SYSTEMATIC. 
Spong. 43 
Crtr., p. 85; T. tenuis , for Spongelia rectilinea var. tenuis Hyatt, 
described; synonym T. exemplum var. prima Lend., pp. 105-108 & 
111, pi. xiv, figg. 28 & 28a: Whitelegge (64). 
(b) DENDROCERATINA. 
lanthella flabelliformis (Pallas); Whitelegge (64) p. 116. 
(iv) MYXOSPONGIDA. 
Family Halisarcida:. 
%Ralisarca sp., Antarctic, described; Topsent (60) p. 45: Topsent (56) 
p. 8. II. dujardini Johnst. var. magellanica , n. var., from Straits of 
Magellan ; Topsent (60) pp. 44 & 45, pi. i, fig. 2, pi. vi, figg. 11-14. 
Family Oscarellida. 
Oscarella lobularis (0. S.), anatomy; Kukenthal (34) pp. 43 & 44. 
E. OCTACTINELLIDA. 
(Vacant.) 
F. HETERACTINELL1DA. 
(Vacant.) 
G. INCERT,E SEDIS. 
t Ascodictyon radians Nic. & Eth. ; Peach (43) pp. 220, 244 & 246. 
t Cylindrites sp., from Cambrian ; Redlich (46) p. 8, pi. i, figg. 19 & 20, 
is a sponge according to Cossmann in review, 
f Parkeria sp.; Jukes-Browne & Scanes (30) p. 119. 
Sphenodictya , n. g., for t S. cornigera , n. sp.,from Coal-Measures, Marietta, 
Ohio; Herzer (27) pp. 30 & 31 and fig. 
