648 DR. G. J. HTNDE AND ME. HOWARD FOX ON [NOV. 1 89 5,. 



cannot be discerned save in a few spots, and the intaglio side (which 

 may have retained the external shelly crust) has not been preserved. 

 The specimen measures 25 mm. in length and 12 mm. across the 

 thoracic segments ; the length from the front of the glabella to the 

 point of the cheek-spine is 20 mm., the length of the cheek-spine 

 itself being 8 mm., and its breadth where it joins the cheek 2 mm„ 

 The head is much broken up and squeezed back under the axis of 

 the thorax, displaying more or less the first three thoracic segments 

 which thus override the head ; the six posterior thoracic segments re- 

 main undisturbed and in their normal position united to the pygidium. 

 The pygidium is rather narrow and somewhat pointed, and it has a 

 smooth border ; the number of coalesced segments cannot be ascer- 

 tained, as the subdivisions are obliterated, but its general form 

 agrees very well with that of Griffithicles longisjnnus. 



In consequence of the squeezing in of the glabella, the cheek- 

 spines with the free cheeks are pressed apart and bent outwards, 

 giving the cheek-spines the appearance of diverging from the head 

 at a wide angle on either side. The impression indicates that the 

 spines were long, flat, and striated, which is Portlock's description 

 of the spines in G. longispinus. 



This species has hitherto been recorded only from the Carboni- 

 ferous Limestone of Carnteel, Tyrone. At Codden Hill it occurs 

 in a platy, grey, siliceous rock. Collected by Mr. J. G. Handing,. 

 F.G.S., of Barnstaple. 



Proetus, sp. a. PI. XXYIII. figs. 7 & 7 a. 



This species is represented by a body consisting of nine thoracic 

 segments and a pygidium, also by one detached pygidium ; the latter 

 retains the shelly covering, but the former is decorticated. 



Breadth of thorax at anterior border 6 mm., at union with 

 pygidium 5 mm., length of the 9 segments 3 mm., breadth of axis 



2 mm. Breadth of axis of pygidium 2 mm., breadth of pygidium 

 4-5 mm., length 2 mm. 



Detached pygidium : breadth 7 mm., length 3 mm., width of axis 



3 mm. ; this specimen shows from 6 to 7 coalesced segments in the 

 axis and about 5 ribs on each lateral border ; these ribs pass from 

 the axis into the lateral border, and show a tendency to bifurcate 

 near the margin. The specimen is in a white siliceous rock from 

 Combe Wood Quarry, and that described in the previous paragraph 

 comes from the Codden Hill Quarry, near Barnstaple. Collected by 

 Mr. J. G. Handing. 



Proetus, sp. b. PI. XXYIII. fig. 8. 



This small trilobite agrees best with the genus Proetus ; it is re- 

 presented by an intaglio of the head with 5 to 6 segments of the 

 thorax attached, and a pygidium with 3 thoracic rings joined to it, 

 slightly separated from the rest of the specimen on the same surface 

 of rock. The head-shield is imperfect ; but one cheek shows the 

 small eye, the raised margin of the lateral border, and the short 



