1 



lo: 



The single specimen was collected at: 



Stat. 221. November 4, 1899. Lat. 6°24'S., Long. i24°39E. Depth 2798 m. Bottom: solid, 

 bluish grey mud with Foraminiferae. 



Observation. This species is no doubt nearly related to Sc. trapezoidenm n. sp. and 

 to Sc. truficatum Hoek. Under Sc. trapezoideum I give the reasons why I think it better to 

 consider them as three different species. Scalpellum triincatum Hoek was collected by the 

 "Challenger" (a single specimen also) at a depth of 2520 m., i2°8'S.L. and i45°io'E.L. and 

 therefore may also be considered as an inhabitant of the Indian Archipelago. 



26. Scalpellum trapezoideum n. sp. PI. VIII, fig. 6. 



Valves thirteen not covered by membrane. Tergum with the occludent margin straight 

 and the carinal margin distinctly divided into two parts. Carina simply and not strongly bowed 

 with the apex at the umbo; roof flat bordered by ridges; sides considerably broader in the 

 upper than in the lower part. Infra-median latus narrow with the umbo at the ape.x, hour-glass 

 shaped. Umbo of the carinal latus near the base, slightly projecting beyond the line of the 

 carina. Scales of the peduncle narrow, at some distance from one another, projecting beyond 



the surface. 



This species is represented by one specimen only. 



The c a p i t u 1 u m is broad, much less than twice as long as broad, flat in the upper, 

 thicker in the lower half; the straight occludent margin of the tergum forms an angle with the 

 occludent margin of the scutum. Valves not covered by membrane, surface showing the growth- 

 ridees, but not so distinct as the furrows. 



The s c u t u m is elongate, with the umbo at the apex. The apex is very slightly produced, 

 but cannot be said to project over the tergum. The form of the scutum is nearly the same as 

 in Sc. discolor, the lateral margin being however not so strongly convex. 



The tero-um has the shape of a trapezium: the perfectly straight occludent margin forms 

 an ano-le of about 80° with the upper part of the carinal margin, which runs nearly parallel to 

 the scutal margin. The length of this part of the carinal margin is about V4"' the whole length 

 of that margin; where it meets the much longer and slightly convex lower part of the same 

 maro-in a small excrescence is formed, just above the place where the apex of the carina 

 touches the tergum. 



The carina is simply and not strongly bowed, with the umbo at the apex. The flat roof 

 increases considerably in width from the apex to the base and is bordered by distinct ridges. 

 The sides of the carina are considerably broader at the upper extremity than in the lower part. 



The upper latus has the umbo near the apex, the scutal margin hollowed out and 

 the carinal margin very short. It is pentagonal as it has a short basal margin separating it 

 from the infra-median latus, and a rather long basal margin along the carinal latus. 



The rostral latus is cjuadrilateral with the upper and basal margins of about the 



same length. 



The infra-median latus is narrow; its shape is that of an irregular hour-glass, the 



