I 20 



The scales of the peduncle are very distinct, at some distance from one another and 

 placed in 8 longitudinal rows. The length of the peduncle is about half the length of the capitulum. 

 Siz-e. The total length of the animal is 7,8 mm., that of the capitulum 5,5 mm. 

 The "Siboga" took the specimen at: 



Stat. 251. December 8, 1899. Lat. 5° 28.4 N., Long. 132° 0.2 E. Depth 204m. Bottom: hard 

 coral sand. 



38. Scalpellum virgatum n. sp. PI. IX, fig. 4. 



X'alves thirteen covered with a delicate brownish membrane. Carina with the umbo at 

 the apex and with a flat roof bordered by ridges. Lateral margin of the scutum with a deep 

 triano-ular incision near the upper extremity for the reception of the apex of the upper latus. 

 Valves of the lower whorl large. Infra-median latus wine-glass shaped with the umbo near the 

 base. Carinal latus quadrilateral with the umbo near the base. 



This curious deep-sea species is represented by a single specimen only. 



The capitulum is rather flat, little more than twice as long as broad, having the 

 carinal margin slightly more convex than the occludent margin. The apex of the tergum is 

 pointed and a little recurved. The surface is of a browny yellowish colour; scratching it with 

 a needle a very delicate skin or membrane loosens in little flocks from the surface. The ridges 

 of growth are very distinct on most of the valves; parallel furrows are visible on the .scutum, 

 on the upper latus and also on the carinal latus near the base. The valves are separated from 

 each other by narrow, but distinct chitinous interspaces; that between the tergum and the upper 

 half of the carina being much broader than the others. 



The scutum has a very characteristic shape. Its occludent margin is conve.K; its tergal 

 maro-in hollowed out near the apex and convex towards the other extremit_\'. The lateral and 

 basal maro-ins slope into one another quite insensibly; near the upper extremity the lateral 

 maro-in shows a verv characteristic incision in which the apex of the upper latus fits exactly. 



The tero-um is triangular. Its occludent margin is convex, its carinal margin slightly 

 hollowed out in the upper, slightly convex in the lower part. The apex is not strongly, yet 



distinctly recurved. 



The carina has a flat roof which is bordered by ridges, but does not increase in width 

 very strongly from the apex downwards. The sides of the carina are well-developed over its 

 whole length, they increase only slightly in width from the base to the tip of the valve. 



The upper latus is pentagonal with the sides of very unequal length. The carinal 

 and the ba.sal margin along the infra-median latus are the shortest, the convex tergal margin 

 which is slichtlv hollowed out in the middle is the longest. The lateral margin is hollowed out 

 and a little longer than the basal margin separating this valve from the carinal latus. The umbo 

 is at the apex which may be called beaked. 



The rostral latus is quadrilateral; the upper and basal margins are of about equal 

 length, the rostral margin is slightly convex, the lateral margin distinctly convex. 



The infra- median latus has the shape of a wine-glass and is relatively large. Both 



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