RECENT BRITISH OSTRACODA. 



411 



20. Cythere villosa (Sars). (Plate XXIX. figs. 28-32). 



Cythereis villosa, Sars, loc. cit. p. 42. 



British type. Distribution : Recent — Great Britain and Ireland, Non , Bay of Biscay. Fossil- 

 Glacial clays and raised beaches, Scotland, Ireland, Norway. 



Carapace of the female, as seen from the side, oblong quadrangular, nearly equal 

 in height throughout ; greatest height equal to more than half the length. The anterior 

 margin is obliquely rounded; the posterior truncate, angular, and somewhat waved. 

 The dorsal margin forms a flattened arch; ventral margin straight or slightly sinuated, 

 swelling near the posterior, and sometimes also near the anterior extremity inio an 

 angular protuberance. The outline, as seen from above, is compressed oblong, its ridi 

 nearly parallel and tapering suddenly at each extremity, width equal to more than 

 one-third of the length; the contact-margins bordered by prominent ribs. End vi.w 

 ovate, narrowed above. Hinge-joints as in C. albomaculala. The surface of the shell 

 is marked with large and deep excavations, which tend to coalesce, and form, especially 

 towards the ventral and posterior borders, irregularly waved ribs and furrow 9. There is, 

 however, much variety in the amount and character of the sculpture, as well as in colour, 

 which ranges from white or yellow to a deep slaty blue. The form and proportions 

 of the carapace ai;e also very variable, though the essential characters of the species 

 are mostly well preserved. The male is much elongated, about twice as long as high. 

 Animal almost exactly similar to that of C. angulata. The second antenna has an 

 armature of three setse similar to that of C. cowcexa. 



Length -A- in. 



O u±x 4 2 



Hab 



Youghal, alive in 



Orkney (Mr. C. W. 



Shetland, Tobermory, Berwick, Isle of Skye, Plymouth, Exmoiith, 



Norman) 



{Mi 



Minch and Channel Islands {Mr. Jeffrey 



{Mr 



coast KM r. U. V. vrewen). In shell-sand from Sonth Wales, Stranraer, Gatay 1 ,y an B«md. 

 stone , dredged in Birterbuy Bay, 15 fathoms, and Northumberland eoast, off Holy Island, 4, fathom. 



TWs ! p 2e S) like C. conveso, is almost exclusively confined to the **»*™£ 



the instances of its occurrence in a living state between tide-niarks tang «-!--** 



eastern coast 



37 



„ ^ w ~_ except on the eastern coast, 



rare. It appears to be a common species in our seas -«eep 



where it is rare-in this respect, also, agreeing with C. »«» 1 



in the Glacial clays of Scotland and Norway. 



21. Cythere ? semipunctata, n. sp. (Kate XXIX. figs. 33 



D.srtta^o, : ^-Ireland, Bay of Biseay. a]> rathcr high cr in front 



Carapace of the male®, as seen from the side *. cxtr , ra itics rounded; 



than behind ; greatest height equal to more than Hat 5^^ ^^ ^^ _ 



superior margin nearly straight in front, gently cul j ; d cd inwardly, thus 



margins at their outermost edge thickened and <*«™' ^j tions of the 



formin- a shallow excavated channel round the anterior 



b 



