RECENT BRITISH OSTRACODA. 



387 



Of this pretty little species I have seen only three specimens — ^two found amongst 

 shell-sand from Connemara by Dr. Alcock, the other dredged off the Hebrides by Mr. 

 Jeffreys. The Irish specimens were completely bleached, but that from the Minch was 

 well coloured. My drawings were taken from the former, and exhibit the lucid spots 

 very distinctly. These are not visible in the fresh specimen, Prom the colour and 

 general characters of the shell, I have no hesitation in assigning it a place under the 

 genus Fontocypris. It seems to be quite distinct from any hitherto described species. 



8. PoNTOCYPRis TRIGONELLA, G. 0. Sars. (Plate XXV. figs. 81-34, and Plate XXXVIII. 

 fig. 3.) 



Pontocypris trigonella, Sars, Oversigt af Norges marine Ostracoder, p. 16. 



British type. Distribution : Recent — Norway, Great Britain, Ireland, Mediterranean, Cape Verde. 

 Fossil — Raised beaches and glacial clays, Scotland and Ireland. 



Shell less compressed than in either of the foregoing species ; seen from the side, sub- 

 triangular, rather higher in front than behind ; greatest height nearly in the middle, 

 and equal to half the length. Anterior extremity rounded, posterior obtusely pointed. 

 Dorsal margin strongly arched, ventral gently sinuated in front, and sweeping upwards 

 with a slight convexity behind. Seen from above, elongate oval, widest a little in front 

 of the middle ; width equal to more than one-third of the length ; acutely pointed in front, 

 obtusely behind. End view broadly oval. Shell very slightly pilose, dull white in 

 colour, clouded with opaque patches. The terminal claw of the first pair of feet rather 

 more than equalling in length the three preceding joints. Second joint of the last pair of 

 feet more than equal in length to the following two joints ; pectinated spine short. Post- 

 abdominal rami obliquely truncate at the apex ; terminal claws nearly equal ; inner 

 marginal setse slender, and longer than the claws. Second jaws of the male strong and 

 subchelate, alike on both sides, terminal claw of moderate length. Copulative organs 

 subhamate. "Eye large and distinct, composed of three lenses, two lateral and one 

 anterior." 



Length in., height in- ^ .b^^"-— 

 Hab. In 3-30 fathoms. Plymouth (Mr. Spence Bate), Frith of Clyde [Mr. D. Robertson) ; in shell-sand 

 from Guernsey and Birterbuy Bay, Galway Bay, and plentifully in oyster-ooze from Stranraer 

 (G. S. B.) ; in tidal pools, Arran and Herm {Rev. A. M. NornMn), Estuary of Thames {Mr. E. C. 

 Davison) . 



A pretty species, and easily distinguished from others of the genus by its shape and 

 colour. 



4. Pontocypris (?) angtjsta, n. sp. (Plate XXXIV. figs. 43, 44.) 



Carapace, as seen from the side, oblong, semiovate, highest in the middle ; greatest 

 height much less than half the length. Anterior extremity rounded, posterior narrowed 

 and obliquely rounded ; superior margin arcuate, highest in the middle, sloping steeply 

 behind; inferior sinuated in front of the middle, straight behind. Outline, as seen 



3g2 



