H. Woodward — New British Fossil Crustacea. 557 



lated. In front, and partly inclosed by the Y-sbaped cervical ridge, 

 and forming the top of the anterior portion of the buckler, are four 

 rounded lobes with polygonal borders, arranged in a diamond- 

 shaped pattern, the posterior one (cardiac ?) being the largest of 

 the four. 



Placed around and forming a double border to these four lobes are 

 eleven (?) others arranged, firstly, five in one row, and, secondly, 

 (along the outer margin) six. (Surface of buckler finely granulated.) 



The three specimens found, belonging to this species, are all from 

 the Carboniferous Limestone of Little Island, Cork, from the col- 

 lection of Mr. Joseph Wright, of Belfast. 



5. Cyclus radialis, Phillips, sp., PL XXIIL, Fig. 2 and 2a. 



The subjoined description I copy from p. 72, Eeports, 1868, 

 British Association Eeport, Norwich Meeting. 



" I was at first doubtful whether the Cyclus radialis of M. de 

 Koninck, from Belgium, really represented the Agnostus radialis of 

 Prof. Phillips, from the Carboniferous Limestone of Bolland, York- 

 shire. I have fortunately been able to see and examine the original 

 specimen of Cyclus radialis of M. de Koninck (and Gilbertson's 

 specimens from Bolland, Yorkshire, preserved in the British 

 Museum), and find that it does agree with the figure in Phillips's 

 ' Geology of Yorkshire ' (vol. ii. t. 22, fig. 25) ; but it entirely 

 disagrees with M. de Koninck's magnified figure. I have, there- 

 fore, redrawn the Belgian form." (See Brit. Assoc. Eept. 1868, 

 plate ii. fig. 1.) Mr. HoUick, in drawing Cyclus radialis for this 

 present paper, was good enough to point out that the posterior 

 border of one of M. de Koninck's specimens, from the Carboniferous 

 Limestone of Vise, Belgium, drawn on our Plate XXIIL, Fig. 2, 

 was not broken (as I had supposed and figured it in my Eeport, see 

 plate ii.), but was naturally indented upon the posterior border on 

 each side, so as to leave a rudimentary spine at the termination of 

 the dorsal ridge, as seen in our present figure. 



" Cyclus radialis (Fig. 2) is an elegant shield-shaped carapace, five 

 lines long by four lines in breadth ; its general form is hemispherical, 

 with a narrow smooth border (roundly indented behind, so as to 

 leave a rudimentary medial spine in the centre) ; the shield is di- 

 vided down its centre by a raised longitudinal (dorsal) ridge, from 

 which radiate seven diverging ribs (transversely wrinkled), whose 

 rounded extremities reach the lateral and posterior border. 



"The anterior cephalic portion occupies about a quarter of the 

 entire shield, and is ornamented by the spreading out of the raised 

 central ridge, and by two sub-central rounded prominences which cor- 

 respond in position to eyes, but are not facetted. The ribs are orna- 

 mented, each vnth from three to five tubercles, irregularly disposed 

 over their surface." 



This species (which is the first published species of the genus) 

 occurs in the Carboniferous Limestone of Little Island, Cork ; Bolland 

 and Settle in Yorkshire ; and Vise, Belgium. 



6. Cyclus Jonesianus, H. Woodw., sp. nov. (Woodcut). 



Whilst engaged in drawing up this paper, Mr. Joseph Wright has 



VOL. Til.— NO. LXXVIII. 36 



