909 



RiBEI. 



tensisj Bill, Trimerella minor ^ Dall. T, galtensis^ Dav. & 

 King. Dinoholus galtensis^ D. and K. More closely allied to 

 Monomerella^ than to Trimerella, (See Q. J. S. Lond. XXX.) 

 Durham, Canada West, in Oalt formation. Vb\ 

 Ribeiria compressa, Whitfield, Bull. Amer. Mus. Nat. Hist. 



N. Y. Vol. 1, No. 8, 1886, page 344, i)lale 33, lig. 3, natu/alsiBe^ 

 side view of a cast of this ( Ceratiocaris) Phyllocaris ; 4, 5, 

 enlarged back and side diagramic views of it. There is no evi- 

 dence of bivalve character ; no trace of a hinge, as in Leperditia^ 

 etc. ) ; the shell seems to be merely bent over along the line of the 

 back, as a continuous piece, enclosing both sides of the ani- 

 mal's body, and the muscular scars are situated exactly on this 

 middle line. Compare E, longiuscula, Billings. Fort Cassin, 

 Vt. Calciferous SS. Div, D, II a. 



Ribeiria ventricosa, Whitfield ; same reference, figs. 1, 2 

 (with E, compressa above) enlarged twice ^^ide and back views 

 of a cast, showing muscular markings; looks like a small JVu- 

 culay but there is no evidence of a hinge; somewhat like E, 

 calcifera., Bill. Pal. Foss. Vol 1, figs. 326, a^ 5, c, but more gib- 

 bous and more prominent beaks. Note that what remains of 

 the substance of the carapace (shell) is crystalline, and not 

 homogeneous as usual in crustacean fossils. Fort Cassin, Vt., 

 Calciferous. II a. D. (Brainard and Seely.) 



Rill marks (cast) made by the retreating wave water on 



5.; muddy shore in the 



I coal age, fossilized 

 on a slab of Carbon- 

 iferous mud sand- 

 stone. Nova Scotia. 

 Dawson's Acadian 

 GeoL, 1868, page 27, 

 p^^. &^. 6 ^r educed in size. 



Ddwson. Acad. Geol. 1868. . 



