160 



OOLITIC OPHIURIDtE. 



ADDENDA. 



Species of the Genus Ophiolepis. 

 A. Species from the Inferior Oolite. 

 Ophiolepis Leckenbyi, Wright, n. sp. PL XIX, fig. 3 a, b. 



Disk small, covered with ten pear-shaped radial scales, arranged in pairs at the 

 base of the rays. The converging apices of the scales appear to have left a small 

 space in the centre of the disk, the integument of which is absent. Arms moderately 

 long, and stoutly built of rings of imbricated scales, arranged in a chain-shaped style of 

 grouping ; the lower surface of the arm-scales have a supplementary piece inserted at 

 the heart-shaped angle formed at the junction of the lateral scales of each arm along the 

 mesial line. Arms tapering very gently towards the termination. 



Dimensions. — Diameter of the disk four tenths of an inch; length of the rays one 

 inch and three tenths. 



Description. — This beautiful little Brittle-star was collected by the late Peter Cullen 

 from the Grey Limestone near Scarborough. It was kindly communicated to me by 

 my old much-esteemed friend the late lamented .John Leckenby, Esq., F.G.S., to whose 

 memory I dedicate the species. As the Leckenby collection now forms part of the 

 Woodwardian Museum, Cambridge, the type-specimens will be found there. The 

 example before me is rather smaller than the type figured in PI. XIX, fig 3 a, b, of the 

 natural size. 



The small disk was covered above with ten radial, pear-shaped scales, grouped in 

 pairs, and placed over the base of the rays. They must have covered the greater portion 

 of the disk ; unfortunately the central part is absent, and the only other specimen which 

 I possess lies upon its upper surface, and displays only the under side. 



The rays were flat, moderately long, flexed, and tapering very gently from their discal 



