SYSTEMATIC. 
Spong. 21 
Family THENElDi:. 
Thenea , see Ancorina. T. muricata ; Lo Bianco (30) pp. 243, 245, 246, 
270. 
Family Pachastrellid^e. 
Pachastrellidce , definition of the family, to include the genera Pachastrella , 
Pachastrissa, Dercitus , and Calthropella ; Lendenfeld (27) pp. 71 & 72. 
Caltkropella Soil., genus defined, with diagnoses of 2 spp. ; Lendenfeld 
( 27) p. 83. 
Pachastrella 0. S., genus defined, with sub-genera Triptolemus , Pachas- 
trella and Nethea , and diagnoses of 22 spp. ; Lendenfeld (27) pp. 72- 
80. \P. antiqua, spicules of, in chert ; Raisin (41) p. 80. 
Pachastrissa n. g., for Stelletta pathologica O. S., Pachastrella geodioides 
Crtr., and P. connectens 0. S. ; Lendenfeld (27) pp. 80 & 81. 
Triptolemus incertus n. sp. from the canals of Discodermia natalensis , 
Natal Coast; Kirkpatrick (25) p. 178, pi. iv, figg. 4, 4a-/. 
Family Stelletti dte. 
Stellettidee , definition of the family, to include the genera Stelletta, 
Ancorina , Tribrachion , Disyringa , Tethyopsis, Papyrula , and Sphinc- 
trella ; Lendenfeld (27) p. 33. 
Ancorina 0. S., genus defined, with sub-genera Ancorina , Stryphnus , 
Thenea, Sanidastrella , Penares , and Ecionemia , and diagnoses of 
34 spp., pp. 49-67 ; A ( Ecionemia ) amboinensis nom. nov. for Stelletta 
truncata Kieschnick, p. 63 ; ^4. ( Sanidastrella :) atlantica nom. nov. 
for Stelletta pachastrelloides 0. S., p. 59; A. ( Thenea ) grayii thielii 
nom. nov. for Thenea compacta Thiele, p. 57 : Lendenfeld (27). 
Disyringa Soli., genus defined, with diagnoses of 1 sp. ; Lendenfeld (27) 
p. 68. 
Ecionemia , see Ancorina. 
Papyrula O. S., genus defined, with diagnoses of 2 spp. ; Lendenfeld (27) 
pp. 69 & 70. 
Penares , see Ancorina. 
Sdnidastrella, see Ancorina. 
Sphinctrella 0. S., genus defined, with diagnoses of 4 spp. ; Lendenfeld 
( 27) pp. 70 & 71. 
Stelletta O. S., genus defined, with diagnoses of 52 spp. ; Lendenfeld (27) 
pp. 33-49. S. grubei 0. S. ; Rousseau (43) p. 13. t S. inclusa Hinde ; 
Jukes-Browne & Hill (24) p. 370-379. S. renilla nom. nov. for 
S. reniformis Kieschnick ; LendeNEeld (27) p. 44. 
Stryphnus , see Ancorina. 
Tethyopsis Stew., genus defined, with diagnoses of 2 spp. ; Lendenfeld (27) 
pp. 68 & 69. 
Tribrachion Weltn., genus defined, with diagnoses of 1 sp. ; Lendenfeld 
( 27) p. 67. 
Family Geodid^:. 
Geodiidee, family defined, includes genera Erylus , Gaminella , Pachyma- 
tisma Caminus, Geodia , Isops , Svdonops , and Geodinella ; Lendenfeld 
( 27) p. 84. 
Caminella Ldf., genus defined, with diagnoses of 2 spp. ; Lendenfeld (27) 
pp. 89 & 90. 
1903. [VOL. XL.] F 8 
