﻿part 4] PHILLIPS ASTR2EA HENNAH1, AND ORIOiVASTR.EA. 



297 



already adduced (pp. 285 et seqq.), these authors restricted the 

 use of A. d'Orbigny's generic name PhilUpsastr&a to these 

 species — by which name they have since been known. 



In the same works (pp. 442-43 and p. 193 respectively) Edwards 

 & Haime described a new species of Lithostrotion (L. ensifer), 

 which I propose to include in the genus Orionastrcea, although 

 acknowledging its equal claim for inclusion in either genus : it 

 constitutes, in fact, the link connecting Orionastrcea phillipsi 

 with the typical forms of Lithostrotion. 



James Thomson, in 1883, ' On the Development & Generic 

 Relation of the Corals of the Carboniferous System of Scotland ' 

 Proc. Phil. Soc. Glasgow, vol. xiv, pp. 394-96, pi. iv, figs. 1, 1 a, 

 lb, lc, & 2, recorded Orionastrcea (as ' Pliillipsastrcea'') from 

 Blackridge (Linlithgowshire), and thus widened its known area of 

 distribution to include Scotland. Moreover, he demonstrated its 

 instability of character by enumerating the varieties that he ob- 

 tained from a very limited horizon at that locality, which he stated 

 Avas the only one in Scotland where the genus had been found. 



He specified four varieties, distinguished by the following 

 characters : — ■ 



1 st variety. Columella absent, tabulse regular. 

 2nd do. do. do. do. irreg-ular. 



3rd do. do. present. 



4th do. do. do. mammilliform surface ( = 8. tubsrosa (McCoy)). 



He illustrated his description by figures of : 



(a) a form in which the counter- septum alone invades the intrathecal 



region, and constitutes a slender and inconstant columella ; 



(b) a form in which several septa unite in the centre of the intrathecal 



region. 



I consider it probable that his varieties 1 & 2 are O. placenta, 

 and that 3 & 4 are O. pliillipsi. 



Rudolph Schafer's (1889) contribution to the literature, ' On 

 Pliillipsastrcea d'Orb., with especial reference to Phillipsastrcea 

 radiata S. Woodward sp. and PJiillipsastrcea tuberosa McCoy 

 sp,' Geol. Mag. dec. 3, vol. vi, pp. 398-409, pi. xii, has already 

 been discussed (p. 287) ; wherefore here I merely desire to 

 draw attention to the text-figures on p. 403, representing calices 

 over the floors of which a number of septa have straggled : 

 the figures are intended to demonstrate the absence of a 

 columella. I admit the accuracy of the figures ; but unfortu- 

 nately they illustrate selected calices, while others of the same 

 specimens in which the columella can be detected have been 

 overlooked. Schafer followed Edwards & Haime in merging 

 McCoy's species 8. phillipsi and 8. placenta, and retaining his 

 8. tuberosa. 



A. Vaughan (1903), ' Notes on the Corals & Brachiopods 

 obtained from the Avon Section & preserved in the Stoddart 

 Collection' Proc. Bristol Nat. Soc. n. s. vol. x, pp. 109-10, included 



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