30 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jan. 10, 



species for N. pusiUa of Say, which has a calcareous operculum. I 

 was at one time inclined to doubt whether N. pallida of Bruderip 

 and Sowerby might not be N. islandica: but I have now satisfied 

 myself, by the further examination of numerous specimens from the 

 North Atlantic and Pacific oceans, t\\sX N. grcenlandica is sufficiently 

 represented by their description although short, which is as follows : — 



'^Natica pallida. N. testa subglobosa, albida, teuui, apice 

 breviter acuminate, eroso ; anfractibus rotundatis, margiue eleva- 

 tiusculo, sutura distincta ; umbilico parvo ; long. IV\,, lat. I poll. 



Hab. in Oceano Arctico." From Icy Cape. 



Specimens from the arctic seas are much larger than those from 

 the Dogger Bank. 



3. Natica macilenta, Philippi. 



N. macilenta, Phil. Moll. Sic. ii. p. 140, t. xxiv. f. 14. 



' Porcupine ' Exp, 1870: Med. St. Algesiras B., Capo de Gata, 

 50, .55, Gr. Bona, Benzert Koad, Rasel Amoush, G. Tunis, Ad- 

 venture Bank (and var. alba). 



Distribution, Throughout the Mediterranean and Adriatic, Mo- 

 gador {McAndrew) I 



Fossil. Pliocene '. Biot, Italy, and Rhodes. 



Probably N. pulchella of Risso ; but his descrii»tions are very 

 insufficient to identify any species. The present species comes near 

 N. guillemini of Payraudeau, and may be a variety of it : the latter 

 diff"ers only in its less oval shape and being of a larger size. 

 N. rizzcc of Philippi appears to be a variety of his N. macilenta. 

 If all these species are the same Payraudeau's name has priority 

 over both of Philippi's species, although it is posterior to that of 

 Risso. 



4. Natica glaucina, Limie. 



N. glaucina, L. Fauna Suecica, ed. 2, p. 533, no. 2197. 



N. alderi, B. C. iv. p. 224 ; v. p. 215, pi. Ixxviii. f. 5. 



'Porcupine' Exp. 1869: St. 1, 2, 3, 12, 14, 17, 18, 23a (and 

 var. lacten), L. Swilly, L. Foyle, 33, 35, off Lerwick. 1870: Atl. 

 Vigo B., Tangier B. ; Med. Algesiras B., Benzert Road. 



Distribution. Loffoden I. to the Mediterranean and Adriatic : 

 2-310 fms. 



Fossil. Pliocene : Red Crag, Tuscany, Calabria. Post-tertiary : 

 Scandinavia, British Isles, and Messina. 



As a mere act of justice to the illustrious Swede, I feel myself 

 compelled to substitute for alderi the specific name glaucina, by 

 which he originally and undoubtedly designated and so fully de- 

 scribed this common European shell in his ' Fauna Suecica,' and 

 which he afterwards countersigned or sufficiently indicated in the 

 twelfth edition of the ' Systema Naturae.' When I was tempted to 

 adopt the name given by Professor Forbes in honour of Mr. Alder 

 (both of them my old and lost friends !), I was misled by the long 

 and perplexing discussion of the Linnean species in Mr. Hanlej's 



