514 ZOOPHYTA. CORALLINADiE. Jania. 



Gen. XXXIV. JANIA. — Branches subdividing dichotomous- 

 ly ; filiform, with cylindrical joints. 



78. J. ruhens. — Summits of the lower joints of the stem sim- 

 ple. — Not uncommon on the English, Irish, and Scottish coasts. 



This species is subject to considerable variation in its general appearance 

 and growth, arising from age and station. 



A. Nearly uniform in thickness throughout, branches terminating in short 



bifid processes Corallina ramulis dichotomis, teneris, capillaribus, et ru- 



bentibus, Ellis, Cor. p. 50. No. 5. tab. xxiv. f. e. E — C. rubens, Pallas, El. 

 p. 426. No. 7- 



B. The last joint but one, swollen at the summit, a character more or less 

 conspicuous on the other joints. The terminal ones blunt— C. dichotoma, 

 capillis densis, cristatis, spermophoris, fucis minimis teretibus adnascens, 

 Ellis, Cor. p. 51. No. 7. tab. xxiv. f. f. F — Cor. cristata, Pall. El. p. 425. 

 No. 6 Cor. rubens, Linn. Syst. p. 1304. No. 3. 



C. Joints supporting the two last subdivisions clavate, terminal ones in 

 pairs slender, many -jointed, seldom dividing — Cor. alba spermophoros, ca- 

 pillis, tenuissimis, Ellis, Cor. p. 51. No. 8. tab. xxiv. £ g. G. Both Pallas 

 and Linnaeus make this a variety of var. B — It seems to be in the last stage 

 of growth. The Cor. plumosa nivea, fuco minimo tereti adnascens of £//. 

 Cor. p. 52. No. 9. tab. xxiv. f. h. H. H. 1., the C. globifera of Turt. B. Fauna, 

 No. 701. p. 212, is certainly this species in its first stage of growth, and when 

 it consists of only two or three joints rising from a globular base. Var. A. 

 is the next stage. In some cases, a few of the lower joints are two-homed, 

 like the following species. 



79. J. corniculata. — Summits of the lower joints of the stem 

 subcompressed, and produced on each side. 



Cor. alka exigua, ramulis dichotomis segmentis comiculatis, fucis mini- 

 mis teretibus adnascens, Ellis, Cor. p. 50. No. G. tab. xxiv. f. d. D 



Cor. corn. Pallas, El. p. 424. Linn. Syst. p. 1305 On the English 



coast, Ellis. 



Gen. XXXV. CORALLINA.— Branches subdividing tricho- 

 tomously. In consequence of this mode of growth there 

 is always the appearance of a primary stem, and the sum- 

 mits of the joints are compressed and dilated, except in 

 old specimens, where the lower joints are cyUndrical, and 

 destitute of lateral branches. 



80. C. officinalis. — The short lateral shoots of the branches 

 rounded, and blunt or capitate. 



Cor. anglica, Rail, St. Br, p. 33. Ellis, Cor. p. 48. tab. xxiv. No. 23. a. A. 



A, 1. A. 2. B. B. 1. B. 2.— Cor. offl Pallas and Linnceus. — Common on 



all parts of the coast. 



This is subject to vary greatly in its appearance, according to the station 



it occupies. At certain seasons the heads of the pinnules are enlarged into 



cells, and similar tubercles occur on the sides of the joints, out of which 



Ellis squeezed "little twisted figures." 



