64 



slender setae. Legs of nearly equal length, each terminating in a very 

 slender claw and having the penultimate joint scarcely longer than the pre- 

 ceding joint; vibratory plate of the 1st pair (maxillipeds) somewhat resembling 

 in shape that of the maxillae, though of smaller size. Caudal rami narrow 

 sublinear in form, and armed on the tip with 2 thin claws, the distal of which 

 is the longer, dorsal edge with a slender seta about i the middle. 



Remarks. This genus, established by Brady in 1888, is closely allied to 

 Bairdia M'Coy, and its species were indeed formerly referred to that genus. 

 Yet, the shape of the shell is rather different in the 2 genera, and as also 

 some slight differences are found in the structural details, I think that the 

 genus ought to be supported. 2 well defined species referable to this genus 

 will be described below. 



9. Bythocypris bosquetiana (Brady). 



(PI. XXIX). 



Bairdia bosquetiana, Brady. On new or imperfectly known species of marine Ostracoda. 

 Trans. Zool. Soc. Vol. 5, p. 364, PI. LVII, figs. 5, a c, 

 Syn: Bairdia complanata, Brady. 



Bythocypris reniformis, Brady. 



Specific Characters. Female. Shell much compressed, seen laterally, oval 

 reniform in shape, greatest height in the middle and about equal to half the 

 length, dorsal margin forming a bold and quite even curve sloping rather 

 steeply to the hind corner of the shell, ventral margin distinctly sinuated in 

 the middle, anterior extremity broadly rounded, posterior much narrower and 

 exerted to an obtuse corner; seen dorsally, narrow lanceolate in outline, 

 greatest width about in the middle and scarcely attaining V 3 of the length, 

 both extremities obtusely pointed. Valves but very little pellucid, the left one 

 overlapping the right along the greater part of the dorsal face. Caudal ram] 

 comparatively slender, with the apical claws abruptly curved in the middle 

 dorsal margin provided, in addition to the slender mediate seta, with a group 

 of 2 4 very small hair-like bristles between it and the base. 



Colour pure whithe. 



Length of adult female 1.30mm. 



Male unknown. 



Remarks. This form was originally recorded in the year 1865 by Brae 

 as a species of the genus Bairdia, and was subsequently redescribed as tl 

 type of his genus Bythocypris, though with a different specific name, vii 

 reniformis. I am also of opinion that the form described by that author in 



group 



