RISSOA. 



43 



I observed it in the collections of MM. Susini from 

 Corsica and of M. Mace at Cannes. 



It is exceedingly agile both in creeping and swimming, 

 and spins a delicate thread of attachment. Mr. Clark 

 states that this species " is a dwarf, nearly ribless R. 

 inconspicua." The latter, however, has a much narrower 

 base, the spire is more tapering and sharp-pointed, and 

 the outer lip is furnished with a rib ; and the shell is 

 never so thin in proportion to its size, and is invariably 

 sculptured. I have carefully compared the young and 

 adult of each species, in order to satisfy myself as to their 

 distinctness. Truncatella fusca of Philippi is allied to 

 the present species. 



Sztio- ^vJ^iAo, j- 



N * 35i 22. E. FUL'GIDA*, (Adams. 



Helix fulffidus, Ad. in Tr. Linn. Soc. iii. p. 254? R. fulgida, F. & H. 

 iii. p. 128, pi. Ixxxi. f. 1, 2. 



BODY whitish, with more or less of a yellow hue, and micro- 

 scopically suffused with flake-white points : mantle not exhi- 

 biting any filament : snout short, bifid at the point : tentacles 

 cylindrical but somewhat compressed, rather short, sparingly 

 and minutely setose : eyes large in proportion, on small pro- 

 tuberances of the tentacles, at their outer bases : foot flexible, 

 usually rounded in front and bluntly pointed behind; sole 

 grooved lengthwise down the middle on the posterior half. 

 Neither Mr. Clark nor myself could detect any distinct oper- 

 cular cirrus or appendage although he says, "in some speci- 

 mens I have fancied I saw a very short blunt one." 



SHELL conic-oval, inclining to globular, rather thin, semi- 

 transparent, and glossy : sculpture none, even under the micro- 

 scope : colour pale yellow or creamy, with two reddish-brown 

 bands on the body-whorl, one narrower just below the suture, 

 and the other broader below the periphery; there is also a streak 

 of the latter colour on the base ; the penultimate whorl is mostly 

 reddish-brown: spire very short: whorls 4, tumid; the last equals 

 three-fourths of the spire, and is somewhat expanded towards 

 the mouth : suture deep : mouth nearly round : outer lip thin : 



* Shining. 



