9 8 



The carina is simply and not very strongly bowed; umbo al the apex. kont' H.it 



not increasing much in width trom the upper to the lower extremity, bordered bj distinct ridges. 



out the same width over the whole length of the carina. 



I'lic upper latus has six margins, the sent. il margin being divided into two parts, 



rather short and straight the other larger and hollowed out. The umbo is at the angle 



where these two lateral margins meet. I lx- tergal margin is straight, also the short carinal 



margin. The lateral margin is divided into two parts: a larger which is hollowed out and 



irates the valve trom the carinal latus and a much shorter part between il and the infra- 



median latus. 



Ilx- rostrum (fig. 2a) is ,m extremely small valve situated in the corner where the 

 two scuta and the two rostral latera mi 



The rostral latus is irregularly quadrangular ; the rostral and lateral margins are 

 both convex, the second is longer than the first. 



Ihe infra-median latus has the umbo near the base. The middle part is narrow 

 with the foot slightly broader and the upper part distinctly expanded. 



The carinal latus is large. The umbo is at the foot of the carina, where the carinal 

 margin forms a distinct protuberance bevond the edge of the carina. The larger part of the 

 carinal margin is above the umbo and is distinctly hollowed out, the shorter is beneath the 

 umbo and convex, h slopes into the short basal margin. The upper and lateral margins are 

 both slightly convex. 



The peduncle is very short and is covered by small and numerous calcareous scales, 

 placed in eight fairly regular longitudinal rows. Between the scales the chitin of the peduncle 

 may everywhere be seen. 



Size. The total length of the larger specimen is 10,8 mm., that of its capitulum y mm 

 The smaller one's total length is 7 mm., that of its capitulum not quite 6 mm. 



The larger specimen was found attached to a small stick or stem, the nature of which 

 is unknown to me. It was taken at: 



2il. September 25, 1899. Lat. 5°4o'.7S., Long. i2o°45'.5 E. Dcpth 1 158 m. Bottom: 

 coarsc grey mud. 



Observation. But for the shape of the carina this species would have great resemblance 

 to Sc. distinctum Hoek. The shape of the upper latus and of the carinal latus, however, is also 

 different; Sc. distinctum has, moreover, no rostrum etc. From Sc. candidum n. sp. to which it 

 is similar in other regard s it can easily be distinguished by the shape of its carinal latus. 



23. Scalpellum arcudtum n. sp. PI. VIII. fig. 3 and 3a. 



Valves fourteen. Carina simply and feebly bowed, with a flat roof bordered by ridges. 

 Upper latus large with a short carinal and long, irregularly bowed scutal margin. Rostrum very 

 small, triangular. Infra-median latus narrow, with the umbo at the apex. Carinal latus with the 

 umbo not far from the base. 



This true deep-sea form is represented by one specimen only. 



98 



