ATRACTYLID.E. 



gelatinous envelopes, were mistaken for a mass of minute 

 ova *#**. The medusoids are of great size when com- 

 pared with the very minute polype, and resemble exactly 

 those of Atractylis (Perigonimus] repens. I have not 

 witnessed any further development in them after their 

 separation from the zoophyte." 



Hab. On a shell inhabited by Pagurus Bernhardus, at 

 Granton, Firth of Forth (T. S. W.). 



4. P. VESTITUS, Allman. 



" Notes on the Hydroidci," Ann. N. H. for July 1864. 



STEMS from half a line to two lines in height, greatly dilated 

 towards the summit, simple, or occasionally with one or 

 two short branches; POLYPARY yellowish brown, with 

 adherent particles of sand ; POLYPITES with from 6-10 

 tentacles, usually held in extension, alternately elevated 

 and depressed, a delicate continuation of the polypary 

 extending over the whole of the body beyond the tentacles 

 and almost to the margin of the mouth; GONOPHORES 

 produced, for the most part, on the stem, occasionally on 

 the stolon, borne on long peduncles, which are invested 

 for about half their length by the polypary. 



GONOZOOID. UMBRELLA (at the time of liberation) oviform, 

 much contracted towards the mouth, the walls very thin 

 and with minute thread-cells immersed in them ; MANU- 

 BRIUM with four shallow lips ; MARGINAL TENTACLES 2, 

 opposite, with non-ocellated bulbous bases, the interve- 

 ning radiating canals terminating each in a smaller bulb. 



THE only character of any importance, so far as I can 

 judge, which separates this form from the P. palliatus of 

 Wright is the shape of the umbrella at the time of libera- 

 tion. In Prof. Allmair's specimens the bell was contracted 

 towards the mouth, and was therefore oviform, instead of 

 cylindrical as in Dr. Wright's zoophyte. The other dif- 



