1884.] 'lightning' AND 'PORCUPINE ' EXPEDITIONS. 125 



p 34. Rissoa tenuisculpta (Jeffreys), Watson. 



R. tenuisculpta, Wats, in Proc. Zool. Soc. 1873, p. 369, pi. xxxvi. 

 f. 28. 



'Porcupine' Exp. 1870: Atl. St. 9, 16, 17a, 26, 36; Med. 53, 

 Adventure Bank. One of the specimens has the middle whorl 

 keeled or angular. 



Distribution. Bay of Biscay (de Folin and ' Travailleur ' Exp.), 

 Mediterranean (Italian Exp.), Madeira (McAndreu) and Watson), 

 off Culcbra I. and Ascension (' Challenger ' Exp.) ; 25-640 fms. 



The sculpture is more or less strong, and the size of the last whorl 

 and of the month is variable. In my deep-sea specimens the 

 longitudinal strise are distinct, numerous, and curved (flexuous on 

 the last whorl), but they do not extend below the periphery. Mr. 

 Watson says, " Longitudinal lines of growth few, faint, hair-like." 

 From a careful comparison of many specimens with those of Rissoa 1 

 coriacea, Manzoni (Journal de Conchy liologie, 1868, pp. 166 and 

 242, pi. x. f. 6), I should be inclined to unite the two Madeiran 

 species. In such case the latter specific name would have precedence. 



l/ 35. Rissoa proxima, Alder. 



R. proxima (Alder), Forbes & Hanley, iii. p. 127, pi. lxxv. f. 7, 

 8 : B. C. iv. p. 39 ; v. p. 208, pi. lxviii. f. 3. 



'Porcupine' Exp. 1869: St. 2, 18. 1870: Atl. 10. 



Distribution. Loffoden Isles to the Mediterranean ; 15-108 fms. 



Fossil. Pliocene : Coralline Crag, Siena and Palermo. 



This species was first and fully described by me in the ' Annals 

 and Magazine of Natural History ' for 1S48 (p. 16), under the name 

 of R. striatula, and that specific name has the priority of many years 

 over the late Mr. Alder's name of proxima. But in order to prevent 

 my name being confounded with that of Turbo striatulus, Linne 

 (which, however, is a species of Odostomia), I afterwards relinquished 

 my name and adopted that of Alder, by which the species is now 

 generally known to conchologists. Perhaps I was not in strictness 

 justified in doing so. 



\. 36. Rissoa vitrea, Montagu. 



Turbo vitreus, Mont. Test. Brit. p. 321, t. 12. f. 3. 

 R. vitrea, B. C. iv. p. 40 ; v. p. 208, pi. lviii. f. 4. 



'Porcupine' Exp. 1869 : St. 2, 18. 1870 : Atl. 10, Vigo B., 29, 

 30 ; Med. 50, Benzert Road. 



Distribution. Bohuslan (Malm) to the Mediterranean ; 12-249 

 fms. 



Fossil. Miocene: Transylvania (Hauer and Stache)1 Pliocene: 

 Coralline Crag and Italy. Post-tertiary : Sweden, Belfast, and Leg- 

 horn. 



Not R. vitrea of Nyst or of M. Sars. 



See B. C. iv. p. 40, as to the characters which distinguish this 

 species from R. proxima. 



