70 THE VOYAGE OF E.M.S. CHALLENGER. 



margin is arched, its apex recurved. The scutal margin is convex and the carinal 

 mar-in quite indistinct, the valve not being separated by a distinct margin from the side 

 of the carina. The calcified part is V-shaped, and consists of two segments, one at the 

 occludent, and one at the carinal margin of the valve. The latter is a great deal longer 

 and a little broader than the former. 



The carina has a narrow flat roof, not increasing much in width towards the base, 

 where the roof is slightly furrowed longitudinally. The sides are at angles greater than 

 90° with the roof. They are not flat but slightly convex, and wider near the upper 

 extremity. They are only indistinctly limited near the tergum and near the upper latus. 



The upper latus is quadrangular, with the basal-carinal angle truncated; hence the 

 valve is pentagonal. The valve is imperfectly calcified, and consists of two segments 

 uniting at the scutal-tergal angle. The apex is slightly produced over the scutum. 



The rostral latus is pentagonal, the umbo is seated at the rostral extremity beneath 

 the occludent margin of the scutum. The valve is medium-sized. 



The infra-median latus is elongate quadrangular; its umbo is situated near the base. 



The carinal latus is of an irregular shape. A triangular part of it penetrates between 

 the carina and the upper latus. The umbo is near the base, and projects slightly over the 

 base of the carina. The basal margin is straight, the carinal margin hollowed out. 



Length of the capitulum, 20 mm. 



The peduncle is cylindrical, and almost imperceptibly slopes into the capitulum. The 

 scales are large, and not calcified, or, perhaps, are totally covered by membrane. The 

 edges are not very prominent and their number is insignificant. 



This species was taken with Scalpellum marginatum at Station 216, February 16, 

 1875 ; lat. 2° 56' N., long. 134° 11' E.; depth, 2000 fathoms; bottom temperature, 0°-9 

 C; bottom, Globigerina ooze. 



Observations. — I could not find a complemental male at the place ordinarily inhabited 

 by it. As I had only a single specimen at my disposal, the study of the parts of its 

 mouth and of its cirri has not been undertaken. Still, this would be the only way to 

 ascertain whether or not there exists a specific difference between this species and 

 Scalpellum marginatum. 



Scalpellum intermedium, n. sp. (PL VI. fig. 13 ; PI. VIII. figs. 6-8). 



Valves thirteen, imperfectly calcified, except those of the lower whorl, all covered by 

 chitinous membrane. Carina with the umbo at the apex and a flat roof bordered on each 

 side by a distinct- ridge. Calcified portion of the upper latus only slightly hollowed out 

 and nearly triangular. Peduncle short. 



This species was dredged on two occasions. Once two specimens were taken, the 

 other time only i >ne. The tergum is distinctly V-shaped ; the upper latus, on the contrary, 

 is only slightly hollowed out at the basal margin. 



