 21*5, minor diam. 17 mm. 



Dimensions of a dark blue-grey specimen preserved in alcohol 

 [Botanical Gardens, Peradeniya, Ceylon (Freeman)'] : — 

 Major diam. 22*75, minor diam. 17*5 mm. 



This is very dark about the head, paling towards the hinder 

 part. Another specimen appears to have been dark olivaceous in 

 life. It shows that it varies much in coloration. 



Animal (fig. 1). Grey, with very pale (? yellow) tentacles. The 

 right shell-lobe has a tongue-shaped expansion at the side of the 

 respiratory orifice ; it then narrows and is continued backward 

 into a narrow fillet. The right dorsal lobe is large and extends 

 backward to the posterior side of the shell. The left shell-lobe 

 (fig. 2), commencing at the respiratory orifice, is narrow ; it widens 

 gradually, throws off a little tongue-shaped portion, and then nar- 

 rows again slightly to cover the posterior side of the shell. The 

 left dorsal lobe (fig. 2) is very ample and distinctly divided into two 

 portions. The great development of the dorsal lobes is a conspicuous 

 character in this species. 



The underside of the foot (fig. 3) is folded down the middle, and has 

 fine segmental lines running from the peripodial edge up to it ; in 

 this feature it is not in the least like the sole of the foot in Girasia 

 or even in species of Durgella, such as D. delchanensis. Under the 

 lens the surface is seen to be longitudinally striate *. 



Total length of specimen in spirit 40 mm., breadth of foot 9 mm. ; 

 from the extremity of foot to posterior side of shell 13 mm.; left 

 dorsal lobe from respiratory aperture to front edge 12 mm. ; breadth 

 of right dorsal lobe 12 mm. 



In the odontophore (fig. 8) the centrals are plain-sided, bluntly 

 pointed teeth ; at the 22nd and 23rd median a slight notch near 

 the apex is apparent ; the 24th tooth is evenly bicuspid, and it is 

 succeeded by no less than 180 similar formed teeth very gradually 

 decreasing in size ; next follow about 24 very minute teeth, which 

 are unicuspid. 



* In some specimens I have seen, through the kindness of Mr. Martin Wood- 

 ward, very hardened by alcohol, the central folding is not so marked ; still 

 there is no defined central area. 



