316 
MOLLUSCA. 
R. rubra, Adams. 
Dublin coast, Turton ; M. Malbay (Prof. W. H. Harvey) ; sent me from 
Roundstone by Mr. M‘Calla, in 1840, as found there, but as rare, about 
the roots of Algce growing on the exposed shores. In shell-sand from 
Kilkee. Among sea-weed brought from Tory Island (off the North coast 
of Donegal) by Mr. Hyndman in 1845, this species, together with JR. 
parva and JR. interrupta , was found. 
JR. interrupta, Br. Turt. 
One of the more common species around the coast, frequenting chiefly 
soft sand and ooze ; littoral and at a few fathoms. 
JR. proxima, Alder. 
This is the JR. vitrea of my report on the Fauna of Ireland ; it was con- 
sidered at that time by Mr. Alder to be so. 
M. Malbay, Prof. Harvey ; Magilligan (W. T.) ; Portmarnock (W. T.) ; 
Bundoran (Mrs. Hancock) ; Bantry Bay. 
JR. nivosa , Mont. Dublin Bay, Turt. 
JR. unifasciata, Mont. As last. 
JR. cingilla, Br. Turt., 
I have met with attached to stones in gravelly and muddy pools, between 
tide-marks, on all sides of the coast. Mr. M‘Calla, in sending me speci- 
mens from Roundstone, stated that he found it there among JKellia rubra 
on the exposed rocks, inhabited by JMJytilus incurvatus, as well as under 
stones on muddy banks. Ardmore, Mrs. Mackesy. 
Yar. rupestris, Forbes. 
Dublin coast, T. W. Warren, Esq. ; North-East coast, Mr. Hyndman 
and W. T. : not rare. 
JR. alba, Adams. (W. T., Ann. N. H., vol. v. p. 12.) 
Youghal, Miss M. Ball. 
JR. B allice, mihi. 
Elongated ; white ; apex obtuse ; 5 slightly-rounded whorls, deeply 
marked longitudinally with somewhat distant striae ; aperture ovate ; 
margin of the mouth thin ; lower portion of the first whorl spirally striated ; 
length 1^- line. 
Although of a more slender form, this species, in sculpture, &c., some- 
what resmbles Odostomia spiralis, but is a true Rissoa. 
Found at Youghal by Miss M. Ball, after whom it is named, though a 
very trivial compliment to that lady’s acquirements in different depart- 
ments of the Invertebrata of Ireland. 
JR. semistriata, Mont. 
In the Annals of Natural History, vol. v. p. 98 (1840), the following 
description was published - 
“ Rissoa tristriata, mihi. 
“ Conic ; volutions 51 ; rounded, smooth, with spiral rows of tawny 
spots ; first whorl very large ; aperture roundish oval ; umbilicus none ; 
