79 



only 2 such spines; apical spine of inner ramus in 1st pair not particularly 

 strong; those in 4th pair very unequal, the inner one more than twice as long 

 .-is the outer and equalling in length the 2 outer joints of the ramus combined. 

 Last pair of legs imperfectly developed, and replaced on each side by 3 strong 

 ciliated, spines attached to the lateral corners of the corresponding ^ segment, the 

 outermost spine being somewhat thinner and less densely ciliated than the other 2. 

 Ovisacs of moderate size, oblong oval in form and generally closely appressed 

 to the sides of the tail. Ovarial tubes extending backwards more or less far within 

 the tail, generally to the penultimate segment. Seminal receptacle short and 

 broad, occupying almost the whole width of the genital segment. 



Colour generally dark reddish brown, with the 1st free trunk-segment 

 somewhat lighter. 



Length of adult female about 1.10 mm. 



Remarks. This very characteristic form was first recorded by Koch, 

 who has given a very recognisable figure of an adult female specimen. It. was 

 subsequently redescribed by Fischer as a new species under the name C. can- 

 thocarpoides, a name that was also adopted by some of the subsequent authors. 

 According to Dr. Schmeil, the Cyclops lascirus of Poggenpol is also identical 

 with the present species. 



Occurrence. I have found this form occasionally in stagnant pools near 

 Christiania, especially in such as have their surface more or less densely 

 covered with Lemma. Like the other species of the present genus, it is a true 

 bottom form, keeping constantly close to the ground, along which it moves with 

 great rapidity. Even when out of the water, it has the power for some time 

 of creeping along a plane surface. The manner in which the male gets 

 hold of the female during copulation, is rather different from that observed in 

 most other Cyclopida?, and more resembles that generally found in the Harpac- 

 ticoida. As in the latter, the male grasps the female with his prehensile anterior 

 antennae dorsally across the tail, and the hold is so firm that it not infrequently 

 happen that the two sexes remain tied together in this manner after being killed 

 in alcohol. 



Distribution. Throughout Europe, Turkestan (H. Ganin), North America 

 (Herrich), Australia (G. 0. Sars). 



