156 



LAND AND FRBSHWATUR 



Shell (figs. 2, 2 a) depressedly globose, scarcely perforate, glassy; 

 sculpture iudistinct irregular longitudinal striae, but quite smooth 

 in places ; colour rich sienna-brown, pinkish inside the aperture ; 

 spire depressed; suture shallow; whorls 4 (not quite fully grown), 

 rather tumid and rapidly increasing ; aperture subvertical, ovate, 

 the peristome on outer margin nearly the curve of a true circle. 

 Columellar margin weak, subvertical, scarcely reflected. 



Size: maj. diam. 18-5, miu. 147 ; alt. axis G-4, alt. body- whorl 

 6'8 mm. 



Animal (Plate CV. figs. 2 b, 2 c). Has the typical shell-lobes of 

 Macrodilaviys. The specimen dissected was much contracted and 

 hardened by the alcohol, so that the mucous gland and lobe above 

 both appear small. This smallness is, however, not all due 

 to contraction. The sole of the foot is strongly divided into 

 middle and lateral areas. The peripodial groove is conspicuous and 

 the margin broad. The membrane covering the pulmonary cavity 

 (fig. 2 h) is of a dark green colour, closely speckled, and above the 

 renal organ and heart is quite black. The foot of the animal is 

 concolorous both above and below, of an olivaceous tint, darker ou 

 the head and tentacles. The specimens were evidently taken 

 in the cold season, for the generative organs were found to 

 be exceedingly small and contracted and in trying to get them 

 out were broken, yet sufficient was seen to show there was an 

 amatorial organ and the general form of the penis. This shows a 

 long kalk-sac or flagellum (fig. 2 d) and a convolution where the 

 retractor muscle is given oft'; it therefore agrees with the typical 

 form of this organ in this genus, althougli its form must be much 

 altered and swollen during the season of reproduction. 



The jaw (fig. 2 e) has a central projection. 



The radula (fig. 2/) formula is 



25 . 1 . 18 . 1 . 18 . 1 . 25 = 44 . 1 . 44 



The central tooth is rather narrow, long, tricuspid ; the admedian 

 teeth also on narrow plates, with one side cusp ; the outer teeth 

 are unevenly bicuspid. The breadth of the central portion is far 

 greater than that of both the marginal parts. 



This species, as regards its shell, may very easily be mistaken for 

 M. richilaensis at a casual glance ; it is, however, a much stronger 

 shell and not so globose. The animals are very differently coloured, 

 particularly in the distribution of colour; and there is great diversity 

 in the generative organs. 



MACEOcnLAMYs BEATA, n. sp. (Plate CVIII. figs. 1, 1 a, 1 b.) 



Locality. Shengorh Peak, Dafla Hills, GOOD ft. (Godwin-Austen). 



Shell depressedly globose, rather thin, imperforate ; sculpture 

 wavy, strong, regular longitudinal striation, crossed by distant lines 

 of growth ; colour olivaceous brown : spire low, apex rounded ; 

 suture shallow; whorls 5, gradually expanding; aperture ovate, 



