234 Records of the Indian Museum. [Vol. IX, 



and 595 fathoms, only differs from Hoek's figure in having the 

 capitulum a little broader, the carina more strongly arched, the 

 valves of the lower whorl more incomplete and the peduncular 

 plates broader. In these "incomplete" species great variation 

 must be expected, and without further material I hesitate to 

 regard the Indian form as distinct. 

 Type in the Amsterdam Museum. 



10. Scalpellum lambda, Annandale. 

 Rec. Ind. Mus. V, p. 115 {1910). 



Type No. ^-g^ Crust. Ind. Mus., from 'Investigator' station 

 372: i3°54'i5"N., 94°2'i5"E.; 643 fathoms. 



ir. Scalpellum longius, sp. nov. 



Capitulum narrowly ovoid, more than twice as high as broad, 

 bearing 13 (or 14) thin, smooth, translucent white valves, which 

 cover its surface almost completely; external membrane thin, 

 colourless, transparent, smooth. 



Carina regularly and moderately curved ; umbo subapical ; 

 sides moderately broad, distinctly concave; dorsum concave, with 

 well-defined lateral borders ; apex of valve far removed from apex 

 of capitulum. 



Tergum very large, triangular, extending for about ^ of its 

 length above the apex of the carina, sharply pointed and some- 

 what retroverted at the upper end ; occludent margin convex ; 

 lower margin straight, sloping upwards and outwards from the 

 carina ; carinal margin straight, much the longest of the three, 

 sloping upwards and outwards along the carina, with a distinct 

 tooth just above the carinal apex and distinctly sinuous beyond it. 



Scutum smaller than tergum, irregularly triangular ; apex 

 retroverted from occludent edge of capitulum, sharply pointed ; 

 occludent margin as a whole convex, vertical ; tergal margin short, 

 markedly concave, with a prominent tooth at either extremity ; 

 inner margin almost as long as occludent margin, very strongly 

 sinuous. 



Median {upper) latiis having the form of an oblique isosceles 

 triangle with each basal angle broadly, obliquely, equall}^ truncat- 

 ed, in such a way that the whole outline is pentagonal; tergal and 

 scutal margins equal, the latter slightly concave, the former slight- 

 ly convex ; carinal and lower margins equal, straight ; suture with 

 carinal latus longer than either, straight, slanting. 



Carinal latus quadrilateral, high but narrow, by no means 

 prominent behind ; inner and outer margins straight, vertical 

 subparallel ; upper margin much shorter, straight, sloping down- 

 wards from carina ; lower margin straight, sloping downwards from 

 inframedian latus ; posterior basal part meeting its fellow below 

 the base of the carina and forming a short vertical suture with it, 

 irregularly triangular, corrugated. 



