﻿part 4] PHILLIPS ASTHMA HENNAHI, AJTD ORIONASTRMA, 301 



Notes upon the Holotype of the Species in the Sedg- 

 wick Museum, Cambridge, No. 211, presented to 

 the Collection by W. Hopkins. (PL XXIII, figs. 6 

 &7.) 



The type-specimen of Sarcinula placenta McCoy is part of 

 a depressed corallum measuring some 6 by 4 cm., and is about 

 2 cm. thick. Both the upper and the lower surfaces are re- 

 markably flat. For the greater part, the coral interstices are free 

 from mineral deposit, and consequently the material is very friable. 

 Along certain planes, however, it is highly silicified, being then 

 converted into thin bands of chert. Superficially, the fossil is 

 stained a deep red. 



The thecse measure about 2 mm. in diameter, and are fairly 

 regularly spaced, the interval between them averaging 4 to 5 mm. 

 None of the septa invade the intrathecal region, and there is no 

 columella. In consequence of the absence of a columella, the 

 tabulae are concave, but are somewhat irregular in habit. 



In this specimen it may be observed that the thecal are some- 

 what smaller than in the average examples, and the number of 

 septa correspondingly less — about 25. 



Attention must be drawn to the striking resemblance of this 

 type to Martin's figure of Erismatolithus radiatus. In mode of 

 preservation it would seem identical with the specimen illustrated 

 in 'Petrificata Derbiensia.' Unfortunately, since we know nothing 

 of the intrathecal character of Martin's coral, it is impossible to 

 identify McCoy's type with Martin's figure, although the pre- 

 sumption is that they are the same. 



Oeionaste^a ensifer (Edwards & Haime). 



1851. Lithostrotion ensifer H. Milne Edwards & J. Haime, ' Polypiers Fossiles 



des Terrains Paleozoiques ' p. 442. 



1852. Lithostrotion ensifer H. Milne Edwards & J. Haime, ' Monograph of 



the British Fossil Corals ' Pal. Soc. p. 193 & pi. xxxvii, figs. 2, 2 a. 

 1889. Fhillipsastrcea radiata (Martin), partim R. Schafer, Geol. Mag. dec. 3, 



vol. vi, pp. 401-407 & pi. xii, figs. 2, 5, ? 6. 

 1903. Lithostrotion ensifer Edwards & Haime, A. Vaughan, Proc. Bristol Nat. 



Soc. n. s. vol. x, p. 109. 

 1905. Lithostrotion ensifer Edwards & Haime, A. Vaughan, Q. J. G. S. vol. lxi, 



p. 199. 



The specimens upon which Edwards & Haime established the 

 species came from Bristol, and were preserved in the British 

 Museum. The identification of these is not possible ; nevertheless, 

 there are several specimens which were in that collection at the time 

 when these authors were engaged upon their researches. The figures- 

 and descriptions given by them leave no room for doubt as to the 

 identity of the species. They drew attention to its resemblance 

 to ' Phillipsastrcea ' (that is, Orionastrcea), and remarked that 

 ' in this fossil the columella is more prominent than in any other 

 species of the same genus, and the walls much thinner.' I cannot 

 quite agree with the statement concerning the columella, although 



