94 Mr r W.H.Benson on the Animals of 



Rhaphaulus Chrysalis, Pfr. 



Foot oblong, rounded anteriorly, narrowed posteriorly, and 

 rounded at the extremity ; muzzle short, declivous, rounded at 

 the front, not emarginate nor lobed ; tentacula somewhat short, 

 slightly ringed, pointed at the summits and then slightly tumid, 

 colour a pale cinnabar-red ; eyes small, jet-black, situated on 

 tubercles, which are on the head, and joined to the outer base 

 of the tentacula. The foot is greyish white, the sole pale, the 

 muzzle a pale reddish buff-colour. 



The operculum, which is carried centrally on the hinder part 

 of the foot, about midway between the shell and the tail, is 

 capable of being withdrawn beyond the internal opening of the 

 sutural tube, although ordinarily closing the aperture. 



There is no organ to be seen corresponding with the internal 

 sutural tube, the animal in this respect exhibiting a similarity 

 to that of Pteroci/clos, which, as described by me in 1836, pos- 

 sesses no soft parts calculated to fill the anomalous portions of 

 the shell near the aperture. 



Operculum very thin, horny, concave externally, consisting of 

 G^ concave volutions with a varnished surface. 



For the single living specimen of this shell I am indebted to 

 Capt. It. H. Sankey, by whom it was taken in January. It 

 remained closed in its shell until the 27th of June, when it 

 began to yield slowly to the means employed to revive it, finally 

 moving about and creeping freely under an inverted glass. 



Pupina art at a, B. 



Foot oblong, the sole being somewhat truncate in front and 

 slightly angled at each side anteriorly, hinder extremity nar- 

 rowed and pointed ; muzzle declivous, entire ; tentacula short, 

 subulate, and swollen all round at the base; eyes black and 

 prominent, situated on the hinder and external part of the basal 

 swelling. 



The operculum is rather thick, horny, rounded at the thickened 

 edge, and consists of 4^-5 concave whorls divided by a raised 

 edge. The inner surface has the umbonal region a little 

 elevated. 



In my first description of the shell I stated that the operculum 

 was calcareous, with few whorls. Dr. Pfeiffer, who had the spe- 

 cimen before him, made no alteration in the description, but 

 observed that my characters were abnormal. The paucity of 

 whorls was intended to be comparative with reference to the 

 allied genus Megalomastoma. On taking out the operculum of 

 that specimen, its substance appears evidently to be horny ; but 

 neither in this species, nor in the Khasia P. imbricifera, which 



