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



species for N. puailla 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 iV. istandica: but I have now satisfied 

 myself, by the further examination of numerous specimens from the 

 North Atlantic and Pacific oce&n?,, t\\dX N. grcenlandica is sufficiently 

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



" Natica pallida. N. testa subglobosa, albida, tenui, apice 

 breviter acuminato, eroso ; antractibus rotundatis, raargiue eleva- 

 tiusculo, sutura distincta ; umbilico parvo ; long. 1^\, lat. 1 poll. 



Hab. in Oceauo Arctico." Prom 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 Eoad, Basel Amoush, G. Tunis, Ad- 

 venture Bank (and var. alba). 



Distribution. Throughout the Mediterranean and Adriatic, Mo- 

 gador (McAndi-ew) I 



Fossil. Pliocene • Biot, Italy, and Rhodes. 



Probably If. pulchdla of Risso ; but his descriptions are very 

 insufiicient to identify any species. The present species comes near 

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

 differs only in its less oval shape and being of a larger size. 

 N. rizzcE 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, Linne. 



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. lacfea), 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 naine 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. Hanley's 



