26 



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

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

 this variety, frequently bends from tlic straight line at an 

 ohtnse angle. In young and newly formed parts the colour 

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

 yellow and finally lo 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 vasifornj. 



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

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

 no. 5. Turton's Lin., vol. 4, p. (JG7. Stewarl's Elem., 

 vol. 2, p. 442. Teuipleton in Maij. Nat. Hist., vol. 9, p. 4(>8. 

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

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



Hah. 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 slisj;litly 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, oa 

 each side of the pinnae. The vesicles are vasiform with 

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

 the base of the 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 fpiite 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 lo this I have observed that 



