82 BRITISH FOSSILS. 



minal notch. The outer edges are thickened, and the substance of 

 the whole appendage is thick. The lateral plicae run down in 

 oblique rows on the inner (?) surface, becoming more and more linear, 

 till they become straight lines like the pennse of a feather ; and on 

 the outer side, impressed distant converging striae cut up, as it were, 

 the whole surface into narrow bands, the terminations of these bands 

 being serrated projections in P. problematicus, but in this species 

 they come to an even edge on the notched border. 



Ovisacs (?), Plate XIV. figs. 13, 13*. The egg-packets (Parka), 

 found in plenty with this species at Trimpley, show the membranous 

 veil in several cases. The ova are of considerable size, generally 

 oval, and placed a little apart in the younger packets, fig 13, but 

 they become hexagonal or polygonal, from mutual pressure, in the 

 older ones, figs. 13*. 



Localities. Base of the OLD RED SANDSTONE, at Ludlow 

 Railway Station (abundant) ; at Trimpley, north of Bewdley, as- 

 sociated with Ptemspis Banksii. (Mr. G. E. Roberts' Cabinet.) 



