alternate manner ; the stem is slightly zig-zag with a few dis- 

 tantly arranged cells on it. The upper part of the stem, in 

 this variety, frequently bends from the straight line at an 

 obtuse angle. In young and newly formed parts the colour 

 is of a pure silvery white, which changes with age to a straw 

 yellow and finally to a brown colour. 



SEA CYPRESS. S. Cupressina. Polypidom cauliferous ; 

 cells nearly opposite, tubulous, adnate ; aperture large 

 and not everted, with one large and two small lateral 

 teeth. Vesicles vasiform. 



Sea Cypress. Ellis' Coral., p. 7, no. 5, tab. 3, fig. a A. 

 Sertularia Cupressina, Ellis and Solander's Zooph., p. 38, 

 no. 5. Turton's Lin., vol. 4, p. 667. Stewart's Elem., 

 vol. 2, p. 442. Templeton in Ma?. Nat. Hist., vol. 9, p. 468. 

 Johnston's Brit. Zooph., p. 135, pi. xiii. Dynacuena Cu- 

 pressina, Fleming's Brit. An., p. 543. 



Hab. St. Ives bay. 



The only Cornish locality from which this species has 

 been obtained is St. Ives bay ; from which I have procured 

 three specimens. It is stouter and more spiry than the last. 

 The stem is stout and gradually tapers from the base to the 

 apex ; and is slightly zig-zag, which is made more apparent 

 by the pinnae falling off and leaving a slight protuberance. 

 The pinnae are alternate and branched, the branches hanging 

 nearly parallel to each other. The cells are biserial, closely 

 arranged and semi-alternate or opposite; they are smooth, 

 and closely adherent; the base slightly bulging; the aper- 

 tures look upward, are patulous and armed with a long tooth 

 on the outer, with two smaller ones on the lateral edge, on 

 each side of the pinna?. The vesicles are vasiform with 

 short peduncles; their apertures, small and tubular, and at 

 the base of Ibe neck are two large spines, which however are 

 occasionally absent. The vesicles are sometimes so abun- 

 dantly produced on the upper edges of the pinnae, as to bend 

 them into arches, which gives the polypidom a peculiarly 

 graceful appearance. 



This species bears so close a resemblance to the last, that 

 Pallas considered them to be no more than varieties of the 

 same, and in this opinion he was followed by Linnaeus. But 

 Ellis in his work edited by Solander, opposes such an 

 opinion. He says, "these last two Corallines, though 

 supposed by Linnaeus to be the same, when they come to be 

 compared, have quite a different habit and manner of growing. 

 The latter or Sea Cypress is always found in very deep 

 water, and the side branches often as long again as the 

 Squirrel's Tail." In addition to this I have observed that 



