300 R. F. Tomes— Corals of CricMey Bill. 



with Eeuss's new genus, Heterogyra, together with Symphyllia and 

 Latimceandra." ^ 



I think, however, that, variable as this species may be, some of the 

 so-called varieties will eventually prove to be distinct. When all 

 the young forms of these several varieties have been recognized, 

 and a full series of examples of different ages have been compared 

 and their successive growth traced out, it is more than probable that 

 their distinctive characters will assume a more definite form. 



Thecosmilia Wrighti, Dune, Supp. Brit. Cor. pt. iii. p. 17, pi. v. 

 figs. 1, 2, 3, 4 (1872). 

 Many fragments of this species occur in the Coral-bed at Crickley, 

 but none that I have met with have been sufiiciently perfect to give 

 any indication of the height attained by the corallum, but their 

 straightness and the unfrequency of forked pieces may be taken as 

 suggestive of a tall species. The straightness and parallel arrange- 

 ment of the branches in Prof. Duncan's figure would seem to point 

 to the same conclusion. 



Thecosmilia kamosa, d'Orbig., Prodr. de Paleont. t. i. p. 292. (1850). 



A small species of this genus, of which I have as yet seen but one 

 specimen, appears to resemble the T. ramosa of M. d'Orbigny in 

 the size of its calicos, and in having four cycles of unequal septa. 



To the very brief description of M. d'Orbigny I add the 

 following : — 



Corallites free, much curved, and enlarging slowly. They are 

 very rugose, and each one is incased in a thick epitheca, strongly 

 marked with concentric folds and wrinkles. 



Walls thick, calicos round, but becoming ovoid before dividing 

 into two. Septa irregulai-. The first and second cycles meeting in 

 the centre of the calice, thicken and unite and form an irregular 

 but rather large columella. 



Height of the corallites from one to two inches, diameter of the 

 calices three to four lines. 



It was obtained from the Crickley Coral-zone by my friend Mr. 

 J. W. Kirshaw, F.G.S., and kindly given by him to me. 



IsASTB^A TENUiSTRiATA, Edw. and Haime, Brit. Foss. Cor. pt. ii. 



p. 138, pi. XXX. fig. 1 ; Hist. Nat. des Coral, tom. ii. p. 532 ; 



E. de From. Etude Polyp. Foss. p. 226. 

 AsTREA TENUISTRIATA, M'Coy, Ann. & Mag. Nat. Hist. ser. 2, vol. ii. 



p. 400 (1848). 

 Of this rather remarkable species I have up to the present time 

 only made a superficial examination, but I am led to suspect, from 

 the appearance of some of the calices, that more intimate research 

 would reveal characters not wholly those of typical Isastrcece. On 

 some parts of the calicular surface a distinct flat depressed space is 

 visible between the calices, over which the septa (costge ?) pass, and 

 unite with those of contiguous calices. This species appears, as far 

 as conclusions may be drawn from external appearances only, to 

 hold some affinity with the genus Gonfusastr^sa. 



1 Supp. Brit. Fos. Cor. pt. iii. p. 2, 1872. 



