664 Beady and Norman — Monogrcq^h of the Marine and Freshwater Ostracoda 



two-lobed, the first lobe ends in two, the second and larger in six setae; 

 beyond this lobe are two sette on the body of the limb, wliich setse appear to 

 represent the third lobe of the palp, which is present in Cypridina ; the vibratory 

 lamina is as usual. The triangular vibratory lamina of the penultimate limbs is 

 fringed with about fifteen plumose setse, uninterruptedly arranged around the 

 outer border. The vermiform last limb bears only about ten spines, six at the 

 end, and four on the sides ; at their extremity these spines are furnished with 

 4—6 pairs of spinules. The caudal laminse bear thirteen ungues, of which the 

 four last are much larger than those preceding. 



The shell of the male (PL li., fig. 9) is much smaller and lower in proportion to 

 its length than that of the female, and also less tumid. The rostrate process, as 

 usual in males of this genus, is more erect, the inferior portion being absent, and 

 consequently the antennal sinus is much more widely open. The surface of valves 

 is pitted with foveolse, as in the other sex, but the great ribs are almost entirely 

 absent. A faint trace of one remains near the antennal .sinus, and the second 

 and third rib are developed, but only on the hinder portion of the shell, while the 

 first, fourth, and fifth ribs are entirely absent. The height is somewhat less than 

 half the length. The antenuules have a large sensory seta at the hinder extremity 

 of the fourth joint, this seta is annulated, and densely ciliated on one side of its 

 swollen basal portion ; at the extremity are two very long, annulated setae, 

 which are, as usual, gei^erally reflexed uj^on the limb, and five other short setse. 

 The appendicular branch of the antennae has the first joint short, the second long, 

 and arcuated backwards, with three setae on the front margin ; the last joint 

 nearly equals the second in length, and is so bent as to impinge upon that joint; 

 on its inner face are some very minute backward-directed teeth, and at the 

 extremity two microscopic setfe ; the second seta of tlie swimming-branch is 

 separated by the interval of a long joint from the first. The mandible, as 

 appears to be universal in males of this genus, has no appearance of either the 

 "masticating" process, or the "masticating" spines. 



Fosse de Cap Breton, Bay of Biscay (Marquis de Foliu, 70 fathoms, and A. 

 M. N., 1880, in 35-65 fathoms) ; Messina, 10-12 fathoms (G. 0. Sars). 



Genus 4. Streptoleberis, G. S. Brady, 1890. 



(Brady, " Ostracoda collected in the South Sea Islands." — Trans. Roy. Soc, 



Edinburgh, vol. xxxv., p. 515.) 



Shell, seen from the side, elongated, flexuous, somewhat S-shaped ; rostrate 

 pi'ocess much produced forwards, the notch being on the ventral aspect of the 

 shell ; posterior extremity narrower, produced into a pointed terminal beak, 

 directed backwards. Animal unknown. 



