PALEONTOLOGY. 297 



S. H. Scudder (233) comumiiicates a brief note on J)r. Woodward's 

 paper in the Geological Magazine, " On British Carboniferons Cock- 

 roaches." 



J. M. Clarke (31) has published in the Journal of Morphology a beauti- 

 ful and exhaustive memoir on the eyes of the common Devonian Trilo- 

 bite, Phacops rana Green. He discusses the subject under the follow- 

 ing sections : " The character of the visual area;" " The composition of 

 the visual node," showing the arrangement of the lenses ; " The struc- 

 ture of the lens;" "The multiplication and diminution in the number of 

 lenses ;" " The development of the lens ;" " The structure of the sclera;" 

 " The modes of preservation of the visual surface." 



August F. Foerste (83«) communicates some notes on the discovery 

 of two new species in the Trenton limestone of Minnesota. These species 

 are Illccnus {Nileus) minnesotensis sp. nov., p. 478, f. I, and Ilkenus Her- 

 ricli, sp. nov., p. 497, f. 2, the latter of which he compares with Ilkcnus 

 pterocephalus Whitfield, of the Niagara strata of Wisconsin. Figure and 

 description are also given of lllcenus ambiguus Foerste, from the Niagara 

 group of Pennsylvania. 



E. G. Chapman (23) publishes a short paper on the classification of 

 Trilobites. 



E. N. S. Ringueberg (224) read a paper on a Trilobite track which 

 presents the ten pairs of impressions of the feet in groups, separate from 

 each other, from which he concludes that the mode of progression was 

 by a series of jumps. 



VERTEBRATA. 



G. F. Matthew (IGG, 1G8) describes an interesting fish from the Silu- 

 rian at Nerepis Hills, King's County, New Brunswick, uuder the name 

 Diplaspis Acadica, (gen. et sp. nov.) page 69 (of No. 166), and this 

 species he regards as allied to Pteraspis, but distinct. The species was 

 originally described as Pferaspis (?) Acadica by the author, in the Ca- 

 nadian Record of Science, 1886, pages 251, 252 and 323-325, and was 

 taken from shales considered to be of an Upper Silurian age. 



J. S. Newberry' (199) discusses the characters of the genus Edestus^ 

 and describes the Jaw of a gigantic species called Edestus (/i(/<i)itcus (sp. 

 nov.), page 121, plate vi., f. 1. The paper by Miss Hitchcock (115) is a 

 discussion of the relations of this genus. Professor Newberry has also 

 published several papers on fossil fishes from the Devonian and Carbo- 

 niferous (191, 194, 195, 197, and 198). In the paper on Titanichthys (195) 

 a general description of the bones is given, illustrated with diagrams 

 and drawings (which are not reproduced in the paper), and the name 

 Titanichthys Clarldi (sp. nov.) was given to the species in honor of the 

 discoverer, Dr. William Clark. The note in the American Geologist 

 by E. W. Clay pole (34) refers to this same s])ecimen. In the paper 

 (198), which is but an abstract. Professor Newberry describes brietiy aud 



