1885.] 'lightning' AND • PORCUPINE ' EXPEDITIONS. 31 



work. Reeve followed Forbes and Hanley and older British authors 

 in referring the present species to N. nitida of Donovan (a West- 

 Indian shell) ; but he described and figured under that name 

 and as our species N. guiUemini of Payraudeau. His errors of 

 nomenclature are very bewildering. 



5. Natica iNTRiCATA, Donovau. 



N. intricata, Bon. Brit. Shells, v. t. 1G7 ; Hidalgo, Moll. mar. 

 Esp. lam. 20a. f. 8-10, 9 (opt.). 



'Porcupine' Exp. 1870 : Tangier B. 



Distribution. Portugal and Azores {Mc Andrew), throughout the 

 Mediterranean and Adriatic; 2-120 fms. 



Fossil. Pliocene: Tuscany, Monte Mario, Calabria, Sicily, and 

 (?) Rhodes. Post-tertiary : Militello, in tufo balsatico {Philippi). 



This is (partly) Xerita cunrena of Linne, Natica marmorata, 

 Risso, N. valenciennesi, Payraudeau. 



6. Natica montacuti, {montagui) Forbes. 



N. montagui, Forb. Mai. Mon. p. 32, pi. ii. f. 3, 4. 



N. montacuti, B. C. iv. p. 227 ; v. p. 215, pi. Ixxviii. f. 6. 



' Lightning ' Exp.: St. .5, 6, 7. 



'Porcupine' Exp. 1869 : 1, 2, 3, 6, 9, 13, 14, 23a, 25, 36, 41, 

 47, 68, 70, 89, Little Minch. 1870: Atl. (var. minor), 3, Za, 9, 

 30 ; Med. C. de Gata, Adventure Bank. 



Distribution. Iceland, Finniark to Guernsey, Belgium (MaZ^ine) ; 

 5-570 fms. 



Fossil. Post-tertiary : Christiania and Bohusliin, Hebrides, Brid- 

 lington, Calabria, Sicily, and Rhodes. 



7. Natica notabilis', Jeffreys. (Plate IV. figs. 1, 1 a.) 



Shell globosely fusiform (being pointed at the apex and base), 

 thick, opaque, rather glossy : sculpture, none except irregular lines 

 of growth : colour yellowish-white, with three equidistant bands 

 on the body-whorl, composed of reddish-brown streaks, which are 

 close-set and obliquely arranged ; one of these bands encircles the 

 middle and is broader than the others, the upper one hes just 

 below the suture, and the third or lowermost is placed below the 

 periphery ; there is also a small blotch of the same colour above the 

 umbilical pad : spire short, but prominent and pointed : whorls 5, 

 convex, compressed at the top ; the last occupies y^^, of the spire : 

 suture slight, but distinct, not channelled : mouth semilunar, equal in 

 length to f of the spire : outer lip thin, curved but not inflected at 

 the top : inner lip narrowly sj)read on the upper part and thickened 

 at the base : umbilicus contracted by a thick but small pad, so as to 

 form a crescentic groove : operculum cliitinous, ear-shaped, horn- 

 colour, indistinctly striated in the line of growth, and having a small 

 lateral spire of three whorls, defined by an overlapping and raised 

 edge. L. 04, B. 0*35. 



^ E«martable. 



