94 ROYAL SOCIETY OF CANADA 



The speciinon Irom Manuol's Brook makes it clear that Linnarsson's 

 surmise as to a missing Iree-tlieek in that species is well taken, and its 

 discovery unites the Swedish, Welsh and American species in one genus, 

 as has been assumed in the references given above. Through Erinnys 

 venuloMi and the Newfoundlnnd form we olttain a restoration of the 

 complete test except the hypostonie. This, if analogous to that of Cono- 

 coryphe would have been oval in form, bordered all ai'oiind and having a 

 horn-like process extending towards the front nuii-gin on each side.' 



The form from Manuel's Brook which we Hgure is probably of the 

 species Erinnys venulosa mentioned by Mr. Walcott as occurring in Zone 

 b of No. 7. So far as the middle ]»iece ot the head is concerned (the only 

 part described by Angelin and Linnarsson) it quite agrees in size and 

 proportions ; but it has also movable cheeks and a portion of the thorax. 

 The dorsal suture, however, does not prove to be that of Conocoryphe 

 as Linnarsson conjectured it might be, but corresponds to that of Cteno- 

 cephalus, since no ])ortion of the cheek, except the extreme corner is cut 

 OÏÏ. and the suture runs around the rim ; but in this respect it agrees 

 with Erinnys. The space by which the anterior ends of the cheek are 

 parted, is equal to the length of the head omitting the occipital ring. 

 The o-enal spines are of about the same length as those tigured for 

 Carausia menevensis, and there is in front of the glabella (in this tiattened 

 example of E. breviceps) a slightly raised area, extending and^ widening 

 towards the dorsal sutures, somewhat similar to that which Dr. Hicks 

 represents in his figure of the former species. If we allow for lateral 

 compression in the Welsh species it will be seen that there is a strong re- 

 semblance between the two. 



Five joints of the thorax and part of a sixth are preserved. They 

 are strongly geniculated at about one-third from the extremity, beyond 

 which they are flexed backward. The rachis is narrower than the length 

 of the inner part of the pleura, and the outer part of the pleura is wedgQ- 

 pointed. 



Sculpture. — That of the head is as described by Linnarsson; that of 

 the pleune consists of tine transversely rugulose striœ, visible wnth a lens. 



Size. — Length of the head, 10 mm. Width across the base (includ- 

 ing the movable cheeks), 15 mm. Length of the movable cheeks, 15 

 mm. Width about 4 mm. Length of a thoracic joint, 25 mm. Width, 

 1^ mm. Length of the ring, 6 mm. 



Horizon and locality. — The Paradoxides Davidis sub-fauna at Manuel's 

 Brook. 



Erinnys venulosa^ Salt., according to Dr. Hicks has 24 joints in the 

 thorax. The pygidium is " semi-cii'cular and has a tolei'ably strong axis 



I Perhaps the cracks at the front of the ^hibella in Carausia Menuvensi-s (Quart. 

 Jour. Geol. Soc, May, 1K72), pi. vi., (Ig. 7, mark the position of these processes in that 

 species. 



