REV. A. M. NORMAN ON" THE CRUSTACEA. 19 



with large deep cells, which leave the insterstices standing out 

 in the form of an elegant network. Junction of the valves keeled. 

 Length one fourth of a line. 



Taken off Holy Island July, 1864; and obtained by me also 

 during the previous year in the Shetland seas. 



Cy there latissima, n. sp. PI. VI, figs. 5-8. 



Cythere obesa, Norman, M.S. Trans. Tyneside Nat. Field 

 Club. Yol. Y, p. 266, and Brit. Assoc. Report for 1861 

 {but not C. obesa of Reuss). 



Peach-stone formed, or shortly ovate, with a short central pos- 

 terior prejecting process; greatest height subcentral; length to 

 breadth as one and a half to one, excessively tumid and gibbous. 

 The ventral margins of the valves are produced into a conspicuous 

 keel, on either side of which the carapace is extremely broad, the 

 valves being projected directly outwards in the form of a strong 

 ridge which externally bends outwards and downwards so as to 

 reach below the level of the margin of the valves. The tumidity 

 of the carapace in this part is excessive, and from thence the 

 valves slope rapidly to the dorsal margin. End view triangular. 

 Carapace white, opaque, punctate. Length one third of a line. 



This remarkable form was dredged in 1862 on the Dogger 

 Bank, and during the past season off Holy Island, and off Seaham. 

 I have also specimens from Shetland and Poundstone Bay, and 

 Mr. Gr. S. Brady has found it among sand dredged at the mouth 

 of the Pibble, and in shell-sand from Cowes, Isle of "Wight. 



Cythere guttata, n. sp. PI. VI, figs. 9-12. 



Cythere concentrica, Norman, M.S. Eeport Brit. Assoc, for 

 1864 (but not of Reuss nor Williamson.*) 



Ovate, or peach-stone shaped, slightly produced to a central 

 point behind ; greatest height and greatest tumidity before the 

 centre ; very tumid. Dorsal margin nearly straight in the centre, 

 suddenly sloping posteally, and forming in conjunction with the 

 infero-posteal similarly suddenly sloping margin a small truncated 

 projection. Ventral margin slightly waved. Anterior extremity 



