SYSTEMATIC. 
Spong. 25 
Joyeuxia T., diagnosis of genus, p. 205 ; J. viridis T., redescribed, p. 206 ; 
J. tubulosa, n. sp., described, pp. 206, 207 : Topsent (50). 
Leptolabis, n. g., definition of genus, pp. 181, 182; L. forcipida^ n. sp., 
described, p. 182; L. forcipula, n. var. hrunnea, described, p. 183; 
L. arcuata^ n. sp., described, pp. 183, 184; L. luciensis T., redescribed, 
pp. 184, 185: Topsent (50).— X. luciensis: Mar. Biol. Ass. (34). 
Leptosia T., definition of genus, p. 185; L. occulta (Bowerbank) T., re- 
described, pp. 186, 187; L. pecqueryi T., redescribed, pp. 187, 188; 
L. i^ceA^eW T., redescribed, p. 189; L. schmidti T., redescribed, pp. 190, 
191 ; L. haculifera T., redescribed, p, 191 ; L. hiscutella, n. sp., de- 
scribed, pp. 191, 192; L. umbellifera, n. sp., described, p. 192; L. 
rhaphigena^ n. sp., described, pp. 192, 193; L. ohtusata, n. sp., de- 
scribed, p. 193 ; L.acerata^Ti. sp., described, pp. 193, 194 : Topsent (50). 
Leptosastra, n. g., definition of genus, p. 194 ; L. constellata^ n. sp., de- 
scribed, pp. 194, 195 : Topsent (50). 
Lissodendoryx simplex, n. sp., described, p. 173; L. fertilior, n. sp., de- 
scribed, pp. 173, 174: Topsent (50). 
Melonanchora elliptica C, redescribed: Topsent (50) p. 177. 
Microciona atrasanguineum, bionomics: Cuenot (7). 
Myxilla paupertas (Bowerbank) V., redescribed with list of synonyms, 
pp. 168, 169 ; M. mariana R. & D., n. var. polysigma, described, 
pp. 169, 170: Topsent (50). 
Phlyctcenopora, n. g., definition of genus, pp. 198, 199; P. bitorquis, 
n. sp., described, pp. 199, 200: Topsent (50). 
Plocamia anibigua (Bowerbank) T., list of synonyms and descriptions, 
pp. 154, 155 ; P. coriacea (Bowerbank), var. elegans R. & D., re- 
described, p. 155 : Topsent (50). 
Plocamiopsis, n. g., definition of genus, p. 155 ; P. signata, n. sp., described, 
pp. 155-157 : Topsent (50). 
Protoesperia simplex, P. lobimana : Sowinsky (46) p. 328. 
Rhahderemia T., description of genus and species, pp. 151, 152 ; R. 
minutula (Carter) T., redescribed, pp. 152, 153 : Topsent (50). 
Rhabdoploca, n. g., definition of genus, pp. 157, 158 ; R. curvispiculifera 
(Carter), redescribed, pp. 158, 159 : Topsent (50). 
Rhaphidotheca S. K., definition of genus, p. 202 ; R. loricata T., re- 
described, pp. 202, 203 : Topsent (50). 
Stelodoryx, n. g., definition of genus, p. 174 ; S. procera, n. sp., described, 
pp. 174-176 : Topsent (50). 
Stylostic/ion repens, n. sp., described : Topsent (50) p. 170. 
Stylotella jidlieni T., redescribed : Topsent (50) p. 225. 
Suberotelites demonstraiis T., redescribed : Topsent (50) p. 157. 
Tedania suctoria Sch., redescribed, p. 176 ; T. commixta R. & D., re- 
described, pp. 176, 177 : Topsent (50). 
Trachyforcepia, n. g., definition of genus, p. 181 ; T. grcenlandica (F.), 
redescribed, p. 181 : Topsent (50). 
Tylodesma T., remarks on genus, pp. 135, 136 ; T. alba, n. sp., diagnosed 
and described, pp. 136-138 ; T. vestibularis, n. sp., diagnosed and 
described, pp. 139-142 : Wilson (50). 
Yvesia pertusa T., redescribed, p. 196 ; Y. alecto T., redescribed, 
pp. 196-198 ; Y. carnosa, n. sp., described, p. 198 : Topsent (50). 
(iii) KERATOSA. 
(a) DICTYOCERATINA. 
Family Spongid^. 
Aplysinopsis massa, n. sp., described ; A. tuberosa, n. sp., described : 
SZYMANSKI (47). 
