156 i?. Etheridge — Notes on Fossils from Red Homalonotus Beds. 



determination from such imperfect materials is hardly to be hoped 

 for, or desired. 



Sp. cultrijugata occurs in the Middle Devonian of the Eifel, and 

 has, according to Dr, Thos. Davidson, F.R.S., some resemblance to 

 Sp. socialis from the Devonian of Menzenberg. Not the faintest 

 indication of ribs is observable on the specimen figured. 



Formation and Locality. — Middle? Devonian Slates, Smuggler's 

 Cove, Torquay. 



4. Rhynchonella laticosta? Dav. (PI. IV. Fig. 7.) 



Notwithstanding the imperfect state of preservation of this speci- 

 men, there can be little doubt in referring it to the species indicated. 

 Not a single perfect specimen of Bh. laticosta has occurred to Dr. 

 Davidson's careful researches, all the examples known to him being 

 crushed and contorted ; no specimen with the shell preserved has as 

 yet been discovered in the British Devonian rocks. 



The specimen figured (Fig. 7) is distorted in length through 

 imperfect slaty-cleavage, and is therefore all the more difficult to 

 determine satisfactorily. 



Probably from 15 to 20 costge ornamented the surface of the 

 valves, but a portion of the specimen lies hidden beneath the matrix. 



Bh. Pengelliana much resembles our specimen, but appears to have 

 more cost^. 



Formation and Locality. — From the Lower Devonian of Smuggler's 

 Cove, near Torquay. 



5. 0. Mpparionix, vel Orthis striatula. (PI. IV. Fig. 8.) 



I infer from the numerous fine costae seen at the ventral edge of 

 Fig. 8, as well as from the muscular impressions, that this fossil 

 may be correctly referred to one of the above-named species, most 

 probably to 0. Mpparionix. 



The costfe are coarser than are those of 0. striatida, and the 

 muscular scars agree better with 0. Mpparionix. The cost^ on the 

 frontal margin are coarser than those upon the lateral portion of the 

 valves. 



It must, however, always be borne in mind that these are only 

 casts, and they do not therefore often afford satisfactory characters 

 upon which to found specific determinations. 



Formation and Locality. — The same as the foregoing. 



6. Chonetes sordida. (PI. IV. Fig. 10.) 



Numerous specimens of Chonetes sordida occur in Mr. Champer- 

 nowne's collection. 



I do not think this form can be referred to the Gh. Hardrensis of 

 Phillips. No spines are observable along the hinge-line, and the 

 hinge-area is less than in the true C. Hardrensis ; the valve is also 

 deeper. 



Fig. 10 represents a portion of the surface of a slab, of dense 

 fine-grained sandstone three inches square, completely covered with 

 this shell. 



Loc. and Formation as in the preceding. • 



