468 MB. m. t. BUoWsB oif [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 

 19tb, 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 endoderra 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 

 colom-less. 



DlSTBIDUTION : — 



Hydroid Form. 

 North America, Massachusetts Bay, Ayassiz. 



Medtisoid Form. 

 Icehad, Steenstrup, Norway, /Sars. Heligoland, Bb7tm. France, 

 Granville, HaecJcel. 



Scotland — St. Andrews, Crawford. 



England — Plymouth, Garstmiy and Allen. Isle of Man, Browne. 



Ireland — Dublin Coast, Oreene. Valencia Island, E. T. B. 



I'am. II YDHOL AKID^. 



Lae sabellabum, Gosse. (Plate XVI. figs. 3, 4.) 

 Hydroid form. 



Lar sabdlarum, Gosse (1857) ; Hincks * (1872) ; Allman (1872). 

 Medtisoid Form. 



Willsia stellata, Forbes (1848) ; Cocks (1849) ; Peach (1849) ; 

 Gosse (1853). 



Willia stellata, Agassiz (18G2); Ilaeckel (1879); M'Intosh 

 (1890) ; Garstang (1894). 



The remarkable hydroid Lar sahellarum was first described by 

 Gosse (1857) from a colony, found growing upon the tube of a 

 Sahella, in an aquarium. The odd appearance of the hydroid and 

 the absence of gonophores justified AUman's statement, " We are 

 almost tempted to regard it as an abuoiunal condition of some other 

 form." Fifteen years after its first appearance in Gosse's aquarium 

 another colony was dredged by llincks at Ilfracombe. Hincks 

 (1872) not only confirms the description given by Qosse, but de- 

 scribes the reproduction in the following words : — • 



" The fertile polypites of Lar are distributed along the creeping 

 stolon, amongst the alimentary zooids, and bear a strong general 

 resemblance to those of Hydraclinia. They are slender, somewhat 

 filiform bodies, destitute of tentaeula, 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 



