70 



MR JAMES RITCHIE : SUPPLEMENTARY REPORT ON 



Locality. Growing amongst seaweed on the leg of a masked crab. Station 81, 

 Abrohlos Bank, Brazil. Lat. 18 24' S., long. 37 58' W. Depth, 36 fathoms. 

 Bottom deposit, coral. 20th December 1902. 



Antenella quadriaurita* sp. nov. 



A few sparse colonies which cannot be referred to any described species of Antenella 

 were trawled off Gough Island. The stems, the largest of which is 14 mm. high, are 

 hairlike and stand out rigidly from a creeping stolon like a group of stiff bristles. To 

 the unaided eye the stem groups much resemble the figure of A. gracilis given by 

 ALLMAN (1877, pi. xxii, fig. 6), but in our specimens the stems are more delicate, and, 



FIG. 9. Antenella quadriaurita. (a) Portion of stem, x 25. (i) Anterior aspect of a hydrotheca. 



(c) Lateral aspect of a hydrotheca. x 125. 



x 125. 



owing perhaps to mere accident, they are more irregular in size and more straggling in 

 arrangement. The stem is divided into a series of alternating thecate and athecate 

 internodes, the boundary lines between these being oblique and very distinct on the 

 proximal side of the thecate internode, and on the distal, transverse but faintly indicated. 

 On the stems examined the maximum number of hydrothecse was nine, but that a 

 greater number may be borne is likely, as in both the " nine " colonies the stem was 

 incomplete. The hydrothecse are borne on every other internode. As seen in profile 

 they are cylindrical, having almost parallel edges, but viewed from in front they seem 

 to be conical in shape, tapering rapidly to the base. A hydrotheca is rather deeper 

 than broad, and for more than half its height is free from the internode. Its profile is 

 straight, and its margin is very slightly everted. 



Each thecate internode bears five nematophores : one median, placed on a gently 



* Qiutttiior, four ; and auritus, eared, signifying the presence of two pairs of nematothecae flanking the hydrotheca. 



(ROY. soc. EDIN. TBANS., VOL. XLVII., 92.) 



