and species of Silurian Radiata. 289 



at a very acute angle, about ten interstices in the space of 2 

 lines ; mesial keel very strong, with a row of small pores ; 

 fenestrules very regular in size and shape, quadrangular, 

 slightly longer than wide, their width about equaling that of 

 the interstice ; usually three large thick -edged pores to the 

 length of a fenestrule and one larger at the end of each 

 dissepiment. 



In size, mode of branching, and rigid straightness of the in- 

 terstices, this is not unlike the F. subantiqua, but is completely 

 distinguished by its closer dissepiments, forming shorter fenes- 

 trules, and its much fewer and larger pores. From the row of 

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

 FenestelUna. 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 lai'ge Devonian coral of Goldfuss, with which I am well 

 acquainted. 



Not uncommon in the Wenlock limestone of Dudley. 



ECHINODERMATA. 



Taxocrinust Orbignii (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 scapulae, nearly 1^ 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. 



I have not distinctly made out the interbrachial plates, but 

 as there seems a notch between the upper adjacent edges of the 

 scapula;, I have little doubt they existed ; besides their presence, 

 the s])ecies is easily distinguished from the Ichthyocrinus pyri- 

 formis (Phill. sp.), by the greater number of joints in the arms 

 and hands, the much thicker column, and the nearly unvarying 

 character of the joints as they approach the pelvis. 



In the " Asterias " bed of the Upper Ludlow at High Thorns, 

 Underbarrow. 



Glyptocrinus basalis (M'Coy). 



Sp. Char. Cup subpyriforni, pelvic plates hexagonal, slightly 



