NORTHUMBERLAND AND DURHAM. 155 



Encrusting, semitransparent, yellowish white; general 

 envelope inconspicuous ; polypides prominent, ventricose, 

 flask-shaped, sub-recumbent, becoming erect towards the 

 a23erture, which is truncated when contracted ; tentacles, 

 18. 

 Surrounding the stem. of Plumularia falcata in small patches; 

 from the deep-water fishing boats; rare. — J. A. 

 This species looks somewhat like a cluster of separate animals, 

 the polypides being prominent and united to each other by 

 narrow septa. When the polypide is extended it is columnar, 

 tapering a little upwards, and expanding into a slight ridge 

 below the fasciculated sheath of seta3. It may be doubted 

 whether the specimens examined were in an adult state. 



6. A. HEXAGONUM, HincTcs. 



Alcyonidium mytili^ Daly. Rare and Rem.Anim. Scot., 



V. 2, p. 36, t. xi. ? 

 Alcyonidiimi hexagonwn^ Hincks, in Journ. Micros. 

 Sc, No. 19. 

 On stones and shells from between tide-marks to deep 

 water; frequent. 

 It is possible that more than one species may be here included 

 under the above name. The Alcyonidia of our coast have 

 been very imperfectly investigated. All that can be said at 

 present is that one species at least, resembling in its character 

 the A. hexagonum of Hincks and A. my till of Daly ell, is not 

 uncommonly met with on stones within tide-marks, as well as 

 on shells and other substances from deep water. It has not yet 

 been observed upon sea-weeds. 



7. A. POLYOUM, Hassall? 



Sarcochitum pohjown, Johns. Brit. Zooph., 365, t. 



Ixxi. ? 



On the underside of stones in tide-pools, with the last; 



frequent. 



This species is frequently found on the same stone with the 



last, from which it differs in being thicker and of more gelatinous 



