





RECENT BRITISH OSTRACODA. 



U)[) 



varieties of this fine species, I must refer the reader to a Monograph of the Posttertiary 

 Entomostraca which is in preparation for the Paheontographical Society. 



17. Cytherb angtjlata (Sars). (Plate XXVI. figs. 39-42.) 



Cythereis angulata, Sars, loc. cit. p. 40. 



Scandinavian type. Distribution : Recent— Baffin's Bay, Norway, Great Britain. Fossil— ( \ lanal and 

 raised beaches, Scotland and Norway. 



Carapace, as seen from the side, oblong, quadrilateral, greatest height near the front, 

 and equal to more than half the length. Anterior margin rounded below and -loping 

 steeply backwards above; posterior narrower, rectangularly truncate, and somewhat 

 protuberant below the middle; ventral margin nearly straight, dorsal sloping backwards 

 in a straight or gently curved line from the anterior hinge. Outline, as seen from above, 

 very irregular, somewhat lozenge-shaped, tapering slightly towards the front, which i< 

 very obtuse or almost truncate, the sides parallel and constricted in the middle; post ni or 

 extremity broadly and obtusely mucronate, greatest width equal to less than half the length, 

 the hinge-margins forming at their junction a narrow, sharply cut longitudinal sulcus. 

 End view broadly ovate; deeply constricted above the middle; broad above, sharply 

 keeled below. Surface irregularly undulated and marked with angular excavations of 

 variable size ; a conspicuous rounded tubercle near the anterior hinge, and another large 

 rib or elongated tubercle near the centre of the valve ; a sharply defined transverse ridge 

 terminates the sculptured portion of the shell, beyond which the posterior portion projects 

 on a lower level. The ri^ht valve is rather smaller and more angular than the left, and 

 the dorsal margin is more depressed. Colour brown. "Third and fourth joints of the 

 upper antenna} confluent, the last short and armed with a strong spine. Second joint of 

 the last foot much shorter than the two following. Copulative organs of the male small, 

 apical portion obtuse, subhamate." 



Length - 3 -V in., height - 7 \ in. 



Hab. The Minch, 45-60 fathoms (Mr. J. G. Jeffreys) ; Shetland, Lerwick, Cumbrae, Macduff Ha 

 and Peterhead (Mr. D. Robertson) ; Scarpa Flow, Orkney [Mr. E. C. Davison). 



bour 



This is very distinct from any other recent British species, and is apparently one of 

 the rarest. Sars notes that specimens from Kmnark are much larger and more ahundant 

 than those found by him in Christianiafiord ; he therefore infers that it is a peculiarly 

 northern species. It occurs in the glacial clays of Scotland and Norway. 



!8- CrTHEiw dtjbia, n. sp. (Hate XXXII. figs. 75, 76.) 



Carapace, as seen from the side, subquadrangular, highest in front, greatest height 

 equal to more than half the length. Anterior extremity rounded, posterior obliquely 

 ^truncate, angulated about the middle, below which are three small teeth ; . upenor 

 margin slightly convex, sloping almost in a straight line to the posterior ^*T*£ 

 ^ forms an abrupt angular projection; inferior deeply sinuated m front of the midd 

 Seen from above , P the Se^ Legutarty su bovate, about twice as long as broad ; sides 



VOL. XXVI. 



