40 



MR. E. S. COBBOLD OX THE TRILOBITE FAENA [March 1913, 



Ptychoparia (Liostracus) lata appears to be closely related to 

 Liostracus linnarssoni Brogger, which is found at Andrarum and 

 Bornholm throughout the same Tessini Zone. 



The two forms Pt. (L.) clubla and Agraulos cf. quadrangularis 

 are rather poorly preserved, but appear to be the same forms as 

 those quoted from the Davidis Fauna of the Shoot-Eough-Boad 

 beds of Comley. 



A comparison of the fauna of the matrix of the Breccia-Bed 

 with that of the Quarry-Bidge Grits shows a considerable contrast, 

 the species of trilobites, so far as they are known, being all 

 different. 



Table illustrating the Contrast between the Trilobites of the Groomii 

 Fauna and those of the Breccia-Bed. 



Genera. 



Species recognized u 



p to the p r e s e n t. 



From the Quarry- 

 Kidge Grits. 



From th e Breccia- 

 Bed. 





groomii Lapworth 1 



intermedins, sp. nov. 

 cf. A. quadrangularis 



(Whitfield). 

 Two species indeter- 

 minate. 



mqualis Linnarsson. 



hufo Hicks. 

 impressa Linnarsson. 

 reticulata, sp. nov. 

 punctatus Salter. 

 lata, sp. nov. 

 dubia Cobbold ? 





Agraulos (Strenuella) ?... 



None found 



emarginata Linnarsson, 1 

 var. longifrons Cobbold / 



Conocoryphe ... 





lakei Cobbold 



None found 



None found 



None found 





Ptychoparia (Liostracus) 

 Ptychoparia (Liostracus) ? 



So far as they go, the species recognized indicate the presence 

 at Comley of the Paradoxides-tessini Fauna, and it seems probable 

 that the Breccia-Bed of Comley Brook represents part, if not the 

 whole, of the P.-tessini Zone of Scandinavia. Fnrther, it seems 

 clear that the Groomii Fauna of the Quarry-Bidge Grits of 

 Comley is quite distinct. 



V. Inferences. 



(1) Recalling to the reader's recollection the fact stated above 

 that the fossils found in the component blocks of the Breccia-Bed 

 belong to the Helena group of the Protolenus'-Oallavia Fauna, while 



1 Fragmentary remains indicate that there are two, or perhaps three, otber 

 species of Paradoxides which cannot at present be identified in the Quarry- 

 Bidge Grits. 



