2s8 DISCOVERY REPORTS 



Phylum GELATINOSA 



Order CALCAREA 



Family HOMOCOELIDAE 



Genus Leucosolenia, Bowerbank 



Leucosolenia macleayi (Lendenfeld). 

 (For synonymy see Burton, 1930, p. 14.) 



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



Remarks. Two small stipitate sponges, about 1 2 mm. in height and with a stalk 7 mm. 

 long, with the typical external form. In the spicules the basal ray measures 0-09 mm. 

 and the lateral rays 0-045 mm. 



Distribution. Practically cosmopolitan. 



Leucosolenia discovereyi, Jenkin. 



L. discovereyi, Jenkin, 1908, p. 6, pi. xxviii, figs. 12, 13. 

 Occurrence. St. 53 : Falkland Islands, 0-2 m. 



Remarks. Numerous small specimens growing among Hydroids on a Mytilus shell. 

 Distribution. Victoria Land. 



Family LEUCASCIDAE 



Genus Pericharax, Polejaeff 



Pericharax pyriformis, sp.n. (Plate XLVIII, figs, i, 2). 



Holotype. B.M. 28. 2. 15. 36. 



Occurrence. St. 160: Shag Rocks, 177 m. 



Diagnosis. Sponge pyriform, with single apical oscule ; skeleton a mixture of large 

 and small triradiates in chamber layer, with a dermal skeleton of triradiates, a gastral 

 skeleton of quadriradiates and oscular skeleton of quadriradiates. 



Remarks. This is a typical Pericharax, the skeleton of which closely resembles those 

 of both P. heteroraphis and P. peziza, but which difl^ers from both in the external form. 

 The three specimens representing this species are all pyriform, with a single apical 

 oscule which leads out from a shallow cloaca bearing in its walls the openings of the main 

 exhalant canals. The surface is slightly uneven and rough to the touch. The colour, in 

 spirit, is a greyish white. The largest specimen, the holotype, measures 2 cm. high and 

 I -5 cm. across the broadest part. The diameter of the oscule is 2 mm. 



Spicules, (i) Large triradiates of the main skeleton, equiangular and equiradiate, 

 rays straight but gradually and sharply pointed, measuring up to i -2 mm. long and 

 0-096 mm. thick at the base. 



(2) Small triradiates of the main skeleton, equiangular and equiradiate, with straight 

 rays measuring up to 0-24 mm. long by 0-015 mm. thick at the base. 



