4 PROFESSOR J. A. THOMSON AND MR JAMES RITCHIE 



branches in at least three directions, by the origin of twigs on all sides of the axis, by 

 the cylindrical shape of the axis, and by the detailed speculation of the polyps. 



Localities. Burdwood Bank, 56 fathoms, December 1, 1903; Gough Island, 100 

 fathoms, April 22, 1904 ; St Helena, 



Amphilaphis regularis, Wright and Studer, PL II. fig. 5. 



Numerous fine specimens of this graceful form were obtained from St Helena. The 

 following measurements of height and lateral expansion were taken in cm. : 40 by 25, 

 33 by 15, 26 by 15, 20 by 30, 17 by 9, 20 by 19, 20 by 10, 16 by 11 ; but none of 

 these represent complete specimens. As is the case with TJiouarella brucei, there are 

 very noticeable differences in the vigour of the various specimens, for some have the 

 polyps much more crowded than others. 



The specimens agree closely with the description by WRIGHT and STUDER, but it 

 may be noted that the figures of the spicules given in the Challenger Report do not 

 show the prominent spines described in the text. We have therefore given a 

 supplementary figure. 



We add a few details in reference to the spicules. The scales of the operculum 

 are roughly triangular, usually with an indentation in the base directly opposite the 

 nucleus. A strong ridge, sometimes double, extends from the apex of the triangle 

 towards the nucleus, which, however, it seldom reaches. The calyx scales resemble a 

 rude ellipse, toward the upper edge of which the tubercles have become fused to form 

 prominent ridges, frequently 0'08 to O'l mm. in length, radiating from the nucleus and 

 projecting as spines beyond the edge. The arrangement of the ridges resembles that of 

 the teeth in a comb. 



The specimens bear numerous small Actinians, clusters of Polyzoa, clambering 

 Ophiuroids, serpuloid worm-tubes, small barnacles, etc. 



Locality. St Helena. 



Primnoella scotise, n. sp., PL II. figs. 3 and 8. 



A simple upright colony, 105 mm. in height, of a dirty yellowish-white colour. 

 The basal portion is absent and the axis has disappeared. It looks as if the dredge had 

 dragged the colony from off the axis, for there is a slightly oval central canal, a little 

 over 1 mm. in diameter at the base and narrowing to 0'5 mm. towards the apex. 



The stem is closely covered with polyps arranged in whorls of 9 to 11, the most 

 frequent number being ten. The calices are closely apposed to the stem and are 

 pressed against one another laterally, and the whorls themselves overlap, so that the 

 general effect is that of a uniformly thick rod with a diameter of 4 mm. 



The calices are from 2 '5 to 3 mm. long and 1 mm. broad, but owing to the over- 

 lapping at the base less than 2 mm. of the calyx is visible. Under the lens the 



(ROY. soc. EDIN. TRANS., VOL. XM., 854.) 



