MISS COIGXOU ON A NEW SPECIES OF CYPHASTIS. 421 



22. On a neiv Sjjecies of Cypkasvis from the Carbonifero-js Hocks of 

 YoKKSHiRE. By Miss Coignou, Scholar of Xewiiliam College, 

 Cambridge. (Read March 26, 1890.) 



(Communicated by Prof. T. M'Kenxv Hughes, F.E.S., F.a.S.) 



During the visit of Prof. Hughes's geological party to the Craven 

 district in June last, I was fortunate enough to find in the Pendle- 

 side limestone * at the base of Butterhaw, near Cracoe, a fairly 

 perfect head of a Trilobite which appears to belong to the genus 

 Ci//)haiipis. Hitherto this genus has not been recorded above the 

 Devonian, and its discovery in rocks of Carboniferous age seems 

 worthy of notice. 



Description. — Head small, semicircular, very convex, 8-5 millim. 

 in length and 5 millim. in width. Frontal border broad, flattened, 

 minutely granulate. Its margin produced into a number of equi- 

 distant, horizontal, cylindrical spines, 'o millim. long. In our 

 specimen they are visible on the right antero-lateral portion of the 

 border, and one near the left genal angle. They arc •-! millim. 

 apart from each other, and as the frontal border is 9*6 millim. in 

 length, there must have been 2-1 spines present. Genal angles 

 invisible, probably prolonged into short spines. Glabella very 

 prominent, ovoid, narrow behind, and widening gradually for four 

 fifths of its length. Slightly constricted at the two glabella-furrows 

 on each side, much raised above the cheeks ; covered with small 

 granules and bearing four tubercles, a pair near the upper part of 

 the anterior sloping surface, a large unpaired one near the centre, 

 and a smaller median one behind. Of the glabella-furrows the 

 anterior one is short and, seen from the side, is directed backwards, 

 while looked at from above it appears as a pit in the axal furrow, 

 marking off an imperfectly defined narrow oblong lobe. Posterior 

 furrow deep, extending backwards to the neck-furrow and bounding 

 the postero -lateral lobes, which are elevated and pyriform. Neck- 

 furrow broad and shallow. iS"eck-lobe short, convex, badly 

 preserved. Cheeks subtriangular, elevated, sloping abruptly along 

 the inner and posterior sides, finely granulated, continuous in front 

 of the glabella. Facial suture invisible. Eyes sessile, reniform, at 

 the summit of the cheek, opposite the centre of the glabella. 



Thorax and tail unknown. 



Affinities. — The specimen is provisionally referred to Ci/pJia.y)is, 

 but it differs from the typical species of that genus in possessing two 

 pairs of glabella-lobes. Barrande mentions the occurrence of two 

 transverse furrows on each side of the glabella in C. novella and C. 

 depressaf. From both of these our species is clearly distinguit>hed 



* " Explications des Excursions," Congres geologique Intenuttional (1SS8) 

 p. 80. 



t Svst. Sil. de la Bohomo, vol. i. ]>. 470. 



Q. J.G. S. ]^o. 183. 2n 



