76 DR. L. F. SPATH ON THE AMMONITES [vol. lxxix, 



The last-named author's Arietites ['Asteroceras '] brooki and 

 A. turneri, 1 by the way, probably are also misidentified. 



A. plotti (Reynes) has not been found by Dr. Lang, but I have 

 seen examples in the collections of Dr. Wyatt Wingrave, Mr. 

 James Francis, and Mr. F. H. Butler, with fragments or impres- 

 sions of large M. birchi attached ; we may, therefore, take it as 

 fairly certain that the fo>c7w'-nodular is the home of this common 

 species. A. pseudobonnardi, sp. nov. (= Ammonites bonnardii 

 "Wright 2 non A. d'Orbigny, Natural History Museum, C 1891), 

 which differs from Reynes's Ammonites plotti in having coarser 

 ornamentation, and an allied Arietites, sp. nov., with feeble orna- 

 ment and almost smooth outer whorl (No. 2955, Coll. L. F. Spath) 

 probably also came from the birchi zone. 



(F) Genus Cymbites Neuuiayr. 



The genus Cymbites, numerously represented in the upper beds 

 of the Shales- with-' Beef,' is a stock the S3 r stematic position of 

 which recpures consideration as a preliminary to the review of its 

 various representative species. 



The type of Cymbites is C. globosus Neumayr, and the holotype 

 of the species is Ammonites globosus Schiibler in Zieten ('Die 

 Versteinerungen Wiirttembergs ' 1832, p. 37 & pi. xxviii, fig. 2), a 

 doubtful form from the 'Lower Oolites.' Quenstedt in his 'Jura.' 

 as in his ' Ammoniten des Schwabischen Jura,' 3 and also Oppel 4 

 considered the form of the Middle Lias 3 to represent the ' normal 

 type ' ; hence Ammonites centriglobus 0~pj)e\=Am.m. globosus 

 Quenstedt [ ' Cephalopoden ' 1849, p. 188 & pi. xv, figs. 8 a-8 c, 

 and 'Ammoniten des Schwabischen Jura' 1885, pi. lxii, figs. 29 

 & 30, according to Pompeckj 5 ] might be chosen as the genotype. 

 Most writers, however, including Hyatt, Haug, Pompeckj, and 

 Buckman, have connected Cymbites with Agassiceras, which 

 develops unconstricted but otherwise similar forms. Cymbites 

 was thus clearly used for the dwarf -forms of the Icevigatus group, 

 and the restriction of ' Cymbites ' to the Domerian Ammonites 

 centriglobus seems inadvisable. Since this dwarf-development of 

 the Middle Lias cannot satisfactorily be assigned to any known 

 contemporaneous genus, a new name (Metacymbites) may be 

 proposed for it. The suture-line, with deep trifid lobes, is quite 

 different from that of the earlier Cymbites. It may be related 

 to Fucini's Coeloceratid genus Diapliorites ; but Rosenberg's 

 '■Agassiceras'' arthaberi 6 probably does not belong to it. Haug's 



1 ' Cefalopodi Liassici del Monte di Cetona ' pt. iii, Pal. Ital. vol. ix (1903) 

 pi. xix (xxx) figs. 1-4. 



2 ' Monograph of the British Lias Ammonites ' Pal. Soc. pt. ii, 1879, pi. xi, 

 figs. 1-3 & pt. iv, 1881, p. 287. 



3 ' Jura' 1858, p. 172 ; ' Ammoniten des Schwabischen Jura ' 1885. p. 336. 

 1 ' Der Mittlere Lias Schwabens ' Jahresh. Ver. Vaterl. Naturk. Wurtt. 



vol. x (1853) p. 95 & pi. iii, fig. 7. 



3 Jahresh. Ver. Vaterl. Naturk. Wiirtt. vol. 1 (1894) p. 239. 



6 ' Die Liasische Cephalopodenf auna der Kratzalpe im Hagengebirge ' Beitr. 

 Pal. (Est.-Ung. vol. xxii (1909) p. 271 & pi. xiii, figs. 15-18, pi. xiv, figs. 1-2. 



