Vol. 62.] BR\CHIOPOD HOMCEOiiORPHY. 443 



Antinomia angusta, Catullo, 1851. (PI. XL1, fig. 7.) 



Antinomic angusta, Catullo. Terebratula dilatata ; PictPt. pi. xxxii, fig. 5 [6], 1 

 not 5 a, 5 6. T. angusta; Pictet, p. 202 {pars). r j\ diphya; Quenstedt, 

 1871, pi. xlvii, fig. 123. 



A species from the Upper Diphya-Ksiik (Pictet 29] p. 175). 



Subtriangulate. 

 Axtixomia Qtjexstedti, nom. nov. 



Terebratula diphya ; Quenstedt, 1871, pi. xlvii, fig. 115 (type). Pygojie triquetra ; 

 Douville, 1880, p. 268. 



A well-marked form, similar to A. Catulli, but smaller and 

 stouter. Evidently it did not attain so large a size, for it shows 

 the gerontic feature of thickened margin at a stage when A. Catulli 

 is still growing normally. 



There is a specimen in the British lEuseum (Nat. Hist.), B. 188, 

 so exactly agreeing with Quenstedt's figures that I deem it desirable 

 to give the form a name. Another example there (B. 8687) is a 

 little smaller, but has an almost equally thickened margin. 



Suboblong. 

 Antixomia sp. (3. 



Terebratula dilatata ; Pictet, 1867, pi. xxxiii, fig. 3. 



Note. — A narrow form, but not triangulate like A. angusta, being 

 nearly as broad posteriorly as anteriorly. Side-margin well curved. 



Securiform=shaped like a battle-axe. 

 Axtinomia triquetra (Parkinsou). 



Terebratulites triquetra, Parkinson, 1811, fig. 4 only. Terebratula antinomia, 

 Catullo, 1827, pi. v, fig. p only. 



Parkinson's figure shows a form with wing-like expansions 

 making a battle-axe shape. Catullo's is similar, but with less pro- 

 nounced wings. Neither figure gives sufficient details for exact 

 determination. 



A specimen in the British Museum, No. 231, exactly agrees with 

 Parkinson's figure and shows the battle-axe shape well. Its margin 

 is but slightly curved, though much indented. 



Antinomia cf. triquetra (Parkinson). (PI. XLI, fig. 9.) 



Terebratula diphya ; Pictet, 1867, pi. xxxi, fig. 2. 



This form has the battle-axe shape like A. triquetra, but is 

 narrower posteriorly and more produced anteriorly. A specimen 



1 Fig. 6 in test, misnumbered in plate. 



