64 LAND AND FEESHAVATEK 



but, as usual, not well preserved. The spermatheca is longer than 

 in D. levicula, with the same swollen posterior termination and 

 narrow median neck. The penis is a long, gradually tapering sheath 

 as far as the retractor muscle ; there is then a short swollen portion 

 joined by the vas deferens. No amatorial organ was found in cither 

 of the two specimens examined. 



The odontophore (figs. 5, 5 a) is as in D. leincula ; the central tooth 

 was not seen. The jaw (fig. 4) is very straight in front, thin, flatly 

 convex above, rather narrow. The striate lines of themuscular attach- 

 ments form a broad arch over the central part of the cutting-edges. 



In the absence of the amatorial organ we have a most interesting 

 correspondence with what Ferdinand Stoliczka has recorded on 

 the anatomy of Comdeina =Sitala (J. A. S. B. vol. xl. pp. 23G-241, 

 pi. xviii. 1871), where he found it present in ;S'. attegia, Bs., from 

 Burmah, not so in S. infula, Bs., the Bengal or Indian form, and I 

 quoted this in Vol. I. p. 28, and, as Avill be seen further on, it is 

 absent in D. christiance of the Andamans. This I take to be 

 another indication of the close relationship of the genus Durcjella 

 and Sitala in the two areas ; for we find that D. assamica bears 

 exactly the same relationship to S. infnJa as D. levicula does in 

 Burmah and Tenasseiim to *S. attegia — modification from some older 

 and more widely distributed form having gone on in the two areas. 

 But it would not, as 8toliczka says, be expedient, on this single 

 point of structure alone, to place attegia and infuJa in different 

 genera. On the contrary, it will be more in accordance with strict 

 classification to bring iJurgelJa and Sitala together, in spite of the 

 very different and conchologically extreme form of their shells. 



Taking shell-character alone, it would have been supposed that 

 IhUcarion hensoni, from the neighbourhood of Calcutta, would 

 resemble and be included in Durgella ; such is not the case. In 

 Vol. I. Part IV. p. 150, 1 have described this species, which is widely 

 different, being of the type of MacrocJiIamys, subgenus Austenia, 



DUEGELLA MAIEANGENSIS, U. Sp. (Plate LXXVII. figS. 7-11.) 



Locahtif. Mairang, North Khasi Hills (^Gochvin-Ansten). 



Shell (figs. 7-7 f) globose, very thin, shining; sculpture none, 

 with some distant lines of growth ; colour very pale straw ; spire 

 flatly conoid, outline roiinded : suture shallow, adpressed ; whorls 3, 

 increasing evenly, rounded ; aperture oblique, widely lunate, oblique 

 on the columellar side, near the umbilicus very slightly thickened 

 and reflected. 



Size: maj. diam. 7*5, minor 6-0 ; alt. 3"75 mm. 



This shell is verv close to A. saliits, Bs., of Teria Ghat, Vol. I. 

 Pt, IV. p. 152 (PI. XXXVII. figs. 1, 1 rt, 1 h) ; it differs in form and 

 size, and particularly in the proportion of the 2 apical whorls, which 

 are much closer and smaller in a larger shell. It was taken alive 

 and the following description written at the time : — Animal pale 

 yellowish, rather more orange on toot; tentacles pale, short; a 

 dusky line on upper surface of extremity of the foot ; mucous gland 

 small, overhanging ; shell-lobes slightly reflected over edge of shell. 

 Jumps about actively when handled. Shell pale green. Length 



