MESOZOIC TIME — CRETACEOUS. 855 



Acanthoceras mammillare, Scaphttes Texanus R. ; Ptychodus mammillaris, Lamna com- 

 pressa, L. Texana, Cfaleocerdo, Carcharodon. 



(3) The Austin limestone (chalk) : Rhizopods of the genera Textnlaria and Globigerina ; 

 also Hemiaster Texanus R., Cassidulus cequoreus Morton, Terebratulina Guadalupce R., 

 Ostrea congesta, Gryphcea vesicularis Lamk., Exogyra ponderosa (young form), E. costata 

 Say, E. eolumhella, Ostrea larva, Pecten Nillsoni, Inoceramus biformis, I. umbonatus, I. 

 subquadratus, I. exogyroides, I. labiatus, Badiolltes (?) Austinensis R., Eulima Texana R., 

 Chemnitzia gloriosa R., Nautilus Dekayi, Baculites anceps, B. asper, Ammonites 

 (Placenticeras) Guadalupce R., A. {Mortoniceras) Texanus R., Mortoniceras Shoshonense, 

 Schlcenbachia dentato-carinata R. 



(■4) The Taylor or Exogyra ponderosa marls: E. ponderosa (very abundant), 

 Gryphcea vesicularis, Ostrea larva, Amusium simplicum Con., Pyrifusus granosiis Con. 

 The species have greater resemblance to those of the Atlantic and Gulf borders than to 

 those of the Continental Interior ; and this is true also of the following. 



(5) Glauconitic beds of northeast Texas : the species of (4), and also Pecten Burling- 

 tonensis, Inoceramus Crispii, Crassatella lineata Shum., Pachycardium Spillmani, 

 Pholadomya Lincenumi, Chemnitzia gloriosa, Purpura cancellata, Pleurotoma Texana, 

 P. Tippana, Anisomyon Haydeni, Nautilus Dekayi, Ptychoceras Texaniim, Turrilites 

 helicinus, Helicoceras Navarroense, Baculites annulatus, B. Spillmani, B. Tippoensis, 

 Placenticeras placenta, Belemnitella mucronnta. Further, the Eagle Pass beds on the Rio 

 Grande, referred to the age of the Fox Hills and Laramie, contain Ostrea glabra Meek, 

 Anomia micr onema, ?ind species of Area, Cyrena, Amin. (Sphenodiscus) pleurasepta Con., 

 and other species. The above names are from lists by Hill. See further, for species of the 

 Glauconitic group and Ponderosa marls that are identical with those of the Ripley and 

 Lower Greensand groups, tables on page 854. 



On the Invertebrate Paleontology of Texas, see especially F. Roemer, Kreid. Texas, 

 1852; also. Pal. Abhandl., Berlin, 1888; Shumard, Acad. Sc, St. Louis, i., 1860, and 

 Boston Soc. N. H., viii., 1861-62; R. T. Hill, Am. Jour. Sc, 1887; Bep. Geol., Texas, 

 vol. i., annotated check-list, Bull. No. 4, Geol. Texas, 1889 ; Proceedings of the Biological 

 Society of Washington, B.C., vol. viii., 1893 ; Bull. Geol. Soc. of Am., vol. v., 1894 ; C. A. 

 White, on fossils from Texas, Proc. U. S. Nat. Mus., ii., and his Correlation of the 

 Cretaceous, Bull. U. S. G. S., No. 82 ; F. W. Cragin, Texas Geol. Survey, 1893. 



Continental Interior (Upper Missouri region), according to Meek : — 



1. Dakota Series. — Besides species of fossil plants, Pharella (?) Dakotensis, Tri- 

 gonarca Siouxensis, Cyrena, arenarea, Margaritana, Nebrascensis, etc. 



2. Colorado Series. — (a) Fort Benton : Inoceramus labiatus, I. fragilis, I. tenui- 

 costatus, Ostrea congesta, Pholadomya {Anatimya) papyracea, Scaphites larvceformis, 

 S. vermiformis, S. ventricosus. Nautilus elegants; the Ammonites, A. Midlananus, 

 Mortoniceras Shoshonense, Prionocyclus Woolgari, etc. (6) Niobrara : Inoceramus {avicu- 

 loides) labiatus, I. deformis, Ostrea congesta, etc. 



3. Montana Series. — (a) Fort Pierre : Inoceramus sublcevis, I. Crispii, I. tenuilineatus, 

 Busycon Bairdii, Neithea quinquecostata, Anisomyon borealis, Lucina occidentalis, Avicula 

 linguiformis ; the Ammonoids, Ammonites complexus and Placenticeras placenta, with 

 Baculites ovatus, B. compressus, Helicoceras Mortoni, Scaphites Conradi, S. nodosus; 

 Nautilus Dekayi. (6) Fox Hills : Anchura Americana, Pyrifusus Newberryi, Cardium 

 speciosum, Mactra alta, Tancredia Americana, Belemnitella bulbosa, Nautilus Dekayi, 

 Placenticeras placenta, Scaphites Conradi, Baculites ovatus, B. grandis. 



No species of the genera of keeled Ammonites, Prionocyclus, Prionotropis, Morto- 

 niceras, states Stanton, have been found in America above tlie limits of the Colorado 

 formation ; and further, no species of Heteroceras, Ptychoceras, and Anisomyon occurs 

 below the Montana, no large Baculites, such as B. ovatus, B. grandis, and B. compressus, 

 nor the species Scaphites Conradi, S. nodosus. 



