SYSTEMATIC. 
Spong. 23 
Luhomyrskia irregularis : Iakhontoff (23) p. 3. 
Metschnikowia spinispiculum (Carter) T., redescribed, p. 243; M.filholiT.^ 
redescribed, pp. 243, 244: Topsent (50). — M. tuherculata^ M. inter- 
media : SowiNSKY (46) p. 173. 
Oceanapia N., remarks on genus, pp. 127, 128 ; 0. hacillifera, n. sp., 
diagnosed and described, pp. 128-130: Wilson (60). — 0. robusta 
(Bowerbank) N., redescribed: Topsent (50) pp. 228, 229. 
Pachychalina acapulcensis, n. sp., diagnosed and described : Wilson (60) 
pp. 124-127. 
Pellina semitiLbulosa, P. longispicula^ P. foraminosa: Sowinsky (46) 
p. 289. 
Petrosia crassa (Carter) L., redescribed: Topsent (50) pp. 240, 241. — 
P. variabilis crassa, n. STibsp., diagnosed and described, pp. 118-121; 
similis densissima, n. subsp., diagnosed and described, pp. 121-124: 
Wilson (60). 
Phl(x,odictyon fistidosum B., redescribed, pp. 235, 236 ; P. coriaceum, n. sp., 
described, p. 237; P. elongatum (Topsent) L., redescribed, p. 238; 
P. reticidatum, n. sp., described, pp. 238, 239; P. cereuvi, n. sp., 
described, pp. 239, 240 : Topsent (50). 
iPhylosiphonia pumila L., redescribed: Thum (49) pp. 17, 18. 
Protoschmidtia qrimmi, P. simplex, P. tra7isita7is, P. foraminosa : Sowinsky 
(46) pp. 173, 328. 
Renieridce, nutrition in : Cotte (6). 
Reniera implexa Sch., redescribed, p. 244 ; R. foraminosa, n. sp., 
described, p. 245; R. spongiosa, n. sp., described, p. 245; R. utriculus, 
n. sp., described, p. 246 ; R., sp., described, p. 246 : Topsent (50). — 
R. simidans, nutrition in : Cotte (6). — R. flava, R. alba, R. aquce- 
ductus, R. informis, R. inflata, R. pahnata, R. nigricans : Sowinsky 
(46) pp. 173," 289. 
Rhaphisia spissa T., redescribed : Topsent (50) pp. 233-235. 
Schmidtia intermedia : Sowinsky (46) p. 289. 
iSpinosella sororia, var. dilatata D., redescribed, pp. 18, 19; S. sororia, 
var. elongata D., redescribed, pp. 19, 20: Thdm (49). 
Spongillides from Roumania : Chirica (2). 
Spongilla lacustris, external characters described : Gillot (13). — S. fluvia- 
tilis, spermatogenesis in : Gorich (14). — S. microgemmata : Iakhon- 
toff (23) p. 3. —S. lacustris : Range (39) p. 238. 
Veluspa baicalensis, V. fusifera : Iakhontoff (23) p. 3. 
Family Axinellid^e. 
Description of family : Topsent (50) p. 137. 
iAcanthoraphis intertextus : Jukes-Browne & Hill (26) p. 505. 
Axinella vasonuda, n. sp., described, pp. 140, 141 ; A. vellerea, n. sp., 
described, 141, 142; A. flustra T., redescribed, pp. 139, 140: Topsent 
(50). — A. rugosa: Schepotieff (42), p. 3. 
Auletta sycinularia Sch., resdescribed, pp. 143, 144; A. sessilis, n. sp., 
described, p. 144, 145: Topsent (50). — A. dendrophora, n. sp., 
diagnosed and described: Wilson (60) pp. 158-161. 
Halicnemia constellata T., redescribed, azorica var. n. : Topsent (50) 
p. 149. 
Higginsia thielei T., redescribed : Topsent (50) p. 150, 151. 
Hymeniacidon sanguineum, bionomics : Cuenot (7). — H. sanguineum, 
Mar. Biol. Ass. (34). 
Phakellia robusta B., redescribed, p. 143 ; P. lamelligera, n. sp., diagnosed 
and described, pp. 155-158: Wilson (50). — P. ventilabrum : Schepo- 
tieff (42) p. 3. 
