RECENT BRITISH OSTRaCODA. 



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G. 0. Sars gives the following curious description of the male copulative organs. " Bj 

 a wonderful freak of nature these have the appearance, when seen from the side, of the 

 head of a hald old man. The basal portion represents the skull, the terminal portion t be 

 long beard, and the intervening parts the profile with forehead, nose, and mouth. To 

 make the resemblance more complete, some chitinous bands produce, in the prop.-r 

 position, an eye with pupil and highly elevated eyebrows. These organs present in 

 various orders of Crustacea so many variations that, by the help of a little fancy, it is 

 easy to make each species represent some particular object. But here the resemblance is 

 so exact that it must needs strike every observer." 



Genus 11. Pseudocytiiere, G. 0. Sars. 



Shell thin and pellucid, having no distinct structure, rounded in front, produced 

 behind. Hinge-joint simple. Upper antenna? bearing long seta?, 7-jointed ; second joint 

 thick and armed with a single seta on the middle of the anterior margin ; last joint ven 

 long and narrow, linear, terminating in very long setae; lower antennae v.ry slender, 

 5-jointed ; flagellum long and slender. Mandibles small, with slender, curved, uaguifcrm 

 teeth; palp narrow, 4-jointed; branchial appendage bearing long seta-. Terminal lobes 

 of the first pair of jaws narrow; branchial plate large, elongate-ovate, armed towards tin 

 base with three curved and deflexed simple setae. Feet very long and slender. Abdo- 

 men ending in a long, slender process; postabdominal lobes almost as in the preeedin 

 genus. No eye 



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Though very nearly related to the foregoing, the characters given by G. 0. Sara 

 appear to be amply sufficient to constitute Pseudocytiiere a distinct genus. The form ol 

 the carapace is, indeed, so peculiar as at once to suggest its distinctness; and ^ - - 

 also important diiferences in the structure of the antennae and mandibles, 

 member of the genus is 



T> n ^ ^ o rpinfo YYXIY fi>s 49-52, and Plate XLL 



PSEUDOCYTHERE CAV DATA, G. O. SarS. (Plate AAA1 \ . n &. *o , 



fig. 6.) 



Pseudocythere caudata, G. O. Sars, loc. ('it. p. 88. 



Carapace of the male, as seen from the side, quadrilateral, highest in front ; great,,, 

 height equal to more than half the tength. Anterior margin broad an well rounde 1 

 posterior obliquely truneate, produced above into an obtusely corneal beak 8 » 

 »argm dop J g J. somew hat sinuous ^^^ff^ZSl 

 smuated in front, terminating behind » one « Jj^j^* ,,„, nidiatin , ,,,„.. 

 ^d ventral margins form a thin flattened Ian una win ch ^ » 

 verse lines, and is most strongly developed behind 8 hell <* tne 

 tumid. Outline, as seen from above, compressed, oval, tapering ^ £*-*« £** 



are slightly mucronate ; greatest width in the middle and equal »J^££#£ 

 Shell smooth, thin, and fragile, bearing scattered shot. ^ bans ^ . J^ 



o[ the animal showing through the shell Lacd ^^^Z mu , h loD: t 

 obliquely a little in front of the middle. " Last joint of the upper 



