1884. J ' lightning' AND ' PORCUPINE ' EXPEDITIONS. 135 



and g;lossy : colour pale yellowish-white: spire short, abruptly 

 tapering ; apex pointed : whurh 7-8, convex ; the last equals two 

 thirds of the shell when placed in a supine position, and more than 

 one third of the spire when tiie shell is placed with the mouth 

 downwards : suture deep : mouth nearly round, slightly angular at 

 the upper corner : outer and inner lips somewhat expanded ; peri- 

 stome continuous ; there is a small umbilical chink between the 

 inner lip and the pillar. L. 01.5. B. 0'075. 



'Porcupine' Exp. 1870: Atl. St. 9, l(i, 17, 17f/, Setubal B., 26 ; 

 Med. Adventure Bank. 



Distribution. Bay of Biscay (' Travail) eur ' Exp. 1881); 10'J3 

 fms. 



Fossil. Pliocene : Messina {Seguema) ! 



I have compared this little species with the young of all the 

 known species from the North Atlantic and the Mediterranean, and 

 I am satisfied that it is distinct. 



\^ 8. ScALARiA SEMiDisjUNCTA^ Jeffreys. (Plate X. fig. 7.) 



Shell corkscrew-shaped or forming a twisted cylinder, thin, 

 semitransparent, and rather glossy : sculpture, numerous and close- 

 set flexuous and sharp lamellar ribs, of which there are about 20 

 on the body-whorl ; the first 3 or 4 whorls are smooth and regular ; 

 the ribs as well as their interstices are crossed by equally numerous, 

 but very fine spiral strise : colour pale yellowish-white : spire elon- 

 gated or drawn out, and gradually tapering ; apex conical and 

 mammiljar ; ivhorls 7-8, convex, angular, and spinous (muricei) at 

 tiie top of each ; the last nearly equals one half of the shell when 

 placed on its back, and between one third and one fourth of the 

 spire in a reversed position : suture deeply excavated : mouth cir- 

 cular, with a slight angularity at the up])er corner : outer and inner 

 lips thin-edged, the latter being expanded, and folded back on the 

 pillar ; peristome continuous or complete ; no umbilical chink. 

 L. 0-5. B. 0-5. 



'Porcupine' Exp. 1870: Atl. St. 16, 17, I7a. Three specimens 

 of different sizes, and fragments of four other specimens. 



Distribution. Azores ("' Tahsman' Exp. 1883); 2199 fms. 



This very remarkable species has many of the characters belong- 

 ing to tlie last species ; but I do not think it can be a monstrous 

 form of S. nana, because (in addition to other characters which may 

 be observed by com[>aring the descriptions of both species) so many 

 similar specimens and fragments of the present s])ecies occurred 

 with the other species in the extraordinary haul off the coast of 

 Portugal, which I noticed in my report of the second ' Porcupine' 

 Expedition of 1870. See the ' Proceedings of the Royal Society' 

 for that year, pages 155 and 156. 



5. disjimcta of Brown from Castellarquato is described as having 

 the last whorl furnished with a convex keel on the base. 



^ Half-disjoined. 



