1881. J THE SURVEY OF H. M.S. 'aLICRT.' lOii 



its specific distinctness. It differs from the rest of the genus in the 

 number of its septa. 



Alcyonaria. 

 Primnoella AUSTRALASIA, Gray. 

 Primnoa australasice. Gray, P. Z. S. 1849, p. 146, Radiata, pi. ii. 



figs. 8. 9. 



Primnoella australasice, Gray, P. Z. S, 1857, p. 286. 



A single specimen, about 54 centims. long ; in spirit. It agrees well 

 with the numerous specimens already in the Museum. Close to the 

 present base (which, however, is not the original base, as it has been 

 snapped off from a longer specimen) an empty shark's egg is attached ; 

 its two fastenings having, apparently, modified the growth of the 

 cortex at their point of attachment. 



Hab. Trinidad Channel, S.W. Chili, 30 fathoms, sandy bottom. 



Hydrozoa. 

 Hydroidea. 



Lafoea dumosa, Fleming. 



Sertularia dumosa ?, Montagu ap. Fleming, Edin. Phil. Journ. ii. 

 p. 83. 



Lafoea dumosa, Hiucks, Brit. Hvdr. Zooph. i. p. 200, ii. ph xli. 

 fig. 1. 



Abundant in the creeping form. The caliele is simple, or else 

 possesses from 1 to 4 rings (old mouths) at different heights. 



Hab. Trinidad Channel, S.W. Chili, 30 fathoms, on Sertularella. 



Eudendrium arbusculum, d'Orbigny ? (non T. S. Wright). 



Tubu/aria arbuscula, d'Orbigny, Voy. Ame'r. merid. p. 28, pi. xiii. 

 figs. 11, 12. 



The lower part of the stem is made up of contorted tubes, and the 

 colony resembles E. rameum closely in external appearance ; and is 

 apparently nearly related to it. D'Orbigny makes the stem of about 

 oiie diameter throughout, but as in the magnified drawing he depicts 

 part of it as thicker than the part below it, which is contrary 

 to analogy, it does not follow that his other figure is correct ; 

 according to that, the origin of the branchlets is dorsal or ventral, 

 not lateral, and they take a twist to the side on leaving it. The 

 stem in the present example is always ringed between the branches, 

 though to a varying extent, and the branchlets are annulated for 

 most' of their "length. Characters of polypites and gonophores 

 unknown. Maximum height about 80 millims. Several colonies 

 occur together. 



Hab. Trinidad Channel, S.W. Chili, 30 fathoms, from stem of 

 seaweed ? 



IIalecium delicatulum, Coughtrey. 



Halecium delicatulum, Coughtrey, Ann. & Mag. Nat. Hist. ser. 4, 

 xvii. p. 26, pi. iii. figs. 4 & 5. 



Several colonies, of 27 millims. height, appear to represent the above 



