RECENT BRITISH OSTRACODA. 



405 



faintly pitted or papillose, transversely sulcate near the middle, longitudinally rugose 

 on the ventral surface. Hinge-processes feebly developed ; left valve minutely crenulate. 

 Carapace of the male more elongate, superior margin slightly concave. Colour yellowish. 

 " One eye. Antennge short, last joint of the upper shorter than the preceding. Second 

 joint of the last pair of feet about equal to the united length of the two following joints, 

 terminal claw long and slender. Basal portion of the male copulative organs narrow 

 above, apical portion subtriangular." 

 Length in., height 9-5- in. : ' 't ^ ' 



Hab. Dredged in the Miuch, 45-60 fathoms, and near Guernsey in 15-30 fathoms [Mr. J. G. Jeffreys) ; 

 Roundstone Bay, 2-3 fathoms, and Northumberland coast, 45 fathoms (G. <S. B.); Cumbrae [Mr. 

 D. Robertson) ; in shell-sand from Galway [Prof. Rovmeij). 



The specific name ventricosa being preoccupied by Reuss, I have here adopted the 

 term cuneiformis, which I had applied to the species in MS. before seeing the work of 

 G. O. Sars. 



13. Cythere limicola (Norman). (Plate XXXI. figs. 38-41.) 



Cythereis limicola, Norman, Nat. Hist. Trans. Northumb. & Durh. vol. i. p. 20, pi. vi. figs. 1-4. 

 Cythere nodosa, Sars, loc. cit. p. 34. 



? complexa, Brady, Brit. Assoc. Report, 1866, p. 210. 



areolata, Brady, Trans. Zool. Soc. vol. v. p. 381, tab. Ixii. figs. 2a-d. 



Scandinavian type. Distribution : Recent — Baffin^s Bay, Norway, Great Britain. Fossil — Glacial clay 

 and raised beaches, Scotland. 



Carapace short, tumid, quadrangular ; length to height as about three to two, not much 

 higher in front than behind. Seen from the side, the anterior margin is well rounded 

 below and slopes very steej)ly backwards above, terminating in an elevated angle over 

 the anterior hinge. Posterior margin somewhat angular in the middle, slightly rounded 

 below, and sloping nearly in a right line upwards to the dorsum, its junction with which 

 is marked by an angular projection ; the dorsal margin, between this and the anterior 

 angle, is considerably hollowed. Ventral margin rather sinuous. The outline as seen 

 from above is hexagonally cuneate or boat-shaped, very broad behind, and tapering 

 abruptly at each extremity ; greatest breadth near the posterior extremity, equal to more 

 than half the length. End view triangular, with an excessively convex base ; outline 

 irregularly sinuous. Surface of the shell rugose, tuberculated, and marked with fine 

 closely set puncta ; the general direction of the rugse is in curved transverse lines ; but 

 the most conspicuous elevation runs longitudinally at a little distance within the ventral 

 margin : there are two very large tubercles or nodules on the dorsal aspect of each valve 

 near the posterior angle, and one in the situation of the anterior hinge-joint. Colour 

 brownish yellow. " No eyes. Antennse elongated, last joint of the upper elongated, 

 linear, and somewhat shorter than the preceding ; third joint of the lower antennae more 

 slender than usual. Peet slender and elongated ; second joint in the last pair a little 

 shorter than the united length of the two following, terminal claw long and almost 

 straight. Basal portion of the male copulative organs small and rounded, apical portion 



