442 MR. S. S. BTJCKMAN 03 [Allg. I906, 



Antinomia sp. a. (PI. XLI, fig. 4.) 



Terehratula diphya ; Pictet, 1867, pi. xxxi, fig. 7. 



This form has the two lobes nearly in contact, and is the transition- 

 stage between the bifidate and perforate species. Possibly Zeuschner 

 has given it a name. 



Perforate Stage. 

 Triangulate. 



The four following species show four forms ranging from wide- to 

 narrow-angled. The first three show much-curved side-margins ; 

 about that of the last there is no information. 



In these and other forms the characters of the vascular markings 

 might repay careful attention. In specimens that I have examined 

 there seems to be much difference in their size, number, and approxi- 

 mation. 



Antinomia antinomia (Catullo). 



Terehratula antinomia, Catullo, 1827, pi. v, figs, s & t only. 



It is assumed that Catullo's very poor figures are intended to 

 represent a specimen of the next species. 



Antinomia dilatata, Catullo, 1851. (PI. XLI, fig. 5.) 



Antinomia dilatata, Catullo, 1851. Terehratula diphya; Suess, 1852, pi. xxxi, 

 figs. 13-15. T. dilatata, Pictet, 1867, pi. xxxii, fig. 4. T. Catulloi, Pictet, 

 1867, page 202 (pars). 



The latangulate form. 



Xote. — It is assumed that in Catullo's sketch the spread of the 

 lateral angles has been exaggerated. 



Antinomia Catulli (Pictet) 1867. 



Terehratula antinomia, Catullo, 1829 & 1840, non Cat. 1827. T. diphya; 

 8. P. Woodward, 1853. T. diphya ; Davidson, Mon. Introd. 1854, pi. vi, 

 fig. 3, fig. reduced ? T. dilatata, Pictet, 1867, pi. xxxii, fig. 1 (type), pi. xxxii, 

 fig. 5, & pi. xxxii, fig. 3 (xxxiii, 2 ?). T. Catulloi, Pictet, 1867, p. 202 (pars). 



Narrower than the last. 



Note. — A species with the vascular markings very approximate 

 and very strong. These characters are well shown by a specimen in 

 the British Museum (Nat. Hist.), P. 8688. 



Antinomia cor (Bruguiere). (PI. XLI, fig. 6.) 



Terehratula cor, Bruguiere, 1792. Terehratula Ency. Meth. 1797, pi. ccxl, 



fig. 6. Terehratula dilatata ; Pictet, 1867, pi. xxxii, fig. 2 (pi. xxxii, fig. 5 ?). 

 T. Catulloi, Pictet (pars). Pygope diphya; Schuchert, 1896. 



This is the oldest named post-Linnean species of perforate 

 Terebratulids. It is narrower than A. Catulli, as that species is 

 now defined. 



A specimen in the British Museum (Xat. Hist.), B. 16470, 

 identifiable with this species, has the vascular markings widely 

 separate and feeble. 



