472 BEV. E. BOOG WATSON ON THE 



strongish wliite porcellaneous pad a little way within ; this pad 

 does not extend to the canal, the edge of which at the point is 

 very obliquely cut off from right to left. Inner lip, as mentioned 

 there is a small pad above formed by an extension of the outer 

 lip : this is continued across the body as a porcellaneous layer, 

 thinning out and disappearing on the pillar, which is cut oft' in 

 front with a long obliquity, whose edge is rounded, but hardly 

 twisted. H. 0'8. B. 27. Penultimate whorl, height 0"14. 

 Mouth, height 042, breadth 0-18. 



This is a very beautiful species in form and in sculpture. It 

 may perhaps best be compared with P. hyalina, Reeve, or with 

 Mangelia cylindrica, Reeve, or M. gracilis, Reeve, or M. fragilis, 

 Reeve, but is not very much like any of them. Its apex distinctly 

 connects it with the Defrancia group of which Daphnella* (f. auc- 

 torum nee Hinds) is a subdivision ; and I have accordingly placed 

 it here, though aware that it is not very like some of the species 

 which have been thus named. 



62. PlEUROTOMA (DaPHNELLa) ArLACOESSA, n. sp. (avAa/coets, 

 furrowed.) 



St. 188. September 10, 1874. Lat. 9° 59' S., long. 139° 42' E. 

 W. of Cape York, off the S. W. point of Papua. 28 fms. Mud. 



Shell. — High, narrow, fusiform, white ; the whorls are convexly 

 cylindrical ; the spire high, narrow, subscalar, and conical ; the 

 body-whorl is long, narrow, and conical, with a small snout ; the 

 lip has a thin crimped edge ; the sinus is small, but very well 

 defined at the extreme top of the long narrow mouth. Sculpture. 

 Longitudinals — there are on each whorl many (27 on penulti- 

 mate, about 40 on the last whorl) fine, rounded, curved threads, 

 which correspond with the old lines of growth ; they are parted 

 by minute furrows, which are rather narrower than the threads. 

 These longitudinals extend to the base, but not to the snout. 

 Spirals — the riblets are crossed by very similar spiral threads 

 which form minute knots at the crossings, and these are parted 

 by little furrows which are rather wider and less regular than the 

 longitudinal ones, and have occasionally subsidiary threadlets in 

 the middle : there are about 7 of these spirals on the penultimate 

 and about 14 on the last whorl : the sinus-area has very faint 



* Hinds, who is the author of this genus (see Zool. ' Sulphur,' p. 25), puts 

 it after Conopleura and before Mangelia, but gives no further indication of its 

 family relations. Its connexion with Defrancia is therefore with me more a 

 hope than a conviction. 



