1881.] THE SURVISY Ot H.M.S. ' ALKUT.' 101 



1876, p. 453), (Vom Tuesday Bay, Straits of Magellan. The JiflFereiice 

 between the size of the largest specimen now under examination 

 and the object of Philippi's description is considerable ; the latter 

 measured 4g lines long and 3 lines broad, whereas that from Dr. 

 Coppinger is 43 millims. long and 25*25 millinis. broad. Studer's 

 specimens afford an intermediate size, for they were 40 miUims. long 

 and 20 millims. broad. The other specimens give the following 

 measurements — 5*5 millims. and 4*25 miUims., and 4*5 and 3-25, 

 respectively, for their length and breadth. 



(1) 2 small specimens, Portland Bay, 10 fms. 



(2) 1 specimen, Latitude Cove. 



Chieodota purpurea. Lesson, Cent. Zool. p. 155; Studer, 

 Sitzungsb. Akad. Berl. 1876, p. 454. 



I refer to this species four small specimens which were collected 

 off Elizabeth Island in six fathoms of water. For the present I 

 must abstain from offering any opinion on the validity of the new 

 genus Sigmodota, which Herr Studer proposes for the receptiou of 

 this species. 



X. CCELENTERATA. 



By Stuart O. Ridley. 



(Plate VL) 



ACTINOZOA. 

 ZOANTHARIA. 



Paractis alba, Studer?. 



Paractis alba, Studer, M.B. Ak. Berlin, 1878, p. 545, pi. v. fig. 19. 



Two specimens in spirit, without any distinct coloration, except 

 a faint cream-colour on the disk and tentacles. The tentacles are 

 present, in the least contracted of the two specimens, in numerous 

 cycles, short, thick, the central ones tipped by a slight distinct 

 point ; they decrease in size towards the margin of the disk. The 

 base appears to have been broader than the disk in life ; and the 

 height of the body is about equal to the breadth of the base. The 

 sides of the body are smooth, with the exception of some more or 

 less distinct ridges which mark the position of the mesenteries. 

 Height of largest specimen 22 millims., extreme breadth of disk 1 9, 

 base 22. 



Hab. Trinidad Channel, S.W. Chili, 60 fathoms. 



The identity of this species is doubtful. The tentacles occur in 

 only two cycles in Studer's specimen ; in the longitudinal striatiou 

 of the body, however, it resembles this form. 



Paractis sp. inc. 



One spirit specimen, coloured as the preceding species. The disk 

 is much everted, and touches the base ; nearly half of its surface is 

 bare, the margin being occupied by two cycles of thick tentacles 



