1895.] MOLLUSCA or the ANDAMAN' AND NICOBAE ISLANDS. 447 



Generative organs. — The male organ is loug, and the amatorial 

 organ is present. 



The margin of the branchial sac from anal orifice is conspicnously 

 mottled with black and white showing through the shell. It has a 

 peculiar capreolus, or spermatophore, like M. Jainiana, Gr.-A., from 

 Parisnath, Land & Freshw. Moll. India, pi. xxviii. figs. 2 6, 2 c. 



10. Maceochlamys PSETJDArLOPSis, G.-A., Nevill MS. (p. 441). 



This is No. 108 of Nevill's ' Hand-list ' (p. 32) and described by 

 me (I. c). This name occurs on labels in Mr. de Koepstorff's 

 collection in Xevill's handwriting. 



The jaw in this species is very much curved with strong central 

 projection. It possesses the amatorial organ. 



Genus Eotula. 



1, Eotula massoni, Behn (p. 441). 



Helix massoni, Behn, Pfr. Mon. Hel. iv. p. 344 (1859). 



Rotula massoni, Semper, Eeise, p. 40, pi. iii. f. 28, pi. vii. f. 17. 



Nanina (Rotularia) massoni, Mdrch, Journ. de Conch, ser. 3, xii. 

 p. 308 (1872), et xvi. p. 354(1876). 



This shell was described from a single example. 



The animal has a small right shell-lobe and one small left shell- 

 lobe as in Macrochlamys. It is very pale in colour with black 

 tentacles. 



The odontophore is also as in MacroMamijs. 



Jaw with a central projection. 



20 to 25—12—1—12—20 to 25. 



Semper on plate vii. gives the form of the teeth exactly ; his 

 specimen was from the Museum at Kiel, ex coll. ' Galathea.' The 

 generative organs are also figured by Semper ; it has no amatorial 

 organ, and in this respect it coincides with coelatura and rufa, both 

 from Bourbon, the home of detecta, which Albers took as the type 

 of his genus Rotula. 



I am inclined to think that R. roepstorffi is only a synonym, the 

 transverse sculpture on the apical whorls would disappear in old 

 shells. 



Genus MiCEOCYSirN'A. 



3. MiCEOcYSTiNA WAENEFOEDi, Nevill MS., G.-A. (p. 441). 



This genus and species are described by me in the ' Land and 

 Freshwater Mollusca of India' (p. 33, pi. iii. f. 8). 

 Jaw very curved, central projection well developed. 



Genus Miceocystis. 



1. Miceocystis camortbnsis, Nevill MS. (p. 441). 



A specimen of this species is in the Calcutta Museum, collected 



