BV R. ETHERIDGE, JUNR., AND JOHN MITCHELL. 489 



Phacops Crossleii, sp.nov. 



(PL XXXIX., figs. 9-11.) 



Sp. Char. — Body — oblong-oval. Head-shield or cephalon — Semi- 

 circular, rather flattened above, sides abruptly depressed; glabella 

 large, subpentagonal, greatly contracted behind, highest between 

 the eyes, very slightly arched in front, overhanging the front 

 border, rounded so that taking for centre the middle point of the 

 confluent basal pair of glabella furrows, the curve forms the arc 

 of a circle with radius equal to the length between the point 

 mentioned and its front, tolerably inflated, sides straight, inclined 

 inwards at an angle of 60°, greatest width equal to length 

 including neck ring, coarsely granulate; intercalary furrows dis- 

 tinct, deep (in casts) at sides and close to the neck furrow, with 

 which they communicate, thus forming prominent ' basal lobes; 

 second pair linear, feeble and falcate, and seem, in some speci- 

 mens, to communicate with the basal pair, and with the axial 

 grooves; first or frontal pair linear, faint and feeble, arising from 

 the axial furrow at the front corners of the glabella, and 

 traversing it in a very widely Y-shaped manner, the inner portion 

 being shortest and slightly falcate; frontal lobes very large, 

 second pair cleaver-shaped, third pair suboblong, fourth pair 

 nodular; neck furrow very distinct, continued across the side 

 lobes with equal distinctness; and faintly along the inner edge of 

 the border of the free cheeks to the front of the axial groove; 

 neck ring robust, strongly arched, granulate, one large granule in 

 the middle line; axial grooves very distinct, deep and wide; fixed 

 cheeks small; genal lobes'*^ moderately arched, granulate and 

 separated from the palpebral lobes by distinct shallow furrows, 

 which pass posteriorly round and under the eyes, giving relief to 

 those organs. Ej^es large, equal in length to half of the longi- 

 tudinal length of the cheek, anteriorly scarcely reach the front 



* That portion of the fixed cheek between the palpebral lobe and axial 

 furrow and bounded posteriorly by the lateral extension of the neck furrow. 



