228 
Calantica Mortenseni n. sp. 
10 miles N. W. of Cape Maria v. Diemen, New Zealand- 50 fathoms; hard 
bottom. 5/1 15. One specimen. 
The species is characterised by its large primary valves, which 
make a sharp contrast to the small rostrum and latera. The carina 
and scuta are of almost equal length, and only little shorter than 
the nailshaped terga. 
The carina (Fig. 2) is almost straight, only feebly, but evenly 
bowed with the apex between the edges of the terga. Seen from 
behind it is very slenderly triangular with straight sides. 
Fig. 2. Calantica Mortenseni. a. rostral, b. lateral, c. carinal aspect; d. skeleton of 
the peduncle. [a.—c. X 2, d. X 12]. 
The terga are the largest plates of the capitulum, and with 
their length of 12 mm almost quite as long as the entire capitu¬ 
lum. The plate is nail-shaped, and not very pointed at the apex; 
it has a rather short and straight occludent margin. The carinal 
margin is evenly rounded with only a very small part above the 
apex of the carina; also the scutal margin is evenly rounded, the 
angle between this latter and the occludent margin very blunt. 
The scuta are large, triangular, almost twice as high as broad, 
with a pointed apex. The length is about the same as that of the 
carina, or 5 /e of the terga. The tergal margin is feebly concave, 
the occludent margin all but straight. 
Rostrum is the most prominent among the lower row of plates, 
although its height does not reach 2,5 mm. It is broadly triang¬ 
ular, its apical part recurved. 
