HORN K It.V VIOLACEA. " 469 



Tin. ooecium in this species varies somewhat in position, 

 but seems to be usually situated near the bifurcation of 

 the branches, either immediately below the division, or at 

 a short distance from it. It is sometimes extremely pro- 

 minent, almost subconical, the sides being carried abruptly 

 upwards to a central point ; in other cases it is more de- 

 pressed. The raised line or rib takes its origin near the 

 free extremity of the tubular orifice, and passes from this 

 point across the ovicell. 



There is some difference in the mode of growth, and 

 specimens occur which are comparatively tall (2 inches) 

 and exhibit a straggling habit ; but so far as I have seen, 

 the compact and somewhat flabellate form is the more 

 usual. 



HABITAT. From moderate depths to deep water. 



LOCALITIES. Shetland (Barlee) : ibid., Outer Haaf, 80- 

 170 fathoms; Hebrides (A. M. N.). 



GEOGRAPHICAL DISTRIBUTION. Waderoarne, Bahusia 

 (Loven) : Norway (Pontoppidan, Strom, Sars (in about 

 40 fathoms), &c.) : Nova Zembla (west), 20-30 fathoms; 

 Kara sea (Stuxberg and Theel) : Greenland (Liitken) : 

 St. George's Banks, 150 fathoms (Smith and Harger). 



HORNERA VIOLACEA, Sars. 

 Plate LXVII. figs. G-8, and Plate LXII. figs. 2, 3. 



HOKXEBA VIOLACEA, Sars, Oeol. og Zool. lagtt. Beiso Trondhj. St. 1862, N. 

 Mag. f. Nat. Vid. xii. 282 (30 sep.) : Smitt (forma violacea), 

 loo. cit. 404 and 467, pi. vi. figs. 6-9 : Norman, Shetland 

 Dredg. Rep., Report Brit. Aeeoc. for 1867 (1868), 310 : Busk, 

 B.M. Cat iii. 18, pi. xviii. fig. 1. 



PUSTULOPORA OHC AUE.Nsis, Bu*k, Quart. Jouru. Micr. Sc. ?iii. (1860), 214, 

 pi. vnii. figs. 1. _'. 



irregularly branched; branches dichotomous, 



