CRUSTACEANS. 233 



shall briefly remark that it is a minute animal^ under a line in length, 

 from the tips of the antennae to the extremity of two terminating caudal 

 forking hairs. The body is composed of about nine segments, the first, 

 with the head, the largest. Of four antennae, two in front are much 

 larger than the others. A single black eye is interposed between their 

 roots. Seven pair of limbs, and some organic parts, which aid the 

 animal in swimming, run along the under portion. 



Prolific females bore a cluster of twenty or thirty spherical ova or 

 capsules, attached as an ovarium to the thorax and abdomen of two 

 specimens ; with such clusters the ovarium of one appeared at a slight 

 interval from the body on November 24, being perhaps contained in a 

 sac ; that of the other was in immediate approximation. The cluster is 

 of an ovoidal form, and yellowish colour. 



This animal inhabits fresh-water pools : it is not common. 



Plate LXII. 



Fig. 9. Cyclops stagnorum, enlarged, back. 



10. Head magnified. 



11. Prolific female ; ovarium enlarged. 



12. Another, enlarged. 



13. Ovarium magnified. 



D. — Cyclops punctatus. — Plate LXII. fig. 14. 



Tlie Cyclopean race might be partitioned into several sections, which 

 is unnecessary here, from the brevity and the nature of these incidental 

 observations. The monographers of the race have amply shewn how it 

 is to be distributed. The varieties, which are not numerous, dwell both 

 in the fresh-waters and in the sea. Belonging to the latter is the 

 Cyclops punctatus, a minute animal, extending only about a line and a 

 half The body consists of several segments. Two very long slender 

 antennae, composed of numerous articulations, and bearing several 

 bristles, originate from the head ; and interposed between the roots 



2g 



