CmSIA EBUIINEA. 421 



" Sertolario d'avorio," Cavolini, Mem. d. Pol. mar. 240, pi. ix. figs. 5, 6. 



Cellularia eburnea, Pallas, Elench. 75. 



Cellaria eburnea, Ellis cf- Sol. Zooph. 24 : La7nk. An. s. Vert. ed. 2, ii. 

 184. 



Crisia eburnea, Lamx. Pol. corall. flex. 138 : Flem. B. A. 540 : Johnst. 

 Br. Zooph. ed. 2, 283, wooodcut, fig. 62, pi. 1. figs. 3, 4 : 

 Eeid, Anil. N. H. xvi. (1845), 385 : Van Ben. Eecberches, 

 Mdm. Briix. xviii. 28, pi. iii. figs. 12-16 : Milne-Edwards, 

 Ann. Sc. Nat. ii. Zool. 198, pi. vi. figs. 2,2 a (=var. aculeata): 

 Smitt, CEfv. K. Vet.-Ak. Forh. 1864, 117 & 132, pi. xvi. 

 figs. 7-19 ; var. cornuta {—C. aculeata, Hass.), loc. cit. 117 & 

 133 : &e. &c. 



Ckisia aculeata, Hassall, Ann. N. H. vi. (1841), 170, pi. vii. figs. 3,4: 

 Johnst. B. Z. ed. 2, 285. 



? Ckisia producta, Smitt, loc. cit. 116 & 131, pi. xvi. figs. 4, 5, 6. 



Crisia Haueri, Eeuss {fide Manzoni), Foss. Polyp, d. Wiener Tertiarbeck. 

 54, pi. vii. figs. 22-24 ; Fauna deutsch. Oberoligocans, ii. 

 54, pi. XV. figs. 6-8. 



Zoarium forming small bushy tufts^ of ivory whiteness^ 

 much branched^ branches usually originating from the 

 lowest cell in the internode, occasionally higher up, 

 curled inwards. Zocecia alternate, minutely speckled, 

 more or less curved, almost entirely adnate, with a cir- 

 cular orifice very slightly bent forwards, frequently a 

 pointed projection on the outer side; 3-9 cells in an 

 internode; joints horn-coloured or (sometimes) black. 

 Ooscia pyriform, adnate, thickly punctate, irregularly 

 distributed, with a projecting tubular orifice in the 

 adult state. 



Height from j to 1 inch. 



Var. a {aculeata, Hassall). With a long, slender spine on 

 the outer side of the zooecia, near the top. 



Var. /3 {producta, Smitt). Zocecia more or less straight, 

 elongated, the orifice directed upwards. 



Habitat. On Algse and zoophytes (chiefly), stones, &c., 

 from tide-marks to deep water (170 fathoms in Shetland). 

 Localities. Generally distributed on our coasts. Var. « 

 {aculeata). Kingstown Harbour; Brighton (Hassall): 

 Antrim, 47 fathoms (Swanston) : Ayrshire (W. T.) : Shct- 



