11 



ments, and generally swims by leap-like movements of 

 the abdomen, but it wears its antennes in the position 

 not as the fig V, a, plate II shows, but always in a hori- 

 zontal position. The upward curved abdomen shows an 

 obtuse angle with the cephalothorax. (Plate II, fig. 

 V, cth.) 



The Cyclops* has two pairs of antennes, (feelers) the 

 abdomen has two separated, brush -like appendages, (setce) 

 one eye formed like an x, (the eye is drawn a little too 

 wide on the figure) which is placed on the middle of the 

 cephalothorax, the colorless blood is moved by the 

 movements of the intestine ; the females are furnished 

 during the whole year, except immediately after shed- 

 ding, with an egg-bag, fastened on each side of the ab- 

 domen. (Genital-segment.) 



The Cypeis (0,7 to 1,8 Mm. in length), of the order 

 Ostracoda is greyish- brown, with two oval shields 

 fastened together with a ligament on the back. This 

 crustacean generally seeks the sediment of the water, 

 and may be found always there. This creature has a 

 single eye, (pigmented) which may be seen through its 

 transparent, brown shields, placed on the forepart of its 

 body.f The wood-cut represents a larva of the crusta- 

 cean Cypris ovum, in this 

 state called Nauplius. It 

 is magnified three hundred 

 times, and the drawing is 

 made by a camera lucida 

 with Hartnack' s micr. from 

 Paris, (Claus.) A, the an~ 

 tenne of the first pair, five 

 jointed; B, the five jointed 



- — A 



B 



* Cyclops (after Cuvier to the order Lophyropoda), Navicularis, is in 

 De Kay's fauna described by Dr. Charles Pickering. This species has spiny 

 legs, etc. Scopiphora vagans, found in deep water in Lake Ontario. 



f In James De Kay's fauna of New York, is Cypris hispida figured on the 



