SERTULARIAD^ : SERTULARIA. 79 



Cape of Good Hope, which differ in no respect from those of our 

 shores. 



" I have collected a few examples of a black, as well as many of a 

 red colour." W. Thovipson. 



16, S. ARGENTEA, 'polyjiidom cauliferous ; cells nearly oppo- 

 site or suhalternate^ urceolate, acutely pointed^ tlie upper half 

 divaricated ; vesicles oval. Merret. 



Plate XV. and Plate XIV. Fig. 3, 3. 



Corallina comis ad instar caudffi vulpinae sparsis. — Sheep's tailed Coralline, Merr. Pin. 

 29. — Corallina muscosa, altema vice denticulata, ramulis in creberrima capillamenta 

 sparsis, Raii Syn. i. 36, No. 17. — Musciis marinus denticulatus minor ramulis in 

 creberrima capillamenta sparsis, Plukrmt Phytog. tab. 48, fig. 3.— Muscus marinus 

 minor denticulis altemis, Morris. Hist. Plant. Oxon. iii. 650, tab. 9, fig. 4. — 

 Squirrel's-tail, Ellis Corall. 6, No. 4, pi. 2, fig. c, C. — Sertularia cupressina, iS, 

 Liii. Syst. 1308. — S. cupressina, Espcr Pflanz. Sert. tab. 3, fig. 1, 2. — S. ar- 

 gentea, Ellis and Soland. Zooph. 38. Berk. Syn. i. 216. Esper Pflanz. Sert. 

 tab. 27, fig. 1,2. Lam. Anim. s. Vert. ii. 117. Lamour. Cor. Flex. 192. John- 

 ston in Trans. Newc. Soc. ii. 258, pi. xi. fig. 4. — Hassall in Ann. and Mag. Nat. 

 Hist. vi. 168. Couch Zooph. Comw. 10: Corn. Faun. iii. 25. — Dynamena ar- 

 gentea, Flem. Brit. Anim. 544. 



Hah. — In deep water. On oysters and other large bivalved shells, 

 as also on the stalk of Laminaria digitata, common, and frequently 

 met with in closely aggregated clusters. " Grows occasionally in 

 brackish water, and in shallow pools. I have found it, in some 

 quantity, attached to dead mussels, in a shallow pool in Dundrum 

 Bay, CO. Down, into which a river flows. A mass of it was once 

 brought to me from one of the flood-gates of a dock in Belfast, to 

 which it was found attached." — W. Thovipson. 



Polypidom from six to eighteen inches high, cauliferous, the stem 

 percurrent, filiform, waved or straight, smooth, of a dark -brown 

 colour, divided at rather wide but regular intervals by an oblique 

 joint, clothed with short panicled dichotomous branches which 

 spread out on every side, and being all of the same size or nearly so 

 (excepting at the bottom where they are less branched and smaller, 

 and at the top where they also frequently become gradually short- 

 ened), the whole coralline assumes somewhat of the shape of a squir- 

 rel's tail, and has given origin to its English name. Two branches 

 usually arise from each internode of the stem, and they come off" in 

 such a manner that four or five of them complete a whorl. The 

 polype-cells on the stem are alternate, appressed, and appear to be 

 less than those on the branches, which are placed in two rows with 



