746 DR. J. E. GRAY ON ANTARCTIC CORALS. [June 18, 



Thouarella Antarctica. (Plate LXIV. figs. 1-3.) 



Coral branched, of bright yellow colour ; branches few, of very 

 unequal length, of elongated cylindrical shape, each being surrounded 

 on all sides by very numerous club-shaped branchlets, each ending 

 in a polype. The branches of unequal length, and the branchlets, 

 make it like a cylindrical bottle-brush which is rather attenuated to- 

 wards the tip. 



Primnoa antarctica, Valenc. Voy. Ven. t. xii. f. 2. 



Thouarella antarctica, Gray, Cat. Lithophytes in B.M. p. 45 ; 

 Ann. & Mag. Nat. Hist. 1872, ix. p. 482. 



Hab. Falkland Islands, on Burwood Bank, in 45 fathoms, very 

 abundant (Capt. James Clark, R.N.R.). 



This species was first described by M. Valenciennes iu the 'Voy- 

 age of the Venus,' t. xii. f. 2, from a specimen found by Admiral 

 Dupetit Thouars. The specimen was from the Falkland Islands. 

 The specimen figured is small and very imperfect, and would scarcely 

 give an idea of this beautiful coral, which Captain Clark found 

 very abundant. The specimen in the Museum has one branch 

 18 inches long, and gives quite a different idea from M. Valenciennes's 

 figure. Mr. Carter has kindly examined the cells under the micro- 

 scope, and observes that they are formed of oval imbricated scales, 

 lacerated on the edge, with radiating lines and scattered circular 

 dots of a calcareous secretion. Unfortunately these scales are very 

 deciduous. 



PORELLA ANTARCTICA. (Plate LXIV. fig. 4.) 



Coral fan-shaped, thick, rather compressed, divided into several 

 branches, some simple and gradually tapering, the others more or 

 less furcately divided ; of a bright crimson colour, with the more 

 compressed forked tips paler, whitish. 



Porella antarctica, Gray, Ann. & Mag. Nat. Hist. ix. p. 482, 1872. 



Hab. Falkland Islands, on Burwood Bank, lat. 54° 27' S., long. 

 59° 40' W., in 45 fathoms {Capt. James Clark, R.N.R.). B.M. 



Nearly allied to Porella cervicornis of the British seas. 



Dr. Joseph Hooker, who accompanied Ross during his Antarctic 

 voyage, made a series of the drawings of the animals which they 

 observed. No. 255 of these drawings represents a new species of 

 PrimnoadcB, which I described in the ' Catalogue of Stony Corals in 

 the British Museum,' p. 45, under the name of 



HOOKERELLA PULCHELLA. (Plate LXIII. figS. 1-3.) 



Hookerella pulchella, Gray, Cat. Lith. B. M. p. 45. 



The coral was 2 inches high, and was obtained in the Antarctic 

 Ocean. 



The coral is erect, fan-shaped, pinnate ; branches simple, nearly 

 parallel; bark and polype-cells covered with large imbricate scales ; 

 polype-cells bell-shaped, contracted at the base, open and fringed, 

 with larger scales at the mouths, in close series on the upper and 

 lower sides of the branches, opposite to each other. 



