328 History of British Entomostraca. 



first pair (Fig. 9,) has botli stalks divided into three articulations, the 

 external {a) has all three of nearly an equal length, whilst the in- 

 ternal (b) has the first articulation nearly as long as all the three 

 of the external together, but the two last are short and inclined out- 

 wards. The three other pairs (Fig. 10,) have the internal stalk 

 shorter than the external ; both consist of three joints, though Ju- 

 rine says the external has five : the last pair are the longest of all. 

 The fulcra or supports (Fig. 11,) are situate under fifth segment, and 

 consist each of a broad flat body, from one side of which issues an 

 appendage or kind of finger furnished with several hairs, the oppo- 

 site side being rounded, and also giving off a number of setae. In the 

 same place in the male are situate the organs of generation. At the 

 base of sixth ring in female are the openings of the canalis deferens, 

 and under sixth and seventh segments the adults of same sex carry 

 a very singular, horny looking, club-shaped organ, which is fastened 

 to the body by a narrow elongated stalk. It is somewhat curved 

 and directed backwards, its colour almost always more or less red. 

 This organ is not found in the young female, till after she has se- 

 veral times laid eggs. Its hardness is greater than that of the shell 

 of the animal ; its use is not known. Jurine has seen two in one fe- 

 male, one red, the other black. In copulation, the male of this spe- 

 cies lays hold of the terminating segment of the tail just above the 

 commencement of the long filaments which issue from it, as repre- 

 sented by Muller in his plate of this species. 



B. Marine Species, 

 4. Cyclops chelifer, Plate IX. Fig. 15-22. Specific Character Antennis 



brevibus ; capite rostrato ; manibus chelatis ; cauda biloba ; setis duobus 



longitudine corporis ; ovario unico. 



Synonimes Cyclops chelifer, Muller, p. 114. tab. xix. Fig. 1 — 3. 



Cyclops Johnstoni, Baird, Transactions of Berwickshire Naturalists' Club, 



p. 97. plate 2. fig. 4. 

 Habitat. Sea shore of Berwickshire, as at Cockburnspath, Berwick bay, &c. 



Description. — Body of 4, tail of 6, segments — terminating one 

 giving issue to two long, linear, finely serrated setae, fully the length 

 of the body ; upper or cephalo-thoracic segment of body beaked, 

 or having a short conical proboscis in centre. Antennae (Fig. 16) 

 short, of about 10 articulations in female — at junction of fourth with 

 fifth, is a small lateral ring in both sexes. About fifth ring in male 

 (Fig. 22) is the swelling, which is in the form of a bulla or bladder, 

 followed by the hinge-joint. Antennules (Fig. 17) of two articulations, 

 as in minutns ; the first having a shoot sent off from about its cen- 

 tre, consisting of two articulations, furnished with several setae ; the 



