OOi) 



LAND AND FRESHWATER 



down the coast south of Moulmein and enlarges the area of its 

 distribution considerably. I may allude here to a record in Nevill's 

 ' Hand-list,' i. p, 52, of a single specimen of S. cccUas in the Calcutta 

 Museum, one out of Stoliczka's collection as coming from Biliug, 

 south of Pegu, which is some 75 miles north-west of Moulmein. 

 This is a single specimen, the determination may not be correct, 

 and this extension requires confirmation, particularly as Pegu is 

 in quite a different geological and separate drainage-area of the 

 Irrawaddy. 



The animal of the Mergui shell on dissection agrees in every 

 respect with Stoliczka's description, only that the generative organs 

 (Plate CXVI. fig. 3) are in a much more advanced stage of develop- 

 ment than was the case with those figured by Stoliczka (pi. xix. 

 fig. 2), which are in a very attenuate stringy state. 



I give a figure of the animal (Plate CXV. figs. 5, 5 a) removed 

 from the shell, both from the right and left side, showing the ample 

 shell-lobes and the very large and entire left shell-lobe. This shell 

 was 14*75 mm. in major diameter, and is therefore referable to the 

 variety of S. calias (schistostelis, Bs.), and show^s most beautifully the 

 second growth of the shell upon the earlier stage, and possesses a 

 different surface, but in this case is quite solid, not thinner than the 

 preceding whorls. 



Extracts from Stoliczkci's Description o/ Sophina. 



" The shells of Sophina are characterized b}' a more or less 

 thickened columellar lip, forming with the basal portion of the 

 outer lip an angle, and producing a ridge round the umbilicus ; 

 they are of small or median size, suborbieular shape, and thin 

 structure. 



" All of them (the species known) can fully retract their bodies 

 in the shells, but sometimes with difficulty, as in Helicarion, to 

 which Sophina, on account of the great development of the mantle- 

 lobes, bears a close relation. 



" The foot of S. calias is very elongated, rather narrow, with a 

 very distinct lateral line, marked with oblicjue furrows above it, 

 nearly smooth below it down to the edge of the sole. The posterior 

 end is obliquely truncate, occupied bj' a large high gland and 

 superseded by a distinct horn-like appendage. The sole has two 

 longitudinal grooves, dividing it in three subequal jiarts, the inner 

 being somewhat narrower than the outer parts ; the grooves are 

 usually well traceable in spirit-specimens, but during life they are 

 not equally easily discernible. Pedicles about half the length of 

 the body, tentacles about one-fourth the length of the pedicles, 

 both with swollen tips. Mantle conspicuously thickened near the 

 margin, its external edge very short, entire, and continuous. The 

 left shell-lobe is very large, entire, reflected over the edge of the 

 outer lip, and below considerably produced ; the right mantle-lobe 

 is divided into two parts, the upper is linguate, narrowly produced 

 and covering the base of the shell, ])artially also 'extending on to 



