NORTH AMERICAN INVERTEBRATE PALEONTOLOGY. 569 



Nantiloidea the bulb is covered by a true protoconch continuous with 

 the shell of the apex. 



Hyatt, Alpheus. — Genera of Fossil Cephalopods. (Proc. Boston Soc. 

 Nat. Hist., April 4, 1883, vol. xxii, pp. 253-338. Boston, 1884.) 

 This paper is preliminary to a monograph which will appear in the 

 memoirs of the Museum of Comp. Zoology. The first dozen pages are 

 devoted to a discussion of the Cephalopoda. The rest of the article is 

 a description of genera arranged according to the author's system of 

 classification and based on his studies of the development of the Cepha- 

 lopoda. The following new genera are established : Vaginoceras, Plecto- 

 ceras, Litoeeras, Diacliploceras, Metacoceras, Tainoceras, Mojsvaroceras, 

 Grypoceras, Enclimatoceras, Sactoceras, Geisonoceras, Cycloceras, Kiono- 

 ceras, Spyroceras, Daicsonoceras, Rizosceras, Acleistoceras, Tetramero- 

 ceras, Sexameroceras, Trimeroceras, Pentameroceras, Septamerocerds, Bil- 

 lingsites, McelonoceraSy Oonoceras, Cranoceras, Ncedyceras, JSremoc&ras, 

 Ptyssoceras, Anomaloceras, Centroceras, ZUtelloceras, Halloceras, Ruto- 

 ceras, Triplooceras, Kophinoceras, Strophiceras, Solenoceras, Phloioceras, 

 Tripteroceras, Edaphoeeras, Tripleuroceras, Apsidoceras, Titanoceras, Ep- 

 Jiippioceras, Stroboceras, Discitoceras, Phacoceras, Aphelceceras, Tribolo- 

 ceras, Koninckioceras, Aipoceras, Sphyradoceras, Uranoceras, Barrandeo- 

 ceras, Pselioceras, Nepliriticeras, Cenoceras, Gymatoceras, Mimoceras, 

 Eeminaiitilinus, Gelceceras, Gephuroceras, Mantieoceras, Parodiceras, Tor- 

 noceras, Mceneceras, ISporadoceras, Brancoceras, Munsteroceras, Gastrio- 

 ceras, Paralegoceras, Prinoceras, Glyphioceras, Dimeroceras, Homoceras, 

 Noniismoceras, DimorphoceraSj Sandbergeoceras, Beloceras, Pharciceras, 

 Schistoceras, Triainoceras, Popanoceras. 



Hyatt, Alpheus. — Fossil Cephalopoda in the Musuem of Comparative 

 Zoology. (Proc. of the Amer. Ass. for the Adv. of Sci., vol. xxxii, 

 pp. 323-361, Minneai)olis meeting, August, 1883.) [Not distributed till 



1884.] 



This is also a partial abstract from the monograph just mentioned, 

 and a very interesting discussion of the classification and evolution of 

 this group. 



James, J. F. — Two Species of Tertiary Plants. (Science, vol. iii, No. 

 62, p. 433. Cambridge, 1884.) 



Mr. James criticises two of the determinations made by Professor Les- 

 quereux in his Tertiary Flora (U. S. Geol. and Geogr. Surv. Terr., F. V, 

 Hayden in charge.) [Not yet published.] 



James, J. F. — The Fucoids of the Cincinnati Group. (Jour. Cincinnati 

 Soc. Nat. Hist., October, 1884, vol. vii, pp. 1-9, pis. v and vi,) 

 The author is a little premature in condemning to the rank of mud 



bubbles some of the Silurian fossils. A little inquiry would have eliciteil 



