SUPPLEMENT TO THE 



Genus — Camarophoria, Kin^, 1S46. 



43. Camarophoria rhomboidea, Phillips, sp. Dav., Dev. Men., p. 70, PL XIV, figs. 



19—22. 



At page 529 of his 'Die Bmch. des Mittel- und Ober-Devon. der Eifel,' 1871, 

 Dr. Kayser considers Ter. bijugata and T. hracliyptycta, Schnur, Ter. subdentata, GeinitZ;. 

 and B/ii/n. ? Lummatoniensis, Dav., to be synonyms of Phillips's T. rhomboidea. I am not 

 prepared to admit the specific identity of B. Lummcdoniensis with Phillips's species, but it 

 may be possible that I am mistaken. 



Genus — Skenidium, Hall (Gr. SKJjftSiov, tentoriolum, a little tent). 



Hall, 'Thirteenth Annual Keport of the Regents, on the State Cabinet &c.,' p. 70, 1860. 



Mystrophoka, Kayser. Die Brach. des Mittel- und Ober-Devon. der Eifel, p. 612, 

 1S71. 



" Shell subpyramidal, somewhat semicircular, with or without median sinus and 

 elevation. Area large, triangular, divided by a narrow deltoidal foramen, which is some- 

 times closed at the summit by a concave deltidium; valves articulating by teeth and 

 sockets, which are often obscure and obsolete ; dorsal valve flat or varying from depressed 

 convex to concave; beak entire, or indented by the foramen. Cardinal line straight, and 

 usually equalling the width of the shell. Cardinal plates broad and well developed, 

 marked by the imprints of the peduncular muscles, and produced in the middle in a 

 pointed process. The cardinal process extends as a median senium through the length of 

 the shell, and may be simple or divided at its extremity. Ventral valve elevated, sub- 

 pyramidal ; beak straight or slightly arched. Muscular impressions undetermined. 

 Exterior surface covered with radiating striae. Type Skenidium insigne, Hall." 



