Crisia genieiilata, M.-Edw. I. c. p. ■'>. pi. vi. fig. 1 ; Johnst. p. 286 (no 



tig.); Lmuhb., Gosse, Sam. 

 Crisia cornuta (var.j, Smitt. 

 Filiorisia geniculata, D'Orb. I. c. p. C04. 



Hub. Both shores of the British Channel. 



2. CRISIA, Lamx. 



Two or more cells in each internode ; oou3cia irrcgularlj' placed. 

 Synonymy as under Crisidia. 



Bicrisia (sp.), D'Orb. I. c. p. 601. 



1. Crisia eburnea, Linn. (Plate II. figs. 1, 2, Plate V. 

 figs. 1, 2, 5-10.) 



Zoocecia usually 3-7 in each internode (rarely 9-11), loosely 

 aggregated ; branches usually arising from the lowest zoooecium in 

 the internode ; border of aperture usually circular, sometimes 

 pointed on one side ; oocecium pyriform. 



Sertularia eburnea, Linn., Esper, Jameson. 



"Sertolaria d'avorio," Camlini. 



Cellularia eburnea, Pallas, Bruguiere. 



Cellaria eburnea, Solatid., Bosc, Lamarck ; Johnst. Trans. Newc. Soc. 



ii. p. 262, pi. xi. fig. 5. 

 Ci'isia eburnea, Lamx.; M.-Edw.; Fleming; Johnst. B. Zooph. ; Tem- 



pleton ; Blainv. ; Misso ; Couch ; Hincks ; Norman ; Alder ; Hassall ; 



Macgillvray; Hyndman; Held; Van Beneden, Rech. s. I'Anat. des 



Bryozoa, Mem. Brux. t. xviii. p. 28, pi. iii. figs. 12-16; TfOrh., 



Gosse, SfC. 



Hah. British and Irish coasts ; France ; Mediterranean ; Madeira ; 

 Adriatic ; coasts of Norway ; Spitzbergen ; Shetland. 



Var. ACULEATA. 



Crisia aculeata, Hnss. A. N. Hist. vi. p. 170, pi. 7. fig. 34, and vii. 



p. 366 ; Johnst. I. c. p. 285 ; Busk, Rep. B. Ass. 1859, p. 146. 

 Crisia eburnea, M.-Edw. I. c. p. 198, tab. 6. figs. 2, 2 a. 

 Crisia eburnea (var. cornuta), Smitt, I. c. p. 117. 



The tubular-jointed process described by Dr. HassaU as a " long 

 spinous process " appears to act as a radical tube, serving occasionally 

 as a means of attachment. 



2. Crisia denticulata. (Plate II. figs. 3, 4, Plate III. figs. 1-6, 

 Plate IV. figs. 1-4.) 



Zoocecia almost straight, connate throughout nearly their whole 

 length ; aperture elliptical, usually pointed on one side ; oocecia 

 often truncate, annulated, placed irregularly ; bi'anchcs usually 

 arising from the fourth or fifth cell above the joint (occasionally 

 from the second in the lower part of the zoarium). 



Cellaria denticulata, Laink. 



