254 BRITISH FOSSIL CRUSTACEA. 



Species 6.— CYCLUS JONESIANUS :— H. Woodw., 1870. PI. XXXII, fig. 46 a, b. 



Cvclus Jonesianus, H. Wcodw., 1870. Geol. Mag., p. 558, vol. vii, woodcut, figs. I 



and 2. 

 — — H. Woodw., 18/3. Brit. Assoc. Report, p. 304. 



Whilst engaged in drawing up this paper Mr. Joseph Wright kindly sent me several 

 additional specimens from Ireland, and amongst them one which is evidently a new 

 form. 



The specimen, which measures 3 lines in length, 2-| in breadth, and 2 lines in height, 

 was obtained from the Carboniferous Limestone of Little Island, Cork. 



The carapace, which is finely granular all over, is divided in front of 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 right and 

 left, inclosing a central triangular space (cardiac region ?), having its base-line directed 

 forward 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 upturned rim or border. 



Cyclus Jonesianus rivals C. Wrighiii in height, to which form and to C. bilobatus 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. Rupert Jones, F.R.S., of the Royal Military and Staff 

 Colleges, Sandhurst, to whom I am indebted for much valuable assistance in understand- 

 ing the hosts of the Bivalved Crustaceans (the Ostracoda and PJiyttopoda), to the fossil 

 forms of which he has devoted so many years of patient, ardent, and successful research. 



Species 7.— CYCLUS RANKIN1 :— H. Woodw., 18GS. PI. XXXII, fig. 42. 



Ctclus Rankini, H. Woodw., 1868. Brit. Assoc. Report, p. 72, pi. ii, fig. 2. 

 — — H. Woodw., 1870. Geol. Mag., vol. vii, pi. xxiii, fig. 1, p. 558. 



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

 at Norwich, in 1868. 



This new form of Cyclus, discovered by Dr. Rankin, of Carluke, in the Carboniferous 

 Shales of that place, is most remarkable in appearance, and far more like a parasitical or 





