200 TKANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



Hymeniacidon pertenue, B., 4, XIII. 



plumigerum, B., LXXII. 

 radio sum, B., LXXII. 

 sanguineum, Grant, XXXII. 

 simplex, B., XLVIL 

 virgulatum, B., 4, IV. 

 viridans, B., XXXIII. 



Genus Phakellia, Bowerbank. 

 Sponge fan — or funnel — shaped. Skeleton somewhat 

 reticulate. Megascleres styli and often oxea, generally 

 slender and twisted. No microscleres. 



Note. 0. Schmidt, and Ridley and Dendy regard Ph. 

 robusta as identical with, or, at the most, only as a 

 variety of Ph. ventilabrum. I prefer to keep the two 

 forms separate. 

 Phakellia robusta, B., XXI. 



,, ventilabrum, Johnston, XXII. (Bidley and 

 Dendy, 14, p. 170.) 



Genus Tragosia, Gray. 

 Sponge fan — or funnel — shaped, or branching and 

 anastomosing. Skeleton pretty regularly reticulate. 

 Megascleres styli and often oxea, not twisted and stouter 

 than in Phakellia. No microscleres. 

 Tragosia barleei, B., LVII. 



,, infundibuliformis, Johnst., XIV and LIV. 



(Carter, 1, p. 240.) 

 ,, polypoides, O. Schmidt, LV. 

 Genus Giocalypta, Bowerbank. 

 Sponge massive or ramose. Megascleres stylote and 

 sometimes oxeote. From a central skeleton are given off 

 pillars of spiculo-fibre at about right angles, spreading out 

 and supporting the dermal membrane, leaving large sub- 

 dermal spaces. No microscleres. 



