CALCAREA 259 



(3) Triradiates of the dermal skeleton slightly irregular and arranged tangentially to 

 the surface, each ray about 0-24 mm. long. 



(4) Quadriradiates of the oscular margin sagittal with facial rays 0-105 mm. long and 

 apical rays 0-12 mm. long. 



(5) Quadriradiates of the gastral cortex and larger exhalant canals, of similar dimen- 

 sions to (4) but not sagittal. 



Genus Leucetta, Haeckel 

 Leucetta leptoraphis (Jenkin). 



Leiicandra primigenia, var. leptoraphis, Jenkin, 1908, p. 14, pi. xxix, figs. 33, 34; Leucetta 

 antarctica, Dendy, 1918, p. 8, pi. i, figs. 2-7; L. leptoraphis. Burton, 1929, p. 404, pi. v, figs. 1-4. 



Occurrence. St. 39: South Georgia, 179-23501.; St. 42: South Georgia, 120-20401.; (St. 84: 

 32° S, 1° E, 75-74 m. ; there is evidently a doubt about this station which should probably be Palmer 

 Archipelago, St. 190); St. 140: South Georgia, 122-136 m.; St. 148: South Georgia, 132-148 m.; 

 St. WS 84: Falkland Islands, 75-74 m. 



Remarks. Some ten specimens are present agreeing with the holotype in spiculation 

 and showing the same range in external form as that to which I have drawn attention 

 in my Terra Nova report (loc. at.). 



Distribution. Victoria Land. 



Leucetta macquariensis, Dendy. 



L. macquariensis, Dendy, 1918, p. 9, pi. i, figs. 3, 8. 



Occurrence. St. 53 : Falkland Islands, 0-2 m. ; St. 55 : Falkland Islands, 10-16 m. ; St. 56 : Falkland 

 Islands, 10I-16 m.; St. 145 : South Georgia, 26-35 m.; St. 156: South Georgia, 200-236 m. 



Remarks. There are considerable differences between the individuals of this species 

 as regards the large oxea and the microxea. One or other of these types of spicules may 

 be sparingly present or even entirely absent, and but for the fact that they are never both 

 absent altogether, the task of identification would present some difficulty. Even so, it 

 is easy to imagine that single specimens examined alone might conceivably be placed 

 in a different species, owing to the absence of one or other of these spicules, and it is 

 quite possible that the case may yet arise in which an individual will be found to have 

 lost both sets of spicules entirely. 

 Distribution. Macquarie Island. 



Family LEUCALTIDAE 

 Genus Leucaltis, Haeckel 

 Leucaltis gastrorhabdifera, sp.n. (Figs. 4, 5). 

 Holotype. B.M. 28. 2. 15. 833. 

 Occurrence. St. 6: Tristan da Cunha, 80-140 m. 



Diagnosis. Sponge erect, tubular, without oscular fringe ; surface very minutely and 

 sparingly hispid; skeleton composed of a dermal layer of triradiates, with large sagittal 



