392 HETEROPHROSYNID A. 
Exmouth, June 26, 1853. 
It is stated in a paper of mine on the Rissoe in the ‘Annals,’ 
vol. x. p. 262, N.S., “that the R. rubra is very common alive 
in certain localities,’ and that “I have never seen the animal, 
and can scarcely believe it to be a true Rissoa, as the semi- 
testaceous operculum and its apophysis are more like those of 
a Chemnitzia.” 
This view is corroborated by the reception this day, by 
favour of Mr. Barlee, of many lively specimens, sent from 
Penzance in a bottle of sea-water by post, which has enabled 
me to take notes of all the organs. Iam not aware that this 
curious, I may almost say, anomalous species, has ever been 
mentioned, beyond a very slight notice by one or two authors, 
which in most respects is so discordant with the animal now 
presented, that one would almost think some other had been 
inadvertently observed ; perhaps a young example of the more 
tumid red-brown variety of the Rissoa ulve. I judge so, 
because authors describe their animal with very long and 
setaceous tentacula, whereas the true Rissoa rubra has those 
organs particularly short and smooth. M. Philippi’s account 
is the best, but sadly deficient in the principal peculiarities of 
the animal. I think malacologists will be glad of a somewhat 
enlarged description. 
B. rupra, Adams. 
Rissoa rubra, Adams. 
-, Brit. Moll. iii. p. 120, pl. 78. f.4, 5, & pl. 80. f. 3. 
Shell—The colour is plam red-brown, smooth or slightly 
wrinkled, of 43 to 53 tumid volutions, which form a rapidly 
increasing cone. Aperture oval, entire, contracted above, 
rounded basally ; outer margin sharp, without the callous pad 
of the Rissoe. Axis ;th, diameter ~,th of an inch. 
Animal.—The mantle is plain, even with the margin of the 
shell, and without the filament seen at the upper angle of the 
aperture in many of the Rissoe. Rostrum very short, not 
corrugated nor capable of much extension, brindled above 
with dark smoke-coloured, fine, irregular, close-set lines, 
below pale yellow; buccal disk of the same colour, of small 
