890 Progress of Invertebrate Paleontology [November, 



Mr. Scudder has also nearly completed works on fossil spiders 

 and the Archipolypoda. 



Part 11 of the " Revision of the Palaeocrinoidea," by Messrs. 

 Charles Wachsmuth and Frank Springer has appeared in the 

 Proceedings of the Academy of Natural Sciences of Philadel- 

 phia for 1 87 1, pp. 1-237, and tnree P^tes. This important and 

 exhaustive work embraces the family Sphaeroidocrinidse, with the 

 subfamilies Platycrinidae, Rhodocrinidae and Actinocrinidae. It 

 is greatly to be desired that nothing will occur to prevent the 

 consummation of the plan of these gentlemen to complete this 

 work for the whole order. 



Mr, C. D. Walcott has published his memoir, which was an- 

 nounced in my last review, on " The Trilobite ; new and old evi- 

 dence relating to its organization," in the Bulletin of the Museum 

 of Comparative Zoology at Cambridge, Vol. vm, pp. 191-224, 

 with six plates. This paper contains, among other matter, a 

 resume of all the evidence concerning the character of the ven- 

 tral appendages of Trilobites, with illustrations of those organs. 

 He has also published a brief article in the American Journal of 

 Science, Vol. xxn, pp. 394, 395 ; " On the nature of Cyathophy- 

 cus," in which he expresses the opinion that the genus mentioned 

 is a member of the same group to which Dictyophyton belongs, 

 and which Professor Whitfield has shown to have close affinities 

 with Euplectella, or the so-called glass-sponges. He is now en- 

 gaged on some palseontological work for one of the divisions of 

 the U. S. Geological Survey. 



Professor A. G. Wetherby has published the following papers 

 in the Journal of the Cincinnati Society of Natural History: 

 " Description of Crinoids from the Upper Carboniferous of Pu- 

 laski county, Kentucky," Vol. in, pp. 324-330, illustrated on 

 plate 9 ; " Description of new fossils from the Lower Silurian 

 and Subcarboniferous rocks of Ohio and Kentucky," Vol. IV, pp. 

 77-85, illustrated on plate 2; "Description of new species of 

 fossils from the Lower Silurian and Subcarboniferous rocks of 

 Kentucky," Vol. iv, pp. 177-179, illustrated on plate 5. 



In my review for 1880 I inadvertently omitted to mention Pro- 

 fessor R. P. Whitfield's "Notice of new forms of fossil Crusta- 

 ceans from the Upper Devonian rocks of Ohio, with descriptions 

 of new genera and species," which appeared in the American 

 Journal of Science, Vol. XIX, pp. 33-42. The new genera are 



