MACROCHLA.MYS. 125 



200. Macrochlamys pseudochoinix, Blf. P. Z. S. 1904, ii, p. 446, 

 pi. 25, fig. 10. 



Shell subobtectly perforate, depressed, thin, smooth, slightly 

 polished, brownish horny, subobsoletely plicately striated trans- 

 versely and marked with fine, close, microscopic, slightly flexuous, 

 spiral (longitudinal) lines above and below ; spire very low, suture 

 scarcely impressed, almost flat ; whorls 5, rather flat above, the last 

 much broader, rounded at the periphery, swollen beneath; aperture 

 oblique, subdiagonal, large, subovately lunate ; peristome acute, 

 upper margin arcuate, columellar much curved, vertical above, 

 briefly reflected, partly covering the perforation. 



Major diain. 14, min. 12, height 7 mm. 



Hob. Great Cocos Island, Bay of Bengal. 



Near M. choinix, but considerably more tumid beneath, with 

 rather higher spire and much stronger spiral sculpture. The 

 aperture is much rounder, being very little broader than high, 

 7 x 7*5 mm., whilst in a specimen of M. choinix the dimensions 

 are 7 X 8*5 mm. 



201. Macrochlamys exul, Theob. (Helix) J. A. S. . 1S64, p. 245; 

 Stol. (Helix) P. A. S. B. 1870, p. 87 ; H. $ T. (Helix) C. I. 

 1876, pi. 62, figs. 1, 2, 3 ; NeviU., Hand-l. i, 1878, p. 23 ; Godwin- 

 Austen, Mol Ind. i, 1883, p. 103, pi. 22, tig. 3 (shell) ; ii, 1907, 

 p. 165, pi. Ill, figs. 2-2 d (part of animal, genitalia, & radula). 

 Orobia (Helix) andaiuanensis, Try on, Am. Jour. Conch, v, 1869-70, 

 p. 110, pi. 10, fig. 4 ; Pfr. Mon. Hel. vii, 1876, p. 108. 



Shell subobtectly perforate, conoidly depressed, smooth, not 

 highly polished, with fine, close, longitudinal striation (sometimes 

 indistinct) under the microscope, translucent, light brownish 

 horny; spire low, conoidal, sides rather convex, apex obtuse, 

 suture shallow ; whorls 6, gradually increasing, the last somewhat 

 compressed and very bluntly angulate at the periphery, convex 

 beneath: aperture oblique, lunate, almost semioval ; peristome 

 thin, columellar margin oblique, triangularly reflected above, 

 partly covering the perforation. 



Major diam. 15|, min. 14, height 7| mm. A large specimen 

 measures 17 x 15| x 8. 



Hab. Port Blair, in South Andaman. 



The height of the spire varies, and immature specimens appear 

 flatter, more closely wound, and much more angulate than adults. 

 Such shells appear to be frequently mistaken for M. steplms, but 

 may be distinguished by the subangulate periphery and oblique 

 aperture. 



[Animal ochraceous in spirit. Foot divided on the sole, extremity 

 rounded ; mucous gland large, with a blunt overhanging lobe. 

 Right and left shell-lobes are present, the latter apparently larger 

 than usual in the genus. In the generative organs the penis has a 

 coiled ctecum ; a long retractor muscle given off from it. The 



