GODWIX-AUSTEN : ON PHILALANKA. 13 



The oclontophore (Figs. 4-4c) was equally interesting, and showed 

 the same affinities. The plates of the central teeth are square in shape, 

 the rhachidian being the narrowest ; they increase outwards in breadth 

 until the laterals are very broad, low, and oblong, whilst on the 

 outermost ones the cusps are difficult to detect and very irregular. 

 The centre tooth has a large pointed mesocone, with two basal cusps ; 

 the median teeth up to the eleventh are similar in shape, but with 

 only one cusp on the outer side ; the next, the twelfth, shows an inner 

 side cusp. In the thirteenth and fourteenth the centre is smaller, 

 with two equal-sized side cusps rising from the upper edge of the 

 plate. , In the succeeding teeth there is a good deal of irregularity 

 in profile, but the side cusps are split into two, now and then three, 

 the centre still remaining the longest or nearly the longest. The 

 dental formula is — 



20 : 2 : 10 : 1 : 10 : 2 : 20 or 

 32 : 1 : 32 



2. Philalanka Bolampattiensis, n.sp. PI. I, Fig. 6. 



Shell depressedly conoid, rounded and widely umbilicated below, 

 keeled. Sculpture : a single liration is situated about one-third the 

 breadth of the whorl on the upper side, following the sutural thread, 

 which commences on the keel ; fine vertical irregular lines of growth. 

 Colour pale horny. Spire depressedly pyramidal, sides flattened, apex 

 flatly rounded. Suture well marked. Whorls 6, convex below the 

 liration, flat above it. Aperture narrow, semilunate. Peristome 

 somewhat thickened, columellar margin reflected and very oblique. 

 Size: maj. diam. 5*0, alt. axis 2'6mm. 



ITah. ^Bolampatti Hills, Southern India (Colonel R. Beddome). 



Animal not seen. 



There is no doubt but that this is allied to the typical Ceylon 

 species, possessing all its principal characteristics ; it exhibits, how- 

 ever, a more depressed form. 



EXPLANATION OF PLATE I. 



Fig. 1. Philalanka secessa. Shell, x 4. 



,, la. Shell, showing umbilicus, x 8. 



,, 2. Eight and left dorsal lobes, x 24. 



,, 2a. Foot, viewed from right side, x 8. 



,, 2b. Extremity of foot from above, x 24. 



,, 3. Portions of jaw. x 275. 



,, 4. Odontophore. Central tooth and the three next. 



,, 4a. Lateral teeth, 10th to 16th. 



,, 'ib. still further from the centre. 



,, 4c. The four outermost teeth. 



,, 5. Generative organs, x 24. 



,, 6. Philalanka Bolampattiensis. Shell, x 8. 



l.d.l. Left dorsal lobe. r.m. Eetractor muscle. 



m. Mantle edge. sp. Spermatheca. 



p. Penis. v.d. Vas deferens. 

 r.cl.l. Eiffht dorsal lobe. 



