176 SILURIAN RADIATA. 



pores on the keel^ this would enter M. D^Orbigny^s subgenus 

 Fenestellina. I suspect, from some specimens I have seen, that it 

 is possible some of the figures given by Lonsdale in the ' Silurian 

 System^ as the Fenestella prisca (Gold, sp.), may be coarse, in- 

 accurate representations of this species ; if this should even prove 

 so, the name I propose should be retained, as it has no affinity 

 with the large Devonian coral of Goldfuss, with which I am well 

 acquainted. 



Not uncommon in the Wenlock limestone of Dudley. 



[Col. University of Cambridge.) 



Retepora Hisingeri (M'Coy). 



Sp. Char. Corallam forming irregular fan-shaped expansions, in- 

 terstices about one-third of a line wide ; dissepiments narrower 

 than the interstices, fenestrules ovate, slightly angulated, about 

 two- thirds of a line long and half a line wide (five interstices in 

 the space of 2 lines) ; cells very small, from four to seven rows 

 on the interstices, generally about three on the dissepiments 

 (internally forming short ovate cells), about a third longer 

 than wide, obverse, very minutely granular. 



As it is scarcely possible even to determine Hisinger's Retepora 

 reticulata with certainty, as he gives no information relative to 

 the pores, there could be no objection to apply that name to the 

 present species, which agrees with his figure as far as it goes, 

 were it not that Mr. Lonsdale has already applied it to a very 

 similar coral, which he however places in the genus Fenestellaj 

 and figures with only the two rows of pores usual in that genus. 



Very abundant in the slates of Cefn Coedog ; Cyrn y brain, 

 W. of Wrexham; Blain y Cwm, W. of Nantyre, Glyn Ceiriog; 

 slates of Mynydd Fron Frys, five miles W. of Chirk ; Coniston 

 limestone of Coniston Water Head, Lancashire. 



[Col. University of Cambridge.) 



ECHINODERMATA. 



Taxocrinus? Oi'bignii (M'Coy). 



Sp. Char. Column cylindrical, about 2 lines in diameter at an 

 inch from the pelvis, and not varying materially in character 

 within 2 inches from the pelvis; joints finely granulated, 

 uniform, two in the space of 1 line ; pentagonal pelvic plates 

 1 line high, alternating with which are the pentagonal or ob- 

 scurely heptagonal scapulse, nearly l^- line long ; arms of two 

 quadrangular and one cuneiform joint each 1 line long, and 1^ 

 line wide, the latter giving off two hands of five joints, the 

 last being cuneiform, and giving origin to two fingers ; from 

 pelvis to end of fingers 1 inch 3 lines. 



