444 mr. s. s. euckman on [Aug. 1906, 



similar to Pictet's is in the British Museum, jSTo. 81055. It has an 

 almost straight side-margin, while the vascular markings are widely 

 separate and fee Vie. 



Subobcordate. 



Antinomia angiJLata, Catullo. 



Antinomia angdlata, Catullo, 1851, p. 75. ? Terebratula dipliya; Queustedt, 

 1871, pi. xlvii, tig. 123. 



Nothing seems to agree with Catullo's figure. It is said to be one- 

 half of the natural size ; if so, the specimen must have been far 

 larger than any others — quite a giant. 



I can only suggest that Catullo's figure is intended to represent a 

 form like that of Quenstedt, pi. xlvii. fig. 123. This shares with 

 Catullo's a peculiarity which separates it from most other forms — the 

 sides (anterior part) run convex, not concave, to make the angles ; an- 

 teriorly the sides converge, instead of diverging. 



Imperforate Stage. 

 Triangulate. 

 Antinomia pileus (Bruguiere) 1792. (PI. XLI, fig. 8.) 



Terebratula pileus, Brug. 1702. Terebratula Ency. Meth. 1797, pi. ccxli, 



fig. 1. T. triquetra, Parkinson, 1811, fig. 8. T. triangulus, Valenciennes in 

 Lamarck, 1819. T. antinomia, Catullo, 1827, pi. v, fig. q ; T. mutica, Catullo, 

 1829. T. triangulus ; von Buch, 1838, copy of Ency. Meth. T. dipliya ; 

 Suess, 1852, pi. xxxi, figs. 16 & 17. T. triangulus ; Quenstedt, 1871, pi. xlviii, 

 figs. 9 & 10. T. triangulus ; Pictet, 1867, pi. xxxiv, figs. (1 ?) 2, 3. 



This is the species which has so long been known as Terebratula 

 triangulus [Valenciennes in] Lamarck ; but Bruguiere's name 

 T. pileus, which has been quite overlooked, is nearly 30 years older, 

 and therefore takes precedence. 



In the British Museum (Nat. Hist.) are two good examples 

 (B. 8686 ; B. 15031), and there are other imperfect specimens. • 



It may be that, under this name, I have combined what are really 

 imperforate forms of more than one series ; for some figures and 

 specimens show a nearly straight margin, but in Bruguiere's figure 

 it is distinctly curved. 



I have not been able to detect in any examples the least sign of a 

 scar, or of irregularity of growth-lines such as would be expected. 



Antinomia equicampesteis (Guembel). 



Terebratula equicampestris , Guembel, 1861, p. 563 (description only). 



This is, from the description, presumably an Antinomia like 

 A. pileus in general form, and having the peculiar, laterally-flattened, 

 even furrowed, side-margin. The coarse, distant growth-ridges 

 would separate the species from A. pileus ; but this character is seen 

 in Terebratula euganeensis, a species which has not the flattened 

 side-margin. 



