PALMICELLAUIA SKENEI. 379 



aperture rounds somewhat depressed, with a prominent 

 curved rostrum in front, bearing on its upper surface a 

 circular avicularinm. Ocecia unknown. 

 Height y^^ inch. 



Habitat. Deep water. 



Localities. Zetland Seas (E. Forbes): Loch Fyne ; 

 the Minch, 18 to 25 miles north of Burrafirth lighthouse, 

 the most northern point in Shetland, 80-90 fathoms 



(A. M. N.) . 



This is a very elegant species; slender in habit, of a 

 pure whiteness, and remarkable for the neatness and regu- 

 larity of its dichotomous branching. 



It differs from its congeners in having its cells disposed 

 in four longitudinal series ; but the mere number of the 

 rows is not a point of any special importance. 



Palmicellaria Skenei, Ellis and Solander. 



Plate LII. figs. 1-4. 



MiLLEPOKA Skenei, Ell. c|- Sol. Zoopb. 135, 



Cellepora palmata, Flem. B. A. 532. 



Cellepora Skenei, Johmt. B. Z. ed. 2, 297, pi. lii. figs. 6, 7, 8: Busk, B.M. 



Cat. ii. 8S, pi. exxii. 

 EscHARA Skenei, var. tridens, Busk, Ann. N. H. ser. 2, xviii. (1856), 33. 



pi. i. fig. 3: Sars, Beskr. norske Polyz., Vid. Selsk. Cbris- 



tiania, 1862, 147 (9 sep.). 

 Lepralia bicornis. Busk, Crag Pol. 47, pi. viii. figs. 6, 7. 

 DiscopoRA Skenei, forma Escharse auctt. (part.), Sniitt, 1. c. 29 and 179. 



Zoarium rising from a spreading crustaceous base, dicho- 

 tomously branched, of a reddish or yellow colour ; 

 branches somewhat palmate, compressed, or flattened, 

 short, dilated and truncate above, rough and hispid. 

 Zoeecia elongate, subcyliudrical, distinct, and mode- 

 rately convex, elevated towards the upper extremitv, 

 and finely granulated ; orifice arched above, the inferior 



