COLLECTED BY THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 429 



Station 499. St James's Bay, St Helena, 15° 57' S., 5° 40' W., 30 fathoms. 

 2nd June 1904. 



Chondrosia plebeja Schmidt. 



Station 542. Princesse Alice Bank, 37° 56' N., 29° 11' W., 350 fathoms. 

 4th July 1904. 



Aphrocallistes beatrix Gray. 



I have to thank Professor Vosmaer and Dr C. Zimmer for their valuable gifts 

 of fragments of several type-specimens, and Mr P. Kirkpatrick, of the British 

 Museum, for his kindness in allowing me every facility for studying specimens 

 under his care. I wish also to acknowledge my great indebtedness to Miss Eileen E. 

 Barnes for the care with which she made the drawings for this paper. 



CALCAREA. 



HETEROCCELA. 



Family Grantiid^e. 

 Leucandra pumila (Bowerbank). 



Station 483. Entrance to Saldanha Bay, 25 fathoms. 21st May 1904. One 

 specimen. 



The only specimen of this species in the collection is growing on a hydroid 

 colony. It is 11 mm. in height and agrees very well with Haeckel's description (8), 

 except that it possesses numerous small, bayonet-headed monaxons in the dermis, 

 a form of spicule not mentioned in the early accounts of the species. Small monaxon 

 spicules, which sometimes vary very much in numbers in different specimens of the 

 same species, were often overlooked by the early workers at the Calcarea. It seems 

 possible, therefore, that a careful examination of the type-specimen of this species 

 would result in the discovery of their presence, although I was unable to find them 

 in a section of the type in the British Museum. Or, as Dendy and Row (Proc. Zool. 

 Soc. London, 1913, p. 715) suggest, it may be that some individuals of a species 

 possess them, while others do not. Otherwise the Scotia specimen agrees exactly 

 with the type as regards the size and character of the spicules. The small, bayonet- 

 headed monaxons are 0'055-0'075 mm. in length by about 0'0025 mm. 



This species, which appears to have a wide geographical distribution, has been 

 already recorded for South Africa (8). 



Leucandra crambessa Haeckel. 



Station 24. Porto Grande, St Vincent, Cape Verde Islands, shore, N.E. 1st 

 December 1902. 



