PALEONTOLOGY. 297 



S. 11. Sciidder {2'.Vo) ('oiiiimiiiicjitcs ji In'ivA' note on Dr. Woochvanrs 

 puper in the Geological Magazine, " On liritisli Caiboniferons Cock- 

 roaches." 



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

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

 bite, rhaco})^ rnna Green, lie discusses the subject uiuler the follow- 

 ing sections : " The character of the visual area;" " The comi)ositiou 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 {S3a) communicates some notes on the discovery 

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

 are Illwnus {N'ileus) minnesotensis sp. no v., p. 478, f. 1, and IlkvnuH Her- 

 rield, sp. nov., p. 497, f. 2, the latter of which he compares with Illwnus 

 pteroeephalus Whitlield, of the Niagara strata of Wisconsin. Figure and 

 description are also given of llUvnus 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 teu 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 (100, 108) describes an interesting fish from the Silu- 

 rian at Nerepis Hills, Jving's County, New Brunswick, uiuler the name 

 Diplmpis Aeadiea, (gen. et sp. nov.) page 09 (of No. 106), and this 

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

 originally described as rteraspis (?) Acadiea by the author, in the Ca- 

 nadian Record of Science, 1880, pages 251, 2.52 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 Udestus^ 

 and describes the Jaw of a gigantic species called IJdestus f/if/<mteus (sp. 

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

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

 ])ublished several pajx'rs on fossil fishes from the Devonian and Carbo- 

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

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

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

 Titanichthys Clarlii (sj). nov.) was given to the species in honor of the 

 discoverer. Dr. William Clark. The note in the American (Jeologist 

 by E. W. CIayi)ole (31) refers to this same spe(!imeii. In the paper 

 (198), which is but an abstract. Professor Newl)erry <leseribes briefly and 



