230 
and covered by the chitinal primordial valve. Tergum has a 
peculiar shape: its lower, greater part is basally narrowly rounded 
or almost pointed; the upper end, which is covered by the prim¬ 
ordial, chitinal plate has its longer axis perpendicular to that of the 
calcareous valve; an excavation of the scutal margin just below 
the apex gives the entire plate a characteristic, birdlike shape. — 
The scuta are slenderly triangular; the tergal margin is concave, 
forming an angle in the middle part. The primordial plate is [\ - 
shaped and placed on the apex of the scutum; the basal margin 
of the valve is convex. Ros trum is large, in length about 2 /z of 
the carina, its basal breadth even larger than that of the carina. 
The plate is recurved, in ventral aspect broadly triangular. — The 
upper latus is quadrangular and rather large, the rostral latus 
broadly triangular, about half as large as the upper latus; the 
carinal latus is smaller than the rostral latus, but of the same 
shape. 
The distinet peduncle measures between 1 /e and l /i of the 
entire length of the male; it is very broad, and almost cylindrical. 
The male has the complete organisation of a fully developed 
hermaphrodite. Six well developed pairs of bifurcated cirri are pre¬ 
sent. In cirrus I there are five segments on each ramus, the rami 
of cirri II and III have six, those of cirri IV to VI show seven 
segments each. The segments carry the usual armature: on the 
posterior side the segment distally has one pair of hairs, on the 
anterior side there are three pairs along the median line, the distal 
pair being the larger; often a single small hair appears below the 
three pairs mentioned near the base of the segment. 
Caudal appendages are present; they consist of one broad 
segment carrying two long, distal hairs of unequal size. — The 
Penis is short, and stout, about half as long as cirrus VI. 
The mandible has three teeth, and a broad, pectinate lower 
angle; the maxilla has a notch below the upper spines. 
Calantica Mortenseni is nearly related to Calantica eos Pilsbry 
and Calantica trispinosa (Hoek). In Calantica eos the scutum is 
broader and shorter, only being 2 /s of the terga; also the carina 
is shorter and more straight in Calantica eos. The outlines of the 
capitulum are rounded in Calantica Mortenseni ; in Calantica eos 
the capitulum is triangular with almost straight sides. To this may 
