. Mollusca ... margin oblique, triangularly reflected above,partly covering the perforation. Major diam. 15|, min. 14, height 7i mm. A large specimenmeasures 17 x 15^ x 8. Hah. Port Blair, in Houth Andaman. The height of the spire varies, and immature specimens appearflatter, more closely wound, and much more angulate thau shells appear to be frequently mistaken for M. stephus, butmay be distinguished by the subangulate periphery and obliqueaperture. [Animal ochraceousin spirit. Foot divided on the sole, extremityrounded; mucous gland large, with a blunt overhanging and
. Mollusca ... margin oblique, triangularly reflected above,partly covering the perforation. Major diam. 15|, min. 14, height 7i mm. A large specimenmeasures 17 x 15^ x 8. Hah. Port Blair, in Houth Andaman. The height of the spire varies, and immature specimens appearflatter, more closely wound, and much more angulate thau shells appear to be frequently mistaken for M. stephus, butmay be distinguished by the subangulate periphery and obliqueaperture. [Animal ochraceousin spirit. Foot divided on the sole, extremityrounded; mucous gland large, with a blunt overhanging and left shell-lobes are present, the latter apparently largerthan usual in the genus. In the generative organs the penis has acoiled cajcum ; a long retractor muscle given off from it. The 126 zonitid;e. epiphallus thence to the junction of the vas deferens is very long,and at the junction gives oif a long kale-sac. The amatorial organis long. The spermatheca consists of an oval sac at the end of athickened Fig. 49.—Macroclilamys end. A. Portions of the mantle-zone showing shell- and doraal lobes. X 33. B. Generative organs. Jaw. Xl8. D. Teeth of the radula. MacrocMamys heafa,. E. Teeth of the radula. X413. Jaw moderately curved, with a slight median formula: 35 . 1 . 10 . 1 . 10 . 1 . 35or 46 . 1 . 46 Central tooth rather short, with small hlunt basal cusps ; theadmedian teeth on quadrate plates, hlunt cusps low down on outermargin; the laterals are long, aculeate, and slightly curved,becoming very short on the outer margin. MACROCHTiAMYS. 127 This radiila is very different from that of typical Macrochlamys,and so is the genitalia, and if it should he common to all theAndaman species it would constitute them a good subsection. Aculeate laterals have been noticed in the following species :—M. jainiana; M. castnneo-ldbiata ; in M. tugurium the outermostteeth ; and in M. dalingensis they are nearly aculeate.] 202. Macrochlamys stephus, Bs. (Helix)
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