446 ME. S. S. BUCKMAN OX [Aug. I906, 



that depicted in the Encyclopedic Methodique. Davidson's practice 

 with regard to these types was very unfortunate. He says : — 



' There is . . . some difficulty in a few cases of defining which were Lamarck's 

 real types, as several specimens of different species are sometimes placed on 

 one tablet .... it is possible that some of the specimens now in B. Delessert's 

 hands many have been displaced while in the possession of Prince Massena . . . 

 I must . . . add that, in some few cases the specimens belonging to Lamarck's 

 collection were in bad condition, which I have restored in the figures from 

 well-preserved specimens of the identical species in my own collection, in order 

 to prevent misconceptions as to the shells intended as types.' {Op. cit. p. 434.) 



He not only restored, but he sometimes depicted quite other 

 specimens. The result is the very opposite to what he intended — 

 misconception as to what are Lamarck's (Yalenciennes's) types is 

 increased instead of prevented. 



Pygope Duvali (Newman) 1844. (PI. XLI, fig. 14.) 



Terebratula diphya ; Pusch, 1837. T. Duvallii, Newman, 1844, figs, a, b, c 

 (lectotype), fig. d ? Cf. T. janitor, Pictet, 1867, pi. xxx, fig. 3. T. diphyoides ; 

 Quenstedt, 1871, pi. xlvii, fig. 117 only. 



I obtained this reference from J. E. Gray's Catalogue [20]. 

 Newman's paper seems to have escaped notice otherwise ; its title 

 does not appear in Davidson & Dalton's Bibliography. 



The species was obtained from Grasse in the South of Erance, a 

 well-known Neocomian locality. 



A specimen in the British Museum, B. 10355, is similar to 

 Newman's figures a, b, & c, but smaller, and has a much larger 

 perforation. This agrees better with Pygope, for Newman's 

 delineation of it seems rather too small. This specimen is from 

 Wadi Sabella, Algiers. 



Pictet's figures in pis. xxxiii, fig. 1, xxxi, fig. 6, xxxi, fig. 4, 

 show a series roughly parallel to the series Antinomia dilatata — 

 A. angusta. But Pictet's forms differ from these by having a 

 straight side-margin. On the other hand, they do not seem to 

 belong to Pygope, as the perforation is situated more posteriorly, 

 and the side-margin is recessed. Compare also the form shown 

 by Zittel, 1870, ' T. diphya ' pi. xiii (xxxvii) fig. 1. Its straight 

 margin distinguishes it from the A. dilatata-series ; its sunken 

 margin, etc. from Pygope. 



Perforate Stage. 

 Securiform = shaped like a battle-axe. 

 Pygope (?) diphya (von Buch) 1835. 



Anomia diphya, Colonna, 1606. Terebratula diphya, L. von Buch, 1835, pi. i, 

 fig. 12 (a reproduction of Colonna' s figure). T. diphya; Catullo, 1840, and 

 Antinomia diphya ; Catullo, 1851 (reproductions of the same). Terebratula 

 diphya ; Pictet, 1867, pi. xxxi, fig. 3, and pi. xxxi, fig. 1 ? 



Notes. — The name can only date from L. von Buch's use of it; 

 and his drawing is insufficient for exact work. It seems desirable to 



