212 
the base but become distinctly so at some distance from the tip; 
the base, which is not expanded, is subtriangular. 
The terga are lozenge-shaped and of moderate size; their main 
axis points outwards and upwards gradually from behind; the two 
sides that form the upper angle on the occludent margin of the 
capitulum are distinctly shorter than those that form the lower angle. 
The scuta are subtriangular, with a rounded or subangulate 
base; the main axis points upwards and slightly outwards from 
below and is indicated by a not very prominent vertical ridge. The 
valves are considerably smaller than the terga, which their apices 
do not overlap. 
The upper latus is triangular, but with its scutal margin 
deeply concave; its scutal and carinal are subequal, each being 
much longer than the tergal margin. The other two latera on each 
side are also triangular; they are somewhat broadly transverse, 
their apices pointing directly upwards, and do not project. The 
carinal latera do not meet over the base of the carina. 
The subcarina is narrow and not very long; it projects back- 
wards and is somewhat recurved. The rostrum is similar in form 
but is more strongly curved and considerably larger. 
Peduncle. The peduncle is shorter than the capitulum and 
siender above; it increases gradually in diameter from above down- 
wards* Its armature consists of numerous minute, bluntly pointed 
calcareous rods set in separate loculi in a thick membrane; they 
are placcd in a slanting position and do not project on the external 
surface. 
Appendages, etc. The cirri are long and curved, with thick 
fringes of long and siender hairs on the anterior margin. The 
first cirrus is far removed from the second and has its two rami 
siender, pointed and subequal. The penis is siender and contorted; 
its surface is covered with fine silky hairs. The anal appendages 
each consist of a single joint and have a narrowly conical appearance 
as viewed from the side ; they possess no long hairs or bristles. 
Mouth Parts. The buccal mass is small. The labrum is pointed 
