156 TWELFTH ANNUAL REPORT, 



Antennae 12-jointed. 



I. — Fifth Foot 2-jointed. 



-A. — Terminal segment of fifth foot with a seta and a small spine. 



Sp. 21. Cyclops capillatus, Sars. 



"Cephalothorax sub-ovate; anteriorly uniformly rounded; seg- 

 ments projecting somewhat laterally, the last being scarcely wider 

 than the first abdominal segment. Abdomen attenuated posteriorly; 

 caudal rami almost as long as the last three abdominal segments, 

 hardly divergent, the external and internal apical setse short and 

 nearly equal; the interior of the median setae as long as the abdo- 

 men; lateral seta about in the middle of the stylet. Antennae of 

 the first pair robust, slightly exceeding the first segment of the 

 body when reflexed, v/ith the twelve joints densely covered with long 

 and divergent hairs. The last joint of the outer rami of swimming 

 feet are elongated and armed externally with three spines, internally 

 with four setae; the interior apical spine of the interior rami of the 

 fourth pair of feet longer than the exterior. Feet of the fifth pair 

 large, with a large and thick basal segment and a small oval second 

 joint bearing one long seta and a short spine. Ova-sacs small, nar- 

 row and divergent. Eye very small. Length nearly 2 mm." 



Very close to C. viridis in many points. Found only in Scan- 

 dinavia. 



Sp. 22. Cyclops crassicaudis, Sars. 



Cephalothorax elongate-ovate; segments produced laterally, espe- 

 cially the last, which extends into a somewhat procurved process. 

 Abdomen short and thick, first segment somewhat excavated; caudal 

 rami equalling the la it two segments of the abdomen. External 

 apical seta longer than the internal, both short; median setae long. 

 Antennae of the first pair 12-jointed, scarcely longer than the first 

 segment. Swimming feet short and thick, spines and setae short; 

 the interior apical spine of the last joint of the inner ramus of the 

 fourth foot almost twice as long as the exterior spine. Terminal 

 joint of the fifth foot small, armed with a spine and a seta; seta of 

 the basal segment short. Ova-sacs oval, somewhat divergent. 

 Length 0.75 mm. 



Found only in Scandinavia. 



