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



the whole surface is scored with fine hair-like lines of growth. Spirals — there are feeble 

 rounded distant threads which do not extend to the sinus-area ; the broad flat intervals 

 have much finer threads, generally one or two ; on the snout the threads are all alike and 

 somewhat closer than above. The upper whorls are right-angled at the shoulder, but the 

 keel becomes obsolete on the body-whorl. Colour white. Spire rather high, conical, 

 scalar, sharp. Apex consists of 3^ very small turbinate whorls, of which the extreme tip is 

 immersed and tabulate ; they are chestnut-coloured, and are scored with excessively fine 

 threadlets, which are straight and longitudinal above but cancellate on the lower part of 

 the whorls; the last of these embryonic whorls ends with a deeply sinuated outer lip. 

 Whorls 5^, in addition to those of the apex ; they increase rapidly in width more than in 

 height ; above they have a flat shoulder, below which they are bluntly angled, and from 

 this point they are shortly cylindrically convex ; the last whorl is broad and short, with a 

 round but rapidly contracted base, which runs out into a very small, short, straight, lop- 

 sided snout. Suture horizontal, lapping up on the superior whorl and only distinct from 

 the angle at which the whorls meet. Mouth short and pear-shaped, angled above and 

 channelled below. Outer lip very thin ; it has a wide U-shaped sinus lying close up to 

 the suture, from which it is separated by a very minute shelf ; below the sinus the edge 

 sweeps prodigiously forward and then runs straight down the snout. H. 0'55 in. B. 0"30. 

 Penultimate whorl, height 0"1. Mouth, height 031, breadth - 17. 



This species in general character resembles Clathurella formosa, Jeffr., but is very much larger, 

 has a much larger and more prominent shoulder to the whorls, and a blunt instead of a sharp 

 apex. 



16. Clathurella homaotata, 1 n. sp. (PL XXVI. fig. 12). 



Station 106. August 25, 1874. Lat. 1° 47' N., long. 24° 26' W. Mid-Atlantic. 

 1850 fathoms. Globigerina ooze. Bottom temperature 36 0, 6. 



Shell. — Thin, delicate, pale chestnut, angulated, feebly plicate, spiralled, subscalar, with 

 a high conical spire, chestnut-tipped, suture distinct, a tumid body-whorl, a short rounded 

 base, and a broad, triangular, lop-sided snout. Sculpture: Longitudinals — the whole 

 surface is scored with fine unequal hair-like lines of growth, of which on the shoulder at 

 about equal distances one is plicated ; on the upper whorls these folds form short, very 

 oblique, feeble riblets (there are about 25 on the penultimate whorl), while on the body- 

 whorl these are very obsolete but more numerous. Spirals — in the sinus-area there are 

 very faint traces of dense spiral texture ; just above the shoulder two or three small 

 close-set furrows appear, and from the shoulder down to the point of the shell the surface 

 is scored with shallow, crimped, rounded little furrows, which are much narrower than 



1 6/ioioTa.Toi, very like, so called from its resemblance to Clathurella chariessa, "Wats. 



