284 POLYZOA INFUNDIBULATA. 



Cellaria eburnea, Ellis and Soland. Zooph. 24. Bosc Vers. iii. 133. Lam. 

 Anim. s. Vert. iL 138 : 2de edit. ii. 184. Johnston in Trans. Newc. Soc. ii. 262, 

 pi. xi. fig. 5. Crisia eburnea, Lamour. Cor. flex. 138. Corall. 60. Expos. 

 Method. 6. Flem. Brit. Anim. 540. Templeton in Mag. Nat. Hist. ix. 468. 

 Blainv. Actinolog. 460, pi. 78, fig. 3. Risso 1'Europ. Merid. v. 313. Couch Zooph. 

 Cornw. 41 : Corn. Faun. iii. 99, pi. 1 8, fig. 2. 



Hah. Parasitical or sea-weeds and on other Zoophytes, very com- 

 mon. " This species appears on algae from California in my collec- 

 tion," W. Thompson. 



Grows in little bushy tufts of ivory whiteness, frequently tinted 

 with rose-red, from a quarter to fully an inch in height, attached by 

 a few capillary fibres dilated at their points of insertion into minute 

 calcareous bulbs. Polypidom much branched, the primary divisions 

 alternate, spreading ; the secondary from one side only and bending 

 inwards with a slight curve. Cells in two rows, semi-alternate, 

 sometimes nearly opposite, tubular but narrowed at the base, the 

 walls transparent and granulous, the aperture circular, somewhat 

 oblique, with an even and entire rim. There are from two to five, 

 sometimes seven and very rarely even nine, cells in each internodial 

 space, the articulation itself being short and flexible. The ovarian 

 vesicles are pear-shaped, granulous, sparingly produced, and scattered 

 on the polypidom. 



Under a high magnifier the granules of the cells and vesicles have 

 an appearance which induces us to compare them to the stomata 

 on the leaves of plants. They are, as my friend Mr. T. GK Ry- 

 land correctly advises me, oval in form and arranged lengthwise on 

 very fine lines or strias ; and so set that the granules of one line 

 alternate with those of the next to it. Whether these granules are 

 " vesicular discs," as Mr. Ryland believes, is I think very doubtful ; 

 but it may be conjectured that they serve to admit the circumfluent 

 water into the interior of the cell. 



2. 0. DENTICULATA, " cells closely aggregated, cylindrical, 

 nearly straight, with short tubular orifices ; joints Hack." 

 Rev. J. Fleming. 



PLATE L. FIG. 5, 6. 



Cellaria denticulata, Lam. Anim. s. Vert. ii. 137 : 2de edit. ii. 182. Crisia luxata, 

 Flem. Brit. Anim. 540. Blainv. Actinolog. 460. Johns. Brit. Zooph. 262. 

 Thompson in Ann. Nat. Hist. v. 252. Couch Zooph. Cornw. 42 : Corn. Faun. iii. 

 99, pi. 18, fig. 3. Macgilliway in Ann. and Mag. N. Hist, ix, 4G6. Crisie den- 

 telee, M. Edwards in Ann. des Sc. Nat. n. s. ix. 201, pi. 7, fig. 1. Crisia pata- 

 gonica ? IfOrligny. 



