1891.] LAND-SHELLS FROM BORNEO. 25 



Nanina glutinosa, v. Martens, Preuss. Exped. Ost-Asien, Land- 

 schneck. p. 214 (1867). 



Macrochlamys glutinosa, Wallace, P. Z. S. 1865, p. 405. 



Nanina (Xesta) glutinosa, Issel, Ann. Mus. Civ. Geneva, vi. 

 p. 392 (1874). 



Hob. Niah Hills {A. Everett). 



Mr. Ererett collected a fine set of this species, which has a very 

 conspicuous canaliculate groove above the keel of the shell, and this 

 on the upper whorls produces a raised beading at the suture. In 

 the same locality he obtained a beautiful dark madder-brown 

 variety, similar in coloration to X. deerespignyi, which retains 

 exactly the form of the typical shell, and is not separable by any 

 other character. I would designate this as var. rubra. 



Shell-lobes (Plate \. fig. 6, r.s.l. and l.s.l.) as in Macrochlamys ; 

 the right dorsal lobe (r.d I.) large; the left differs from above and 

 is divided in two parts, of which the anterior is narrow and long, 

 the posterior being very rudimentary. Situated between, there is 

 a very well-defined long tongue-Uke shell-lobe. The living shell 

 must be very prettily mottled, as the black-spotted integuments of 

 the respiratory sac would show through the glassy thin shell. 



Mucous gland with an overhanging lobe, the aperture does not 

 extend down to the sole of the foot as shown in pi. xxxv. fig. 6 

 of my ' Land and Freshwater Mollusca of India.' 



Odontophore has plain, unicuspid, triangular-shaped centrals ; 

 about eighty of the outer laterals are bicuspid, and those on the side 

 of the radula are very minute : 



110 . 14 . 1 . 14 . 110 

 124 . 1 . 124. 



Jaw slightly curved on the cutting-edge, with only the slightest 

 indication of a central projection. The generative organs approach 

 nearest to Macrochlamys of the Indian Region, but variation pre- 

 sents itself in the male organ (Plate V. figs. 6 a and 6 b). It is bent 

 upon itself, the kale-sac is short and knob-like, and where the re- 

 tractor muscle is given off there is a simple bend, with no projection, 

 and doubling together of the tube and the formation of a coil as in 

 so many of the Indian genera and species. The drawings given by 

 Professor Semper of the reproductive organs of Xesta, which in- 

 clude X. citrina and X. mindanaensis, particularly of the latter, agree 

 with X. glutinosa. As regards the odontophore, it is similar to 

 that of X. citrina in the simple centrals, which I consider to be the 

 type of the genus ; it is also the type of X. mindanaensis. It may 

 be noted that the odontophores of the Indian species X. belangeri, 

 tranquebarica, and maderaspatana differ considerably in their tri- 

 cuspid form, and will, I think, prove different in other characters '. 



^ In the British Museum (Cuming Collection) is a specimen labelled from 

 the Solomon Islands (Hon. Capt. Eeppel) named H. capitanea, Pfr. (P. Z. S. 

 1854, p. 49). It is a j-oung shell, evidentlj- of X. glutinosa, and, I should say, 

 not obtained in the islands quoted. 



