PALEONTOLOGY. 293 



Report N. Y. Mus. Nat. Hist., p. 3GL», pi. x, 1'. 9, 10). Tlie aiitlior refers 

 to the same genus the species Uucalyptocrinus armosus, McGliesuey 

 (= Glyptocrinns armosufi, Hall). 



The late U. P. James (131) published a reprint of the description of 

 Agelacrinus HolbrooM, U. P. James, page 25, with a figure. 



VY. R. Billings (IG) published the following new genus and species 

 from the Trenton formation of Ottawa and neighborhood : Ottaicacri- 

 nus, gen. no v., and 0. typus^ sp. no v., p. 49, Calceocrinus furciUatus, sp. 

 uov., p. 61, G. rugosiis, sp. uov., p. 53. 



THE MOLLUSCOIDA. 



A few papers have been written on the Polyzoa and Brachiopods 

 which do not fall into any of the other divisions of this report. 



C. Rominger (227) describes a new form of Bryozoa from the drift of 

 Ann Arbor, Michigan, under the name of Patellapora stellata, sp. uov., 

 p. 11, pi. i, f. 10. 



Joseph F. James has a short note (125) on the value of the internal 



' sections of corals when used for specific characters, considering them 



to be of small value because of the great variation they show, and of 



the different forms presented according to the relation of the plane of 



the section to the individual cells, 



A. F. Foerste (82) and E. O Ulrich (249) reply to Mr. James's criticism, 

 defending the methods in use by Mr. Ulrich and Mr. Ford. 



J. F. James (128) presents a paper " on the MonticuHpora a coral, not 

 a Polyzoan." He had already i)ublished an elaborate review of the 

 Trenton Monticuliporoidne (130). In the present paper the author re- 

 views the characters of the family Monticulporoidai of Nicholson, in- 

 cluding the genera Mo)iticulipor a and Geramopora, and defends the view 

 of Nicholson in placing them among the Coelenterata near the Helio- 

 poridffi, as opposed to the classification ofE. O. Ulrich, who classes them 

 with the Polyzoa, " Bryozoa." 



H. A. Nicholson (202) writes on certain anomalous organisms which 

 are concerned in the formation of the PahBozoic limestones. In the 

 course of the paper he defines them under the names Mitcheldeania gre- 

 gari(7, n. sp., p. 16, f. 1, 2, and Solenopora fiUformis, n. sp., p. 21, f. 4. 



The characters of the genus Girvanella, Nicholson and Etheridge, 18S0, 

 are also discussed, and comparisons are made with related American 

 forms. In another pai)er (201) Professor Nicholson comments upon 

 new or imperfectly known species of Stromatoporids. No new s{)ecies 

 are described, but some American species are figured with descrii)tions 

 and notes ui)on their characters. 



E. O. Ulrich (248) discusses the genus Sceptropora with remarks upon 

 Helopora, Hall. The author describes and figures a new genus and 

 species of Lower Silurian Polyzoan, under the name Sceptropora/acula, 

 gen. et sp. nov , pp. 228,229, obtained from Manitoba, and also from 

 two localities in Illinois. He considers the systematic position of the 



