52 CELLULARIIIXffi. 



The intcrnodes in this species are remarkable for their 

 length, consisting frequently of as many as 20 cells. The 

 habit is sometimes stout and massive, and the tufts short 

 and compact ; but I have a beautiful variety from Guern- 

 sey, in which the shoots arc more slender and rise to a 

 height of | inch. 



On the lower segments an immense number of smooth 

 and slender fibres are given off from the vibracular cells, 

 which tend downwards and become adherent. 



SCRUPOCELLAEIA REPTANS, LilinSBUS. 

 Plate VII. figs. 1-7. 



CREEPING CORALLINE, Ellis, Corall. 37, no. 3, pi. xx. fig. b, B. 



SERTULARIA REPTANS, Linn. Syst. (ed. 12), 1315. 



CELLVLAKIA REPTANS, Pall. Elench. 73: Reid, Ann. N. H. Dec. 1845, 385, 



pi. xii. figs. 1-5 : Johnst. B. Z. ed. 2, i. 337, pi. Iviii. figs. 3, 4 : 



Dalyell, Hem. An. i. 235, pi. xly. : Smitt, Kritisk Forteckn. 



iii. (1867), 284 &318, pi. xvii. figs. 37-41. 

 SERTULARIA REPENS, Berkenhout, Synops. i. 220 (1789). 

 CELLARIA REPTANS, EU. Sf Sol. Zooph. 23 : Lamk. An. s. Vert. (ed. 2), ii. 191. 

 SCRUPARIA REPTANS, Oken, Lehrb. Naturg. Abth. ii.'OO. 

 CBISIA REPTANS, Lamx. Pol. corall. flex. 60. 

 ACAMARCHIS G-EOFFROYI, Audouin, Expl. i. 241 : Savigny, Egypte, pi. xi. 



fig- 4. 



BICELLARIA REPTANS, Blainv. Act inol. 459. 

 SCEUPOCELLARIA REPTANS, Gray, B.M. Cat. Kad. 112. 

 CANDA REPTANS, Eusk, B.M. Cat. i. 26, pi. xxi. figs. 3, 4. 



Zoarium creeping, branches divided dichotomously into 

 numerous segments, broadly expanded, flabelliform. 

 Zooecia biserial, alternate, ovate, produced and narrowed 

 below; aperture oval, occupying about two thirds of 

 the front, with a somewhat thickened rim, three pointed 

 spines on the outer side at the top and one opposite to 

 them on the inner side ; a branched pedunculate oper- 

 culum rising from the inner margin. Sessile avicula- 

 rium on the outer edge, placed at the very top of the 

 cell, minute, and set back behind the spines ; at the 



