CLASS V CEPHALOPODA 583 



and culminates in the great increase of rachiglossate and toxoglossate families 

 in Tertiary and Recent times. (See tables, pp. 580, 581.) 



[The text for the preceding chapter on Gastropoda was revised for the first edition of 

 this work by Professor Henry A. Pilsbry, of the Philadelphia Academy of Natural Sciences, 

 and is reprinted here with some slight changes at the hands of Drs. W. H. Dali and 

 R. S. Bassler. — Editor, 1 



Olassö. 0EPHALOPODA.1 



Head sharphj defined in Recent forms, except Nautilus. Foot transformed into a 



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 — A7ithula, J.,iiJhev die Kreidefossilien des Kaukasus. Beitr. Pal. Österreich - Ungarns, etc., 

 1899-1900, vol. xii. — Arthaber, G. von, Die Cephalopodenfauna der Reifliuger Kalke. Beitr. 

 Paläont. Geol. Österreich - Ungarns, etc., 1896, vol. x. — Idem, Das Jüngere Paläozoicum aus. der 

 Araxes-Enge bei Djulfa. Beitr. Pal. Geol. Österreich -Ungarns, 1900, vol. xii. — Idem, Die Trias 

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 Diego-Suarez. Ann. de Paleontol., 1906-7, vol. i, — Branco, W., Beiträge zur Entwickelungsge- 

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 the Young of Baculites compressus. Proc. Acad. Nat. Sei. Philad., 1891-92. — Buch, L. von. 

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Canavari, M. , Sui fossili del Lias inferiore nell' Appenino centrale. Atti Soc. Toscano, vol. iv., 

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 sowerbyi. Bull. Soc. Geol. France [3], vol. xiii., 1884-85.— Sur la Classification des Ceratites de 

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 Mem. Soc. Geol. France, 1912.— Dwight, W. JB., Recent Explorations in the Wappinger Valley 

 Limestone. Amer. Journ. Sei. [3], 1884, vol. xxvii.— Favre, F., Die Ammonitiden der unt. Kreide 

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Foord, A. H., Catalogue of the Fossil Cephalopoda in the British Museum, pt. i., 1888 ; ii., 

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