8o 



jjart of the scutum with a lateral lobe along the tergal margin. Tergum V-shaped. Carina 

 simply bowed with the umbo at a short distance from the apex. Upper latus irregularly penta- 

 gonal. Infra-median latus irregularly wine-glass-shaped. Rostrum small triangular. 



This species is represented by a single specimen only. 



The capitulum has an elongate oval shape, sloping gradually into the peduncle. The 

 valves are separated by chitinous interspaces, their colour is not white but )ellowish ; they are 

 covered by a thin chitinous membrane. The occludent margins of scutum and tergum form 

 too-ether a continuous arch; the ape.x of the capitulum is distinctly recurved. 



The imperfectly calcified scutum con.sists of an elongate occludent segment, which is 

 broadest at the base and a narrow tergal segment. 



The tergum consists of two segments of about the same width, the carinal segment 

 being much longer than the occludent segment. Apex pointed, distinctly recurved. 



Carina simply bowed, for Vs"'^ of its length with a flat roof bordered on each side by 

 a ridge. The remaining '/g''^ is between the umbo and the apex of the valve and is not flat 

 but bowed laterally. 



Upper latus irregularly pentagonal with the tergal margin longest and the umbo 

 pointing in the direction of the tergal segment of the scutum. 



Of the valves of the lower whorl, the triangular rostrum (fig. 8^:) is by far the 

 smalle.st, the carinal latus the largest. The latter valve has the umbo at the outer angle 

 beneath the carina. The infra-median latus is relatively large; it is wine-glass-shaped, the 

 umbo being placed below the middle and the main growth being upwards. Rostral later a 

 nearly twice as long as broad, umbo placed at the corner where scutum, rostrum and rostral 

 latus are nearest to one another. The exact shape of the valves may for the rest be judged 

 from the drawing (PI. VII, fig. 8<^). 



Peduncle with the upper end widest, slightly narrower at the base, flattened, more 

 than half as long as the capitulum. Scales large, placed transversely, not numerous, forming 

 together about 7 longitudinal rows. The scales are much nearer to one another in the upper 

 end than downwards. 



Size. The total length of the specimen was 13,7 mm., that of the capitulum alone 8,7 mm. 



The only specimen was loose — to judge from the objects taken along with it I imagine 

 that it has been attached to a shell or piece of stone. 



Com pie mental male not observed. 



The specimen was collected at : 



Stat. 45. April 6, 1899. Lat. 7° 24' S., Long. ii8°i5'.2E. Depth 794 m. Bottom: fine grey 

 mud, with some Radiolariae and Diatomeae. 



Observation. At the same Station 3 other species of Scalpellum were collected, viz. 



Sc. polymorplnini^ Sc. cJiitinosum and Sc. crinituin. 



12. Scalpellum polymorphtim. PI. VII, fig. 9 — 11. 



Valves fourteen, covered by membrane, imperfectly calcified in some of the .specimens. 

 Carina simply bowed, roof bordered on each side by a strongly developed ridge; umbo very 



So 



