RECENT BRITISH OSTRACODA. 



431 



males, as has been shown to he the case in some Crustacea. A curious roughly punct at 

 and small form, which I suppose to he referable to a variety or stage of growth of tin 

 species, is represented at Plate XXV. figs. 49, 50. 



2. Euctthere Argtjs (G. 0. Sars). (Plate XXVII. figs. 49-51.) 



Cytheropsis Argus, Sars, loc. cit. p. 58. 



Scandinavian type (?) . Distribution: Recent — Norway, Great Britain, and Ireland. Fossil — Glacial, 

 Scotland and Norway. 



Valves of the female, as seen from the side, subovate, highest in the middle; height 

 equal to more than half the length. Anterior margin rounded, posterior rather nan wer 

 and obliquely rounded; superior margin highest in the middle, thence sloping with a 

 gentle curve towards each extremity, but more steeply backwards ; inferior slightly sinu- 

 ated in front of the middle. Outline, as seen from above, ovate, widest behind 1 he middle, 

 greatest width equal to half the length; obtusely pointed in front, rounded behind. 

 Shell pellucid, thickly set with rounded white papillae, which are very much larger than 

 those of the preceding species. " Second joint of the upper antennae about equal to t be 

 united length of the following three, last joint short, ending in a strong spin.- and hv 



->"" va ""^ *""■""■•■-"& 



seta3 ; lower antenna? short and thick, last joint larger than usual, and armed 

 with two claws, of which the internal is the smaller, the external strong and armed on 

 the anterior margin, towards the apex, with six teeth. Internal segment of the first 

 maxillae forming a simple spine. Feet very short, terminal claw scarcely longer than 

 the united length of the two last joints." 



Length -A- in. 



rj"" 4 5 



Hab. In shell-sand, Galway Bay {Prof. Rowney) ; Girdler Sand (Mr 



{Mr 



My collection contains only two or three specimens (one a female the others ma 

 from the three first-named localities ; but Mr. Robertson obtained a fine series trom 

 Shetland dredging, off the Isle of Papa. 



Genus 5. Ilyobates, G. 0. Sar 



Val.es thin and pellucid, Novate, ^^^^^^^ 

 very small distant papilla. Hinge-joint simple, formed dj a g y j 

 left valve, which is received into a corresponding depression o the ngh Uppe — 



very stout, pointed, the first two ^"^^— "- 

 l>eann long curved spines; lower antonn^ four-joxntecL ^^ 



sually long slender teeth ; palp three-jomtcd, the ecoml jo _ ^^ ^ ^ ^ 

 appendage having two long ciliated set* and one rudnnenta ,j_ four . jointo ,. 



W Feet very short; the first two pairs tlW«-JJ ,.^1 d, terminal -,:„ 

 %ht foot of the last pair, in the male, ^^^XS thc posta Mo m inal 

 **y large and strong. Abdomen of the female very convex above, I 



'obes bearing two short hairs." Eyes wanting. _ 



<c 



