MOLLUSCA OF INDIA. 69 



central tooth is small, consisting of one simple point; the median 

 teeth (figs. 7, 8) are long, uniform, and evenly bicuspid ; the outer- 

 most become serrated on the side below the bicuspid apes. The 

 whole are very closely packed together, and I found it impossible to 

 count the number in a row with any certainty. 



+ 350 . 1 . 350 to 400 



68 rows are showu on a radula whose breadth equals its length. 



I am indebted to Colonel R. Beddome, who has added so many 

 species of land-shells to the Indian list, for very kindly letting me 

 have these shells to describe and figure ; and I wish I could have 

 published them before now, but I thought it best not to do so until 

 they could be included with other species of the same genus. They 

 are of extreme interest as being the first species that can be in- 

 cluded in the subfamily Durgellinse from Southern India. They, 

 however, differ from typical Durgella to this extent: — 



1. In having no amatorial organ. 



2. In the longer overhanging lobe above the mucous gland. 



3. In the teeth of the radula being all bicuspid in the centre. 

 The nearest species to them is D. christiame of the Andaman 



Islands. 



In 1891, when describing in the P. Z. S. a large series of Bornean 

 shells collected by Mr. A. Everett, I placed in Durgella, p. 40, 

 a species named hosei, on the form of its shell-lobes and odonto- 

 phore, which last I give on Plate LXXIX. The radula (fig. 9) is 

 very similar to that of D. minuta, G.-A., of the Dafla Hills, described 

 in Vol. I. Pt. IV. p. 144, Plate XXXIX, figs. 1-6. The generative 

 organs were not seen. 



The genus now contains 9 species, which may be located in the 

 following groups : — 



Radula with very great number of teeth in the row. and of small size, the 

 breadth very large in proportion to the length. Jaw straight, weak. 



A. Wifk an amatorial organ. 



.,, ,, , ,1 • i. f levicida.'Bs Tenasserira. 



a. All tlie teeth in row serrate < . ■ /^ * m • tth 



[ mairangensis, G.-A. . Xnasi H1II3. 



a'. Teeth not serrate, centraX { minuta,Gr.- A Khasi Hills. 



unicuspid \hosei, Gr.-K Borneo. 



a". Teeth not serrate, central 



tricuspid kkasiaea, G.-A Khasi Hills. 



B. Without an amatorial organ. 



b. All the teeth serrate assa^nica, G.-A Assam. 



J, /-I , ] . ■ -J . , ( Christiana, Theoh. ... Andamans. 



. Centrals bicuspid, marffinal ' -, , r • n * 0.1 t j • 



, ^ ' I aekha7iensi.% Gr.-A. ... bouthern Jndia. 



[ levidensis, G.-A Southern India. 



0. Amatorial organ with calcareous dart. 



c. Teeth not serrate, central tri- 



cuspid Damayantia smithi . Borneo. 



D. Aviatorial organ ? 



d. Central teeth large, as in Ma- 1 r« ^o 7 • ci 1 t 1 j 



a-ochlamys, marginal serrate. } ^- ^ ««^^«««s*s Sumba Island. 



On Plate LXXIX. fig. 10 I give a drawing of malformation in 

 the overhanging lobe at the extremity of the foot of a specimen of 



