NEW GENERA AND SPECIES. 
Si^ong. 9 
Reniera arctica, Meresc’hkowsky (14), p. 44, White Sea. 
Protoschmidtia, Ozerniavsky (5), pp. 380 & 392. Its surface is set over 
with tubes. P. simplex^ transitans, foraminosa^ grimmi — Reniera flava, 
Grimm, id. 1. c. pp. 392 & 393, mostly with “ formoB ” or “ subformss ; ” 
P. foraminosa, forma aurantiaca, figs. 6 & 7, Black or Caspian Sea. 
Schmidtia intermedia^ Ozerniavsky (5), p. 393, with 4 varr„ Black or 
Caspian Sea. 
Pellinula, Ozerniavsky (5), p. 394. P. crihrosa^ schmidti, id. 1. c. 
figs. 8-10, Black or Caspian Sea. 
Pellina flava, Mereschkowsky (14), p. 42, White Sea, var. arbuscula^ 
var. rinaldina^ var. massa, id. ibid. 
Pellina longispicula, with 3 formsB ; P. foraminoea^ Ozerniavsky (5), 
pp. 393 & 394, Black or Caspian Sea. 
Amorphina dubia^ Ozerniavsky (5), p. 392, A. protochalina, id. 1. c. 
p. 392, fig. 14, Black or Caspian Sea. 
Myxilla gigas, Mereschkowsky (14), p. 44, White Sea. 
Tedaniella, Ozerniavsky (5), p. 394, T. cylindrifera^ id. 1. c. fig. 11, 
Black or Caspian Sea. , 
Protoesperia, Ozerniavsky (5), p. 396. P. lobimana, simplex, id. 1. c. 
figs. 12 & 13, Black or Caspian Sea. 
Esperia stolonifera, Mereschkowsky (14), p. 22, pi. ii. figs. 13 & 14, 
pi. iii. figs. 4, 6, 12-19, 23-29, White Sea. Sends out a network of roots, 
perhaps connected with reproduction, from its base. 
Esperia stepanovii, muscoides, Ozerniavsky (5), p. 396, figs. 20 & 21 ; 
E. irregularis, dubia, id. 1. c., Black or Caspian Sea. 
Cliona mucronata, Sollas (19), p. 54, pi. i. figs. 1-10, 14-17, pi. ii. 
figs. 1-9. In skeleton of Isis and Melobesia. Hab. P 
Cliona ensifera, Sollas (19), p. 61, pi. i. figs. 11-13, 18, pi. ii. figs. 10-25. 
Locality as preceding. Hab. ? These two species are connected by occa- 
sional spicule-varieties. 
Cliona subulata, Sollas (19), p. 65, pi. ii. figs. 26-28. In Melobesia. 
Hab.P 
Cliona {Archceocliona) pontica, Ozerniavsky (5), p. 396, fig. 17, Black or 
Caspian Sea. 
Thecophora elongata, Marenzeller (12), p. 368, pi. ii. fig. 4, Novaia 
Zemlia. 
Clathroscula, Mereschkowsky (14), p. 43, preliminary notice of. White 
Sea. Belongs to the Suberitidince ; carries a long tube with reticulated 
walls, and aperture at summit ; two sizes of spinular spicules ; crust of 
short spicules. 
Rinalda arctica, Mereschkowsky (14), p. 4, pi. i. figs. 7-12, pi. ii. 
figs. 6-8, pi. iii. figs. 1-3, 6-10, 20-22, 30-39, North of Norway, White 
Sea. 
Pomelia, Zittel (23, infra), p. 126. Belongs to Rhizomorina group of 
LitJiistidce. Separate vertical tubes in interior ; radial canals simple ; 
summit arched; recent; also fossil in Miocene. P. schmidti, id. 1. c. pi. i. 
fig. 4, Florida. , 
Rhacodiscula, Zittel (23, infra), p. 151, pi. i. fig. 8. Belongs to the 
Tetracladina group of Lithistidm. Surface set with lobate short-stalked 
