14 Proceedings of the Royal Irish Acadejny. 



E. GuERiNi, Eecluz. (= R. costulata, Alder). 



[Station II.] Log 35. 

 ZiPPOKA MEirBKANACEA, J. Adams, sp. {T^irho), yar. labtasa, Montagu. 

 Logs [33], 35, 41, 63. Jeffreys very unfortunately applied 

 Adams' name menibranacea to the form -which Montagu recog- 

 nized as a well-marked variety and named laliosa. Equally 

 unfortunate, too, was his use of Philippi's name elata for 

 Adams' type ; the true elata is wholly unlike any of our 

 British varieties. 



Peksephona violacea, Desmarets, sp. {Rissoa). 



Stations YI., [YIII.]. Logs 35, 50, 63. A very few dead 

 specimens. 

 Alvania Test^, Aradas and Maggiore, sp. (Rissoa) : var. abyssicola, 

 Forbes, var. 



Station YIL Logs 9, 11, 17, 18, 21, 28, 30, 33, 42, 55, 59 ; 

 depth, 30-808 fathoms. Little variation is exhibited by any of 

 the numerous specimens, most of which are wholly white and 

 uncoloured. There is, of course, a small form associated with 

 those of ordinary size. This, however, seems of so constant 

 occurrence amongst the Eissoidse, that it cannot be considered 

 as a true variation. 



A. cniicoiDES, Forbes, sp. {Rissoa). 



Logs 31, 33 ; depth, 391-90 fathoms. 



A. EETiCTJLATA, Moutagu, sp. {Turho). 



stations [II., III., YI.], YIII., [XL]. Logs 30, [33], 34, 

 50, A. 

 Var. CALATHTJS, Forbes and Hanley. 



Log 33. I fully endorse the statement made by Jeffreys, in 

 his " Eritish Conchology," that R. calathus is probably only a 

 variety of R. reticidata. It is hopeless to attempt to separate 

 specimens if only a sufficient number are examined. 



A. PTjNCTiJEA, Montagu, sp. {Turho). 



Logs 6, 9, 11, 12, 15, 19, 22, 28, 31, 33, 35, 40, 42, 50, 53, 

 55, 62, 63, 70, C, E ; depth, 0-79 fathoms. A few specimens 

 exhibiting a varicose rib were noticed. Such specimens seem 

 to be unworthy of recognition as distinct varieties, for they 

 occur with approximately equal frequency at the most widely 

 separated localities. It merely seems to indicate that amongst 

 the RissoidcB a further growth can, when conditions are favour- 



