317 



XX. PORIFERA. 



By K. KIKKPATKICK. 



The three specimens of Antarctic Sponges which were obtained 

 represent the following three species : — 



' LeucosoJenia variabilis, Haeckel. 

 EaUchondria panicea, Johnston. 

 Halichondria sp. 



LEUCOSOLENIA VARIABILIS. 



1^72. Ascetta variabilis, Haeckel. Kalksclivvamme II., p. 106. 



1896. Leucosolenia variabilis, Mincliin, Ann. Mag. Nat. Hist. (6), XVIII., 

 p. 350. 



The specimen consists of a single tube about .3 mm. in length 

 and • 5 mm. in breadth, growing in a crevice formed by the coils of 

 Sjnrorhis antarctica. 



The Antarctic specimen shows slight variations from the Medi- 

 terranean form, the larger monaxons, with double-edged lance-shaped 

 terminations, being thicker, and the smaller monaxons much less 

 abundant in the former. With respect to the arrangement and 

 general characters of the tri- radiates and quadri- radiates the 

 Antarctic specimen exhibits no noteworthy variation. 



Locality. — Cape Adare, 18 fathoms (dredged). Sea temperature 

 29° Fahr. 



Distribution. — Arctic Ocean (Barent's Sea) ; Norway ; Great 

 Britain and Ireland ; Mediterranean ; Cape Town ; Cape Adare. 



HALICHONDRIA PANICEA. 



1842. Halichondria panicea, Jolinston, '?>iit. Sponges,' p. 114, Pis. X. and XI., 



fig. 5. 



The specimen consists of a friable amorphous fragment of pale 

 yellow colour. The skeleton, as in the case of specimens from 



