THE HYDROIDS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 71 



out their course, while the intermediate portions are more or less corrugated. A 

 delicate chitinous envelope surrounds the coenosarc and is adorned with minute sand 

 particles, fragments of sponge spicules, etc., this coating being continued over the lower 

 part of the hydranth. The hydranths, which are in poor condition, appear to be rather 

 globular in shape and have from 12 to 15 tentacles. Short-stalked gonophores occur 

 scattered over the hydrocaulus, but they are far from mature and offer no characters of 

 significance. 



I have no hesitation in identifying my specimens with those collected by Paessler 

 at Port Stanley in 1895 and described by Hartlaub (1905, p. 530), although our 

 examples bear more numerous branches than his " gar nicht oder nur schwach 

 verzweigten Hydrocauli." And I follow Hartlaub, but with considerable hesitation, in 

 referring the colonies to the Perigoniinus repens of Wright, an almost unbranched form 

 with a maximum height of "^ inch" (Hincks, 1868, p. 90), contenting myself merely 

 with adding a second mark of interrogation to that which expresses Hartlaub's doubt. 



Locality. — Growing on an encrusting Polyzoon, from seaweed found on the shore at 

 Port Stanley, Falkland Islands. January 1903. 



Clytia johnstoni (Alder, 1857). 



Of this common European species only a few stems occur on Saragassum weed. 

 They resemble miniature British examples of C. johnstoni, structurally alike in every 

 detail, but altogether on a much smaller scale. They are even less in some measure- 

 ments than the small variety found by Dr Billard (1907,^^^ p. 168) on material from the 

 Saragassum Sea. 



Measurements : — 



Stem, length . . . . . .1-6 -2-1 mm. 



„ diameter ..... 0-63-0-71 „ 



Hydrotlieca, length ..... 0-66-0-7 „ 



„ diameter at margin . . . 0'41-0'48 



Locality. — Off Saragassum weed, from lat. 27° 54' N., long. 33° 17' W. 28th June 

 1904. 



Camixmularia clytioides (Lamouroux, 1824). 



Several specimens of this minute species have been found creeping on Saragassum 

 fronds. The stems are short, measuring from 074 mm. to 0"95 mm. in length and O'l 

 mm. in diameter, and are marked by about eight compact rings at the base of the 

 hydrocaulus and about six less compact rings beneath the hydrotheca. The inter- 

 mediate portion of the stem is smooth or only slightly corrugated. The hydrothecse are 

 short (0'34 mm.), rather broad at the mouth (0"38 mm.), and taper rapidly to the base. 

 Their walls are thick, but vary considerably in different individuals and even in the 

 various parts of the same individual. At the margin of the shelf which divides the 



