GASTEROPODA. 317 



3 strisc winding round the summit of each whorl. Length H line. A 

 connecting link between It. semistriata and R. interrupta. Found at 

 Youghal by Miss M. Ball." 



The shell so described is generally believed not to differ from R. 

 semistriata, but Prof. Magillivray is inclined to regard it as distinct [Moll. 

 Aberdeen, p. 350). R. semistriata has come under my inspection in shell- 

 sand from Magilligan, Bundoran, and Kilkee. 



R. dispar, Mont., Portmarnock, Turt. C. D., 



" Has been met with, on the rocks near the Giant's Causeway." — Broicns 

 lllust., p. 16, 2nd edit. Noticed with doubt as from Bantry Bay in the 

 Fauna of Cork. 



R. Warrenii, Thompson. (Ann. N. Hist., vol. xv.) 



On my submitting this species (which I could not find described) to 

 Mr. Alder's opinion, he believed it to be new, and before returning the 

 specimens wrote descriptions and made drawings for his own guidance. 



" Shell slender ; tapering, thin, transparent yellowish-white ; with six 

 much-rounded and deeply-divided whorls, terminating in a rather fine 

 point ; the nucleus sunk in the apex. Aperture oblong oval : outer lip 

 thin, without rib ; inner lip not reflected, but having a deep umbilicus be- 

 hind it. The shell is slightly wrinkled by the lines of growth, and is 

 delicately striated spirally : the strias can only be seen with a good mag- 

 nifier, and are most distinctly observable at the base. There are also 

 some faint indications of small obsolete ribs on the middle whorls. 

 Length '2-lOths of an inch; breadth 1-1 2th." Two specimens were found 

 at Portmarnock (Dublin coast) by T. \V. Warren, Esq. A specimen from 

 Bundoran, Mrs. Hancock. 



R. Beanii, Hanley. 

 Shell-sand, deep water, entrance of Belfast Bay. 



R. alhella. Alder. 

 Portmarnock, and between tide-marks, Dalkey Island, Dublin Bay, Mr. 

 Alder. In shell-sand, collected at Bundoran, by Mrs. Hancock, in 1840. 

 Kilkee. 



R. decussata, Mont. Dublin Bay, Turt. C. D. 

 A specimen procured in Bantry Bay by Mr. Barlee, and one in Birtcr- 

 buy Bay by Mr. Jeffreys, in 1845, have been kindly sent me. 



Genus Odostomia. 

 O. pallida, Mont. Dublin Bay, Turt. C. D. 



A very few individuals of this species have been dredged in Belfast 

 Bay, and taken in the stomach of the grey mullet captured there ; under 

 stones between tide-marks. Strangford Lough, on soft sand and ooze. 



O. unidentata, Mont. Dublin Bay, Turt. C. D. 



More frequent in the shell-sand that has come under my inspection 

 than any other Odostomia. Prof. Harvey notes it as not rare at M. Mal- 

 hay. A specimen was dredged in soft sand at a de})th of from 15 to 20 

 fathoms in Strangford Lough, bv Mr. Hvndman and W. T. Mr. M'Calla 



