some Species of Tenasserim Mollusca. 95 



has a still thicker horny operculum, with a very prominent 

 umbo internally, can it be said to answer Pfeiffer's generic de- 

 scription of " membranaceous." 



The animal was easily revived in two specimens with the 

 operculum received from Capt. Haughton, and began at ouce to 

 move about freely and fearlessly. No organ corresponding with 

 the slits at the upper or lower part of the aperture can be 

 detected. 



Otopoma clausum, Sow. 



A description of the animal, with its singular double sole, 

 has been given in the paper on Hybocystis. The operculum is 

 normal. It may be observed that, unlike Hybocystis, Pupina, 

 and Rhaphaulus, the eyes are situated on the side of the tenta- 

 cula, as it were on the upper end of a short pedicle, soldered to 

 and forming one with the tentaculum, much in the same manner 

 as in the genus Paludina. 



It is also worthy of remark that, by holding Rhaphaulus Chry- 

 salis and Otopoma clausum for a few minutes in the hand, and 

 thereby imparting warmth to the animals, they were induced to 

 come out and exhibit themselves. The latter shell had been 

 shut up for a year, and had left Kattiwar eighteen months pre- 

 viously. During several days it had scarcely ventured to do 

 more than raise the operculum, so as to expose a portion of 

 the foot. Rhaphaulus was so timid, that on being stirred, or 

 even examined through a lens, it shut itself up, but came out 

 boldly when held for a short time between the fingers, and, on 

 being set down, commenced creeping about. The absence of 

 sufficient warmth has apparently much to do with the shyness 

 observable in some cases. 



Helix Achatina, Grajr. 



Five specimens, taken near Moulmein by Capt. R. H. Sankey, 

 in January, were found to be living. 



The sole is oblong, rounded at each end, and pallid. The 

 head, neck, and tentacula are blackish ; the upper pair of tenta- 

 cula loug and slender towards the ocular points, the lower ones 

 very short. There is no mucous pore near the hinder extremity. 



The animal, as remarked in a previous paper, is probably 

 ovoviviparous, two young and active specimens, with 3| whorls, 

 having been produced, one of them four, the other seven days 

 after the parents had been revived. 



Helix pyldica, B. 



Three living specimens, taken by Capt. Sankey, were examined. 

 The foot is long and narrow (20 millimetres by 2) ; the upper 



