468 MR. b. 1. BROWNE ON [Mar. 17, 
Plymouth.—Garstang (1894) has recorded this medusa for 
Plymouth. It was taken on a few occasions during April 1894. 
Mr. E. J. Allen kindly sent me five specimens alive, on March 
19th, 1895. 
Two possessed a single tentacle and three had two tentacles. 
Medusa-buds were present at the base of the tentacles in some of 
the specimens. The five specimens showed a great variation in 
colour: one had the endoderm of both tentacles of a pinkish colour ; 
two specimens had the mouth, tentacle-bulbs, and medusa-buds of 
a brilliant crimson colour, and another specimen with the same 
parts coloured reddish orange. One specimen showed the mouth 
and tentacle-bulbs of a crimson colour and the medusa-buds 
colourless. 
DISTRIBUTION :— 
Hydroid Form. 
North America, Massachusetts Bay, Agassiz. 
Medusoid Form. 
Iceland, Steenstrup. Norway, Sars. Heligoland, Bohm. France, 
Granville, Haeckel. 
Scotland—St. Andrews, Crawford. 
England—Plymouth, Garstang and Allen. Isle of Man, Browne. 
Ireland—Dublin Coast, Greene. Valencia Island, #. 7. B. 
Fam. HYDROLARIDA. 
LAR SABELLARUM, Gosse. (Plate XVI. figs. 3, 4.) 
Hydroid form. 
Lar sabellarum, Gosse (1857); Hincks * (1872); Allman (1872). 
Medusoid Form. 
Willsia stellata, Forbes (1848); Cocks (1849); Peach (1849) ; 
Gosse (1853). 
Willia stellata, Agassiz (1862); Haeckel (1879); M‘Intosh 
(1890) ; Garstang (1894). 
The remarkable hydroid Zar sabellarwm was first described by 
Gosse (1857) from a colony, found growing upon the tube of a 
Sabella, in an aquarium. ‘The odd appearance of the hydroid and 
the absence of gonophores justified Allman’s statement, ‘“‘ We are 
almost tempted to regard it as an abnormal condition of some other 
form.” Fifteen years after its first appearance in Gosse’s aquarium 
another colony was dredged by Hincks at Ilfracombe. Hincks 
(1872) not only confirms the description given by Gosse, but de- 
scribes the reproduction in the following words :— 
“The fertile polypites of Zar are distributed along the creeping 
stolon, amongst the alimentary zooids, and bear a strong general 
resemblance to those of Hydractinia. They are slender, somewhat 
filiform bodies, destitute of tentacula, and terminated at the free 
extremity by a globular enlargement, in which many thread-cells 
are imbedded; they are generally inferior in size to the alimentary 
