REV. A. M. NORMAN ON THE CRUSTACEA. 21 



Tyneniouth, in 1862 ; and again obtained last summer 10-15 

 miles off Seahani in about 40 fathoms. 



Cythereis Jonesii, Baird. PL VII, figs. 5-8. 



Cytbereis Jonesii, Baird, Hist. Brit. Entom. p. 175, PL XX, 



fig. 1. 

 Cytbereis fimbriata (Boemer), Norman, Ann. Nat. Hist., 



Jan. 1862, PL III, fig. 9. 



Having bad tbe opportunity, through the kindness of Dr. 

 Baird, of examining the type specimens of his Cythereis Jonesii, 

 I find that they are the same species as that described by myself 

 in the Annals under the name of Cythereis fimbriata (Boemer). 

 As some doubt may attach to the identification of the species 

 with that of Boemer it will be better to make use of the name 

 given to it in " The History of British Entomostraca." 



Cythereis Jonesii has been taken by me 100 miles east of Tyne- 

 mouth, in 1862; in Lamlash Bay; and at Shetland: and Dr. 

 Baird' s specimens are from the Isle of Skye. Neither Dr. Baird's 

 figure nor my own do justice to the great beauty of form of this 

 species when in a perfect state, since in each case they were 

 drawn from single and imperfect valves. The species is now 

 therefore refigured from a fine specimen taken on the Dogger 

 Bank, and it seems also desirable thus to redefine it. 



Oblong, or oblongo-elliptic ; greatest height at the anterior 

 extremity of the hinge ; length to breadth as about two to one ; 

 compressed above, very tumid below. Ventral margin slightly 

 arched, extended at both extremities beyond the dorsal margin ; 

 dorsal margin somewhat concave ; extremities obliquely truncate, 

 the anterior the wider. Carapace smooth in the central area, but 

 ornamented with a fringe of greatly developed linguiform, erect 

 or nearly erect processes commenCjing at the middle of the ante- 

 rior extremity, and passing round the ventral side of the valve at 

 a short distance from the margin, and thence ultimately bend- 

 ing upwards, and terminating in some greatly elevated processes 

 situated on the central portion of the valves at a little distance 

 from the hinder extremity. Similar linguiform processes, (four 

 or five in number, ) again reappear at the inf ero-posteal angle, and 



