﻿30 ME. S. S. BUCKMAX OX BRACHIOPOD [Feb. I908, 



rJiyncha ; Sp. triangularis ; Sp. rhomboidea ; Sp. siihconvoluta, 

 de Kon. ; Sp. convoluta ; Sp. fusiformis. 



Foreign species : — Sp. vespertilio, Sow. ; Sp. avicula. Sow. ; Sp. 

 Strangwayi, Yern. 



Genus Choristites, Fischer. 



(Tj'pe : CJioristites mosquensis, Fischer) 



Xarrow ; short hinge-line ; fine ribs medianly aud laterally. 

 Large dental plates. 



British species : — Ch. mosquensis ; Sp. humerosa. 



Foreign species : — Sp. Grimesi, Hall ; Ch. moscpiensis^ Fischer ; 

 Ch. Sowerbyi, Fischer. 



Genus Teigoxotreta, Koenig. 



(Tj'pe : Trigonotreta StoJcesi, Koenig) 



Coarsely costate Spiriferids. 



The Australian form called ' Spirifer glaher ' may be the cata- 

 genetic development of this genus — at least, it is the smooth 

 development of a coarsely costate form ; and it has dental plates. 



Genus Brachythyris, M'Coy. 



(Type, as figured bj' M'Coy : Spirifera ovalis, Phillips) 



Narrow ; tumid ; hinge-line shorter than breadth of shell ; ribs 

 broad and flat on sides, deficient or wanting on fold. (? Dental 

 plates small or absent.) 



Completely smooth forms are developed. 



British species : — Sp. ovalis ; Sp. lingmfera ; Sp. rhomhoidalis 

 Sp. pinguis ; Sp. ohlatus. 



Sp. Beani, Brown, and Sp). hisidcatus, Sow., probably belong 

 here. 



Genus Martixia, M'Coy. 



The type of this genus requires discussion. M'Coy evidently, 

 from using Martin's name, intended Martin's species Anomites glaber 

 to be the type ; yet he depicted^ a broad form, which he and others 

 considered to be Spirifer glaber. But this broad form is probably 

 a smooth Reticularia ; and to take this as the type would destroy 

 M'Coy's intention. The case may therefore be regarded as one in 

 which there are two genosyntypes — Anomites glaber, Martin, indi- 

 cated by the name, and Spirifer glaber, auctt. non Martin = ? /S/9. 

 latus, Brown, indicated by the figure. From these selection may 

 be made ; and Anomites glaber becomes the genolectotype. Then 

 it may be said : — 



(Tj'pe — genolectotype : Anomites glaber, Martin) 



A series of shells which in costate and levigate stages are only 

 ^ 'Synopsis Char. Carb. Limest. Foss. Ireland' 1.S44, fig. 18, p. 128. 



