16 DREDGING REPORTS. 



distance in advance of these, and separated from each other. 

 Dorsal yiew elongated ovate. End view nearly ronnd. Hinge 

 margin crenulated throughout its length. Carapace white, 

 smooth, but studded with scattered opaque white punctures. 

 Length half a line. 



Dredged 100 miles off Tynemouth in 1862, and 10-15 miles 

 off Seaham in 40-48 fathoms in 1864. 



It would have been impossible to identify this species with the 

 figure and description given by Mr. T. Rupert Jones in " The En- 

 tomostraca of the Tertiary Formation ;" but Mr. Gr. S. Brady has 

 kindly informed me that he has ISTorwegian and Arctic specimens 

 which seem to be identical with those taken on this coast, and 

 which have been pronounced by Mr. Jones to be his Cytheridea 

 dehiUs. 



Cythere declivis, n. sp. PI. V, figs. 9-12. 



Subtriangular, closely resembling a miniature Mytilus edulis 

 in form ; highest before the middle, length to breadth as about 

 one and three quarters to one ; subcompressed. Yentral margin 

 slightly (rarely considerably) incurved in the centre ; dorsal mar- 

 gin anteriorly well arched, but sloping rapidly from about the 

 middle towards the posterior extremity. Anterior end wide and 

 well rounded ; posterior extremity narrow, rounded. Lucid spots 

 consisting of four placed close together in a transverse curved 

 line (of which the lowest is the largest, and each of those above 

 smaller than its predecessor, ) and in front of these a large comma- 

 formed spot, apparently formed by the coalescence of two. "Ventral 

 view cuneiform, moderately convex behind, much compressed in 

 front, juncture of the valves impressed. Carapace white, trans- 

 lucent, smooth, but marked with conspicuous opaque white 

 scattered punctures ;* anterior margin with radiating riblike 

 markings. Length not quite one third of a line. 



Taken off Holy Island and Seaham during the past season. I 



* What I have called here and in the description of the last species " punctures" are 

 not sunken impressions, but slightly elevated tubercular processes, which are perforated 

 in the centre. Such structures are not uncommon among the Ostracoda, and might 

 perhaps be best described as "perforated papillae." 



