ALCYONIDIUM HIRSUTUM. 493 



generally described as smooth ; but, though destitute of 

 the prominent imperforate papillae which distinguish the 

 following species, the orifices of the zooecia are marked by 

 very small (but distinct) blunt tubercles. Ellis correctly 

 described it as " full of minute papillae which send forth 

 polypes." 



Dr. Farre, from whom we have an admirable account of 

 its structure, has remarked that the arms are sometimes 

 (as in other cases) much longer on one side than the other, 

 so as to give an obliquely truncate appearance to the 

 tentacular bell. The opercular setae are short and very 

 stout; Smitt gives the number at 12 to 13. The ciliated 

 intertentacular organ, which occurs on Membranipora 

 pilosa and other species, is sometimes met with on A. 

 ydatinosum. 



ALCYONIDIUM HIRSUTUM, Fleming. 



Plate LXX. figs. 4-7. 



ALCYONIUM HIRSCTUM, Flem. B. A. 517. 



ALCYONIDIUM HIRSUTUM, Johnston, B. Z. ed. 2, 360, pi. Ixix. figs. 1. 2 : Couch, 

 Corn. Faun. iii. 133 : Van Ben. (Halodactyle velu), Reoh., 

 M6m. Bruxelles, xriii. 37 (sep.), pi. v. figs. 3-8: Alder, 

 Northumb. Cat. 63 (sep.) : Hincks, Dev. Cat., Ann. N. H. 

 ser. 3, is. 470 (56, sop.) : Gosse, Mar. Zool. pt. 2, 19, fig. 30. 



? ALCYONIUM PALMATUM, Dalyell, Bern. Aniin. ii. 43, pis. XT., xvii. 



CYCLOCM PAPILLOSUM, Hassall, Ann. N. H. vii. 483 : Johnston, B. Z. ed. 2, 

 364, pi. hex. 



ALCYONIDIUM PAPILLOSUM, Smitt, loc. cit. 499 & 516, pi. xii. figs. 20, 21. (Not 

 A. hirsutum, Smitt.) 



Zoarium of rather firmer consistency than the last, in- 

 crusting or erect, compressed, expanded, palmate, much 

 and variously divided, of a yellowish-brown colour; 

 the surface thickly covered with tall, imperforate, coni- 

 cal papilla?, amidst which the slightly prominent zoux-i;il 

 orifices are placed. 



