428 ME. P. E. COWPEE SEED ON THE [Aug. 1 896, 



completely, except in three trifling details, there is not sufficient 

 reason to institute a new species. The three points of difference 

 are : (1) the point of origin of the oblique furrow on the second 

 pleura ; (2) the length of the axal furrows ; and (3) the more abrupt 

 posterior truncation of the axis in the British form. But I do not 

 consider these differences to be of more than varietal importance. 



The axal furrows are fairly well marked on each side of the axis, 

 though at its posterior end they curve inwards, become less distinct, 

 and do not quite meet in the centre, thus leaving the axis at 

 its apex undefined and continuous with the post-axal area. In 

 Angelin's figure of L. conformis the axal furrows pass over com- 

 pletely into the furrows marking out the sides of the post-axal 

 area, and do not bend inwards round the extremity of the axis. 



In the case of the second pleura a furrow traverses the pleural 

 surface parallel (for the greater part of its length) to the hind border, 

 but dies out before reaching the free point of the pleura. In 

 Angelin's L. conformis the pleural furrow has a more central 

 position on the surface, and originates at the middle point of the 

 base. 



Measurements. 



millim. 



Length of pygidium 24 



Greatest width of do. at level of proximal end of second 



interpleural furrow 31 



Length of axis 10 



Width of anterior end of do 10 



Length of post-axal area 14 



Width of anterior end of do 7 



Width of middle of do 5 



LlCHAS HIBEENICXJS, Portl. 



The occurrence of this species in the Keisley Limestone is another 

 proof of the close affinity of its fauna with that of the Kildare 

 1 Bala ' Limestone. A glabella with the median and large lateral 

 lobe well preserved has been found at Keisley. It exhibits the 

 typical characters of the species. So far as one can judge from 

 Schmidt's 1 figures and descriptions, there is every reason to 

 consider his L. Holmi identical with Portlock's species. 



Lich-as btjlbicefs, Phill. MS. (PI. XXI. figs. 8, 8 a, 8 b & 9.) 



This species is represented in the W T oodwardian Museum by a 

 very perfect middle shield and by a fragment of another. 



The middle shield is strongly convex in an antero-posterior 

 direction, the anterior half curving down steeply in front to the 

 margin. Prom side to side across its middle the convexity is 

 slight, but uniform ; the posterior half is flattened. The outline of 

 the anterior margin of the head-shield is semicircular. 



The glabella has all its lobes well developed. The frontal 



1 Mem. Acad. Imp. Sci. St. Petersb. ser. 7, vol. xxxiii. (1885) no. 1 : ' Eev. 

 ostbalt. Tril.' pt. ii. p. 54, pi. vi. figs. 14 & 15. 



