TUNICATA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 99 



Some of the Ascidiozooids in this colony are the best preserved I have seen in all the 

 various samples of this species that have passed through my hands, and their anatomical 

 and histological characters agree in detail with the excellent account of " Julinia " given 

 by CALMAN. In fact, I can agree with CALMAN in every respect save that of bestowing 

 a new name on the genus. It is evident from his remarks that he recognised the close 

 affinity to DistapUa, and the only mistake he made was in not referring the species to 

 that genus. 



I agree, however, with HARTMEYER* that it is practically certain that this form had a 

 distinctive generic name applied to it at a still earlier date. The " Holozoa cylindrica" 

 of LESSON (Voyage " Coquille," Zool., ii. p. 439 ; 1830) agrees in all the points that are 

 mentioned in the brief description with our form. It is said to have a " holothuriform " 

 body, cylindrica], with rounded ends, free and floating (which is apparently the con- 

 dition in which our form is usually picked up), of mucous appearance, with a whitish 

 fibrous centre composed of tubes coming from the ends of the animals ( = Ascidiozooids). 

 It was found " 30 leagues from Terre-des-Etats," at the southern extremity of America. 

 I notice that MICHAELSEN (Hamburger magalhaensiscJie Sammelreise, " Tunicaten," 

 1907, p. 40) has also suggested with a (?) that LESSON'S Holozoa cylindrica is the same 

 as "Julinia" (or DistapUa) ignota. 



Family POLYCLINID/E. 

 Polyclinum complanatum, Herdman (?). 



The species was described t from a specimen obtained at Port Jackson, Australia. 

 The Scotia material was taken at Station 483, at the entrance to Saldanha Bay, on 

 May 21, 1904, from a depth of 25 fathoms. It consists of four fragments, cut probably 

 from the same colony, the largest of which measures about 6 cm. by 2. The colony 

 was apparently flattened, and had much the same shape and colour as the Australian 

 one. The Ascidiozooids also have the same type of structure. The post-abdomen is 

 rather longer than in the Australian specimens, but that is a matter that varies with 

 the reproductive condition. The specimens are, however, so fragmentary, and there 

 is so little that is distinctive, that I cannot be certain as to the identity of the species ; 

 but there is nothing in the microscopic details to negative the view that the Falkland 

 Islands specimens belong to this Australian species. 



Amaroucium distomoides, Herdman (?). 



I refer one large colony and a few small fragments in the Scotia collection to this 

 Australian species. J The original specimen came from Port Jackson; the Scotia 



* In the new edition of the " Tunicata" of BRONX'S Tier-Reichs. 



+ See HERDMAN, Descriptive Catalogue of the Tunicata oftlx Australian Museum, Sydney, N.S. W., 1899, p. 81. On 

 the plate (Pel. I. figs. 9-12) it is referred to as "Polyclinum depretsum." 

 | See HERDMAN, ibid,, p. 75. 



(ROY. soc. KDIS. TRANS., VOL. XLVIII., 317.) 



