SYSTEMATIC. 
Spong. 13 
Pachastrellidce, definition : Dendy (8) p. 67. 
Paratetilla, n. g. for Tethya merguiensis Carter, and P. cineriformis, n. sp., 
Gulf of Manaar and Ceylon Seas : Dendy (8) pp. 97, 98, pi. iii, fig. 7. 
Pilochrota Sollas, defined, p. 74 ; P. haeckeli Sollas, described, pp. 74, 75, 
pi. ii, fig. 4 ; P. hornelli, n. sp. from Galle, shallow water, pp. 75-77, 
pi. ii, fig. 5 : Dendy (8). 
Plakinastrella Schulze, defined, to be removed from Plakinidce to Pach- 
astrellidce , p. 67 ; P. intermedia , n. Sp. from off Galle, 100 fathoms, 
pp. 67-69, pi. i, fig. 4, pi. ii, fig. 2 ; P. schulzei, n. sp. from off Galle, 
100 fathoms, pp. 69, 70, pi. ii, fig. 3 : Dendy (8). 
Plakinidce , definition and affinities, the genus Plakinastrella to be removed 
from it : Dendy (8) p. 65. 
Samtis simplex Carter, referred to Stoeba Sollas, q. v. : Dendy (8) p. 70. 
Sidonops Sollas, defined, p. 9 ; S. globosa , n. sp., Cape Town, pp. 9, 10, 
pi. i, fig. 4, pi. iv, figg. 1-6 : Baer (1). 
Stelletta O. S., defined, p. 77 ; S. herdmani, n. sp., Gulf of Manaar and oft’ 
Galle, up to 100 fathoms, pp. 77, 78, pi. ii, fig. 6 ; S. vestigium, n. sp. 
from off Talaivillu Paar, 10-14 fathoms, pp. 78, 79, pi. ii, fig. 7 : 
Dendy (8). 
Stellettidce , defined : Baer (1) p. 6 ; Dendy (8) p. 71. 
Stoeba Sollas, defined, to be retained distinct from Dercitus for Samus 
simplex Carter, Corticium plicatum 0. S., and S. extensa n. sp., and to 
include Calcabrina Sollas, p. 70 ; S. extensa, n. sp. from off Mutwal 
Island, 10-35 fathoms, pp. 70, 71, pi. v, fig. 1 : Dendy (8). 
Tethya. Lam., genus defined, p. 4 ; T. armata , n. sp., Zanzibar, pp. 4, 5, 
pi. i, fig. 1, pi. iii, figg. 1-5 : Baer (1). 
Tethyopsilla Lend., defined, p. 5 ; T. globosa , n. sp., Zanzibar, pp. 5, 6, 
pi. i, fig. 2, pi. iii, figg. 6-10 : Baer (1). 
Tethyopsillidce, defined : Baer (1) p. 5. 
Tetilla O. S., defined, p. 89 ; T. anomala, n. sp., Coast of Ceylon, 10- 
36 fathoms, pp. 91-93, pi. iii, fig. 5 ; T. hirsuta Dendy, described, 
pp. 89, 90 ; T. limicola, n. sp., Tamblegam Lake, Trincomalee, 
pp. 93-95, pi. i, fig. 7, pi. iii, fig. 6 ; T. poculifera, n. sp. from Gulf of 
Manaar and W. Coast of Ceylon, deep water, pp. 90, 91, pi. i, fig. 6, 
pi. iii, fig. 4 : Dendy (8). 
Tetillidce, defined : Dendy (8) p. 89. 
(2) LITHISTIDA. 
Lithistida, definition and characters : Dendy (8) p. 99. 
Acicidites 0. S., defined, should be referred to the Azoricidce, p. 101 ; A. 
orientalis, n. sp., Ceylon seas, pp. 101, 102, pi. iv, fig. 3: Dendy (8). 
Discodermia Bocage, defined, p. 99; D. emarginata , n. sp. from 12 miles 
off Galle, 100 fathoms, pp. 99-101, pi. iv, fig. 4 : Dendy (8). 
+ Eospongia varians, described : Seely (33) pp. 153, 154. 
t Hindia indianensis, n. sp., Hamiton group, Indiana ; Whitfield (45), 
p. 299, pi. x, figg. 1-6, Bull. Amer. Mus. xxi. 
Petromica Topsent, defined, p. 104 ; P. massalis, n. sp., Gulf of Manaar 
and W. coast of Ceylon, pp. 104, 105, pi. iv, fig. 5 : Dendy (8). 
Taprobane, n. g., might be referred to either Azoricidce or Scleritoder- 
midce, and necessitates a revision of Sollas’s classification of Lithistida, 
p. 102: for T. herdmani, n. sp., Gulf of Manaar, 9 fathoms, pp. 103, 
104, pi. i, fig. 8, pi. iv, fig. 2 : Dendy (8). 
(ii) MON AXON ID A. 
Monaxonellida, defined and subdivided into Astromonaxonellida and Sig- 
matomonaxonellida : Dendy (8) pp. 105, 106. 
