1884.] 'lightning' AND 'PORCUPINk' EXPEDITIONS, 139 



L^lo. ScALARiA Acus, Watson. (Plate X. fig. 8.) 



S. acus, Wats, in Journ. Linn. Soc. (Zoology), 1883, vol. xvi. 

 p. 608 



' Poieiipine ' Exp. 1870: Atl. St. 16, 17, 31-34. 



Distribution. Sicily (Monterosato), west of Azores and Culebra I. 

 ('Challenger' Exp.) ('Talisman' Exp. 1883); 49-1254 fras. 



Fossil. Pliocene : Ficarazzi {Monterosato). 



Every specimen of this pretty little shell which I have seen is 

 spirally or transversely striated, a character unnoticed in Mr. 

 Watson's description. In one of the ' Challenger ' specimens from 

 the Azores, fine spiral striae are perceptible only in the interstices of 

 the ribs ; but in the fragment from Culebra Island, as well as in 

 the perfect specimen now figured and the fragments from the 

 'Porcupine ' Expedition, these striae are stronger and cross the 

 ribs. All the specimens have a basal ridge and a similar apex. 



i/ 16. ScALARiA tenera', Jeffreys. (Plate X. fig. 9.) 



Shell inclined to cylindrical, thin, semitransparent, and glossy : 

 sculpture, numerous slight, curved or somewhat flexuous, and 

 rounded but not prominent ribs, of which there are from 2.5-30 on 

 the penultimate whorl, those on the last whorl being indistinct or 

 wanting ; the ribs are more sharp on the upper whorls ; all are 

 crossed by a few delicate and also rounded spiral strige, which are 

 more conspicuous at the base of each whorl : colour whitish : spire 

 slender and gradually tapering : whorls 10-12, convex : suture deep : 

 mouth more round than oval, obtuse-angled at the upper corner : 

 outer lip thin, expanded at the base: inner lip reflected on the 

 pillar and forming with the outer lip a continuous peristome ; behind 

 it is a small umbilical chiuk. L. 0-.5 (circa). B. 0-1.5. 

 _ 'Porcupine' Exp. 18/0: Atl. St. 16. Four fragmentary or 

 imperfect specimens only, but sufficiently characteristic for description 



and figuring. 



17. Scalaria coartata ', Jeffreys. 



S. obtusicostata, G. O. Sars, Moll. arct. Norv. p. 194, t. 22. 

 f. 9, a, 5. 



S. varicose, id. I. c. p. 348, t. 34, f. 9, a-c. 



' Porcupine' Exp, 1870 : Atl. St. 16. An imperfect specimen 



Dtstributwn. Yadsd and Moldci ((?. 0. Sars); 100-150 fms. 



Having lately, through the accustomed courtesy of the eminent 

 Norwegian Professor, had an opportunity of re-examinino- his two 

 specimens which he had described and figured as S. oblusicosfata 

 and S. varicosa on my authority, and having carefully compared 

 them with each other as well as with Searles Wood's and Brocchi's 

 types of the above-named species, I am now convinced that I was 

 mistaken in suggesting the identification of the Norwco^ian with 

 those iossil species and that both his specimens belong to^'one and 

 the same species. He quite agrees with me in the latter determina- 

 tion, as well as in adopting the name which I have ventured to 

 ' Delicate. 2 Contracted or uarrowed. 



