142 THE VOYAGE OF H.M.S. CHALLENGER. 



6. Scalaria verrnetiformis, n. sp. (PI. IX. fig. '6). 



Station 122. September 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off Pernambuco. 

 350 fathoms. Keel mud. 



Shell. — Rather small, short, thin, with few much disunited whorls, which are crossed 

 by fine thin lamellae, and are spirally scored ; the apex is small, dark, united, and 

 longitudinally ribbed; the mouth is small, oval, and sharp-edged. Sculpture: Longi- 

 tudinals — the whorls are crossed by a great many fine sinuous lamellae, which are not 

 recumbent. Spirals — there are on the whole surface very many fine rounded threads, 

 parted by flat intervals of double their breadth ; these threads are just traceable on 

 the longitudinal lamellae. Colour transparent white, not glossy. Spire rather short, 

 conical. Apex consists of four turbinately conical, brown, rounded, closely and finely 

 longitudinally ribbed whorls, of which the last has a fine thread encompassing its base. 

 WJiorls nearly four besides those of the embryo, round, and of very rapid increase ; the 

 last three are completely and increasingly parted from one another. Suture very deep 

 in the short space where, below the embryo, the whorls are united. Mouth oval and 

 small. Lip very thin all round, patulous on the base. H. - 2 in. B. 0'09. Mouth, 

 height 0-059, breadth 0-051. 



This curious little species resembles the young of some species of Vermetus, and hence its name. 

 It slightly recalls Scalaria hyalina, Sow., from Luzon, but- the coarse ribs of that shell with their 

 highly polished interstices are very unlike. It is evidently closely connected with Scalaria scmidis- 

 juiicta, Jeffr. (see Proc. Zool. Soc. Lond., 1844, p. 135, pi. x. fig. 7). 



7. Scalaria philtata, 1 n. sp. (PI. IX. fig. 5). 



Station 135c. October 17, 1873. Lat. 37° 25' 30" S., long. 12° 28' 30" W. 

 Nightingale Island, Tristan da Cunha. 100 to 150 fathoms. 



Shell. — Small, thin, delicate, rather broad; ornamented with slightly procumbent 

 prickles and spiral threads ; the apex is small, blunt, and smooth ; the suture is deeply 

 constricted. Sculpture : Longitudinals — each whorl is crossed by about twenty-five fine 

 narrow oblique procumbent lamellae, which twist round the spire from left to right. 

 Spirals — these longitudinal lamellae are on each whorl cut across by two strong furrows in 

 the middle of the whorls, and by one 'at the top and bottom deeply impressing the 

 suture ; the effect of these is to form on each whorl three rows of compressed prominent 

 prickles ; the base is edged by a rounded faintly tubercled thread ; within this is a 

 strongish furrow, bounded on its inner side by another rounded thread which encircles 



1 fiXravoc, most beloved, by reason of its beauty. 



