558 H. Woodward — NeiO British Fossil Crustacea. 



kindly sent me several additional specimens from Ireland, and, amongst 

 them, one which is evidently a new form (see subjoined Woodcut). 



The specimen, which 

 measures three lines in 

 length, two and a half in 

 breadth, and two lines in 

 height, was obtained from 

 the Carboniferous Lime- 

 stone of Little Island, 

 Cork. 



The carapace, which is ri§^- 1- Kff- 2. 



finely granular all over, ''■''''''' '7'^T'^ortxZs^^^Xl^'''""'^' 



is divided, in front of Fig. 2. side view of same, 



the cervical furrow, into eight lobes, and behind the same furrow 

 into two lobes, which latter occupy more than half the shield. The 

 two posterior lobes are divided down the mesial line by the dorsal 

 ridge, which at rather more than one-third the length stops short. 

 Here two minute depressions occur, and the cervical furrow may be 

 said to branch out rig^it and left, inclosing a central triangular space 

 (cardiac region?), having its base-line directed forwards and slightly 

 crenated. In front of this triangular lobe two oblong lobes, united 

 along the median line, occupy about one-fourth the length of the 

 carapace (gastric region?), and are bordered by two pairs of lateral 

 and one central, somewhat triangular lobe in front ; the whole being 

 probably surrounded by a narrow up-turned rim or border. 



Cyclus Jonesianus rivals C. Wrightii in height, to which form and 

 to C. lilolatus, it is, no doubt, closely related. 



I have great pleasure in dedicating this species to my kind friend 

 and fellow-labourer in palaeontology. Professor T. Eupert Jones, 

 r.G.S., of the Eoyal Military and Staff Colleges, Sandhurst, to whom 

 I am indebted for much valuable assistance in understanding the hosts 

 of the Bivalved Crustaceans (the Ostracoda and Phyllopoda) , to the 

 fossil forms of which he has devoted so many years of patient, ardent, 

 and successful research. ^ 



7. Cyclus RanMni, H. Woodward, PI. XXIIL, Fig. 1. 



I first drew attention to this remarkable form at the Meeting of 

 the British Association in 1868 (see Eeports, p. 73). I extract the 

 following account of it in order to complete this notice : — 



" This new form of Cyclus, discovered by Dr. Eankine of Carluke, 

 in the Carboniferous shales of that place, is most remarkable in 

 appearance, and far more like a parasitical or larval form of Crusta- 

 cean than the Cyclus radialis, which certainly possessed a hard 

 calcareous test. A comparison of the two, however, leaves no doubt 

 in my mind in referring them both to the same genus. 



" The shield is about four lines in diameter, and conveys the idea 

 of an extremely thin test flattened out on the soft shale by pressure. 

 The ' eye-spots ' occupy the same relative position as in C. radialis ; 



1 Professor T. Eupert Jones informs me that Mr. J. W. Kirkby has obtained evidence 

 of a species of Cyclus in the Permian, but I have not been so fortunate as to see these 

 remains, and must therefore defer their fuller notice imtil a future paper. 



