NORTH AMERICAN INVERTEBRATE PALEONTOLOGY. 569 



iSTautiloidea the bulb is covered by a true protoconch continuous with 

 the shell of the apex. 



Hyatt, Alphexjs. — Genera of Fossil Oephalopods. (Proc. Boston Soc. 

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

 This paper is i)relirainary 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 : Vagi7ioceras, Plecto- 

 ceras, Litoceras, Diadiploceras, Metaeoceras, Tainoceras, Mojsvaroceras, 

 Gry])oceras, Enclhnatoceras, Sactoceras, Geisonoceras, Cycloceras, Kiono- 

 ceras, Spyxoceraa, Dawsonoceras, Rizosceras, Acleistoceras, Tetramero- 

 ceras, Hexameroceras, Trimeroceras, Pentameroceras, Septameroceras, Bil- 

 lingsites, Mwlonoceras, Oonoceras, Granoceras^ Ncedyceras, Uremoceras, 

 Ftyssoceras, Anomaloceras, Centroceras, Zittelloceras, Halloceras, Buto- 

 ceras^ Triplooceras, KopMnoceras, Strophiceras, Solenoceras, Phloioceras, 

 Tripteroceras^ Edaplioceras^ Tripleuroceras^ Apsidoceras, Titanoceras, Ep- 

 hippioceras, Stroboceras, Discitoceras, Phacoceras, Aphelwceras, Tribolo- 

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

 ceras, PseUoceras, Nejyhriticeras, Cenoceras, Gymatoceras, Mimoceras, 

 HeminautUinus, Gelceccras, Gephuroceras, Manticoceras, Parodiceras, Tor- 

 noceras, Mcvneceras, tiporadoceras^ Braucoceras, Munsteroceras, Gastrio- 

 ceras, Paralegoceras, Prinoceras, Glyphioceras, Dimeroceras, Eomoceras, 

 Nomismoceras, Dimorphoceras^ Sandbergeoccras, Beloceras, Pharciceras, 

 Schistoceras, Triamoceras, Popanoceras. 



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

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

 pp. 323-361, Minneapolis 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.] 



Jasies, 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 elicited 



