Mr. S. V. Wood's Catalogue of the Zoophytes from the Crag. 13 



Only one fragment, which however differs from the description 

 at the above reference. My specimen has the tubes alternate, de- 

 pressed, suborbicLilar ; surface rugose, probably porous ; the cells 

 are not adnate, but distant from each other rather more than the 

 diameter of the tubes. 



Fam. TuBULiPORiD^. 

 Cor. Crag. Red Crag. Recent. 



1. Fascicularia aurantium, M. Edw. {LyelVs Elements, p. 304. edit. 

 1838, var. a ; Taylor, Mag. of Nat. Hist. vol. iii. 1830, p. 272. 

 f. 61; id.v&r.p. f. 63). 



Aldbro'. I Sutton. | 



Abundant in the coralline crag. A specimen in my possession 

 measures six inches and a quarter in diameter. 



1. Theonoa ? globosa (Bluraenbachium globosum, Koenig, Icon. Foss. 

 pi. 5. f. 69. Theonoa cristata, M. Edw. MS. Taylor, Mag. 

 Nat. Hist. vol. iii. 1830, p. 273. f. 64 & 65). 

 Sudbourn. | Sutton. | 



In its young state this coral is of a discoidal form with a very 

 short pedicel of attachment ; it then resembles a reversed speci- 

 men of Polyporus, and rarely attains half an inch in diameter. 

 The upper surface exhibits the openings of numerous subpoly- 

 gonal tubes which are most abundant towards the margin ; these 

 tubes converge towards the pedicel as a common centre, and their 

 direction may be sometimes traced along the under surface, which 

 is smooth and entire. The polygonal form of the tubes is pro- 

 bably the result of lateral compression. 



The mode of increase appears to be by gemmules formed upon 

 or near the margin of the disc ; as these enlarge, their horizontal 

 extension is interrupted by the mutual approximation of their 

 edges, which consequently bend upwards, except at the points 

 furthest from the centre of the disc upon which they are formed ; 

 and here, as there is nothing to prevent the free extension 

 of the gemmules, "they project beyond the parent disc, and in 

 a slightly downward direction : each disc is thus twisted into a 

 triangular or subquadrangular form, producing a sort of depressed 

 compartment by the union of the under surfaces which project 

 around in the form of a crest. In this manner the shape pre- 

 sented by the adult coral is ultimately produced, and is either 

 hemispherical or subglobular, according to its place of attach- 

 ment. This polypidom has sometimes a radius of more than two 

 inches. 



1. Heteropora dichotoma, De Blainv. (Man. d'Actinol. p. 417. Ce- 

 riopora dichotoma, Goldf. Pet. 1. 10. f. 9. var. /3. d—f). 

 Ramsholt. | | 



What I conceive to be the young state of this coral is a small 



