144 ME. T. SCOTT ON ENTOMOSTEACA 



III. FLATYCOPA. 

 Pamily CITHEEELLID^, G. O. Sars. 



Genus Cttherella, JoBes (1S49). 



CrXHEBELLA AFRICANA, n. sp. (PL XV. figs. 9, 10, 36, 41, 42.) 



As seen from the side, the valves of the shell are broadly elliptical ; dorsal margin 

 flatly and somewhat unevenly rounded ; ventral margin slightly concave, extremities 

 boldly convex. Shell rather highest behind the middle ; height fully half the length. 

 Seen from above, the greatest breadth is near the posterior end, which is subtruncate ; 

 the sides are slightly curved and converge gently towards the anterior extremity, which 

 is somewhat emarginate. Surface of valves smooth. Length -86 mm. (l-29th of an inch), 



Anterior antenna? 7-jointed, setiferous, the last joint with three spines fully twice the 

 length of the joint ; the secondary branch of the posterior antennae scarcely equal in 

 length to the first joint of the larger branch; post-abdominal laminse armed on the 

 exterior margin and apex ^\•it]^ several strong divaricate spines ; inner margin with three 

 or four smaller spines, having one of the edges setose (fig. 42). 



Habitat. Loanda Harbour, in a surface tow-net gathering, collected Eebruary 13th. 

 1886. The form of the shell of this species closely resembles Cytherella scotica, Brady. 

 It differs in being scarcely so truncate behind ; seen from above, the sides of the shell 

 are more distinctly curved in outline, and the dorsal margin, seen from the side, is slightly 

 convex instead of concave. 



(?) Cytherella pumila. (PI. XV. figs. 11, 12.) 



Shell outline, seen from the side, broadly elliptical ; dorsal margin flatly convex and 

 obscurely angulated ; greatest height equal to five ninths of the length ; ventral margin 

 gently and evenly rounded; extremities also moderately convex, but the anterior end is 

 rather narrower than the other and somewhat oblique. Seen from above, ovate ; greatest 

 breadth behind the middle and equal to four ninths of the length ; sides evenly rounded ; 

 extremities subacute. Length "57 mm. 



Habitat. Loanda Harbour, in a surface tow-net gathering collected Februaiy 13th. 

 A single perfect specimen only was obtained and two valves. 



DESCRIPTION OE THE PLATES. 

 Plate I. 



Paracalanus pygmcevs (Clans?). 



Fig. 1. Female, lateral view. X 53. 



2. Anterior antenna. x 84. 



3. Posterior antenna, x 165. 



4. Posterior foot-jaw. x 170. 



Fig. 5. Foot of seeond pair, x 125. 



6. Foot of fourth pair, x 125. 



7. Foot of fifth pair. x 250. 



8. Abdomen and caudal stylets, x 125. 



