Fauna of the Lower Devonian Beds of Torquay. 305 



base, horizontally extended, and about one-sixtb the length of the 



pygidium. Surface of shell ornamented with small distant granules. 



Dimensions. — (The specimen is laterally compressed and distorted.) 



Length of head-shield (actual) . . . about 



Width of head-shi«ld (actual) . 

 Length of glabella .... 



Width of glabella at base 

 Length of pygidium (actual) to base of sjjines 

 Width of pygidium (actual) 

 Width of axis of pygidium (actual) at front end 

 - Length of terminal sjiines .... 



Horizon. — Red Beds (Staddon Grits). 

 Locality. — New Cut, above Meadfoot Bay, Torquay. 

 Museum (S. 88) (S. 6). 



mm. 

 40 

 40 

 30 

 21 

 33 

 44 

 L5 



Sedgwick 



Remarks. — The material on w^hich this new species H. hifurcatus 

 is founded consists of the laterally compressed and somewhat 

 obliquely distorted cast and internal impression of a nearly complete 

 individual (S. 88). All the parts of the body are in their natural 

 position, except the head-shield, which has been bent back under 

 the body and thus broken off from the thorax, but it is only slightly 

 displaced from its proper position of attachment. The internal cast 

 of the head-shield therefore points backwards in the specimen, 

 and is attached to the impression of the thorax and pygidium. There 

 is also the impression of part of the doublure and epistomal plate 

 of the same head-shield, but the cast of these parts is not preserved. 



VOL. LVII. — NO. VII. 20 



