NEW GENERA AND SPECIES. 
Spong. 18 
lanternaf id. ibid. pi. iii. fig. 17, pi. v. fig. 6, Morro Light and another 
doubtful locality, 292-320 fath., has lantern-like nodes; 8. comcww, id. 1. c. 
p. 57, pi. viii. fig. 4, Morro Light, 292 fath. ; S. seriatum, id. ibid. pi. viii. 
fig. 5, Morro Castle, 200-300 fath. ; S. herculeum, id. ibid. Santa Cruz, 
580 fath. 
Diplacodiiim, Schmidt, (9) p. 57. Based on D. mixtum, id. ibid. pi. iii* 
fig. 16, pi. iv. fig. 7, Morro Light and Gulf of Mexico, off Cuba, 101-292 
fath. Consists of bilaminar plates, has lantern-nodes, delicate sex-radiate 
spicules and two kinds of rosettes. 
Volvulina, Schmidt, (9) p. 58. Based on V. sigsbeei, id. ibid. pi. iii. 
figs. 14 & 15, pi. iv. fig. 6, pi. vi. fig. 6, Caribbean Sea and Gulf of Mexico, 
100-292 fath. 
Pacli\jj'\aulidium, Schmidt, (9) p. 59. Tubular, tube angular in out- 
line ; meshes polyhedric ; nodes approximated. No specific name given. 
Locality, Santa Cruz, 580 fath. 
Regadrella, Schmidt, (9) p. 61. Based on R. phoenix^ id. ibid. pi. viii., 
Caribbean Sea, 221-248 fath. Euplectellid in affinities, with a firm 
instead of a fibrous rooting basis. 
Hertwigia, Schmidt, (9) p. 62. Based on II. falcifera, id. ibid. pi. vi. 
figs. 8 & 9, pi. viii. fig. 8, Dominica, 611 fath. Between Dictyonina and 
Lyssacina. Form irregular, with labyrinth ic cavities ; six varieties of free 
spicules, including the Enplectella-vosette and a rosette with long hooked 
rays. 
Rhabdoplectella, Schmidt, (9) p. 62. Based on R. tintinnus, id. ibid. 
pi. vi. fig. 10, pi. viii. figs. 9 & 10 ; Grenada and South of Cuba, 291 & 994 
fath. Form various ; the skeleton sex-radiates have strongly developed 
main axis ; six varieties of flesh spicules. 
Rhabdostauridium, Schmidt, (9) p. 59. Based on R. relortula^ id. ibid. 
pi. vii. fig. 8, Gulf of Mexico, 804 fath. Retort-shaped, intermediate 
between Dictyonina and Lyssacina. Formed of long fibres united by 
siliceous matter, no free spicules observed. 
Euplectella jovis, Schmidt, (9) p. 60, pi. vi. fig. 7, Caribbean Sea, 416- 
423 fath. 
Asconema henti, Schmidt, (9) p. 65, pi. v. fig. 10, Caribbean Sea, 338- 
1507 fath. May possibly bo referable to a new genus. 
Diaretula, Schmidt, (9) p. 45. Dictyonina with meshes of cubical 
character, but more irregular than those of Farrea. The wall grows by 
increase in thickness, not extent ; no free spicules. D. cornu, id. ibid. 
pi. iv. fig. 3, pb iii. fig. 9, murella, id. 1. c. p. 46, Gulf of Mexico, 805 
fath. 
Cyathella, Schmidt, (9) p. 46. Based on C. lutcayX^.ibid. pi. vii. fig. 2. 
Shaped like a champagne-glass ; skeleton irregular, inclining to the cubical 
type, Caribbean Sea, 1591 fath. 
Rhabdodictyon \_-um], Schmidt, (9) p. 46. Based on R. delicatum, id. 
ibid. pi. vi. fig. 1, pi. vii. fig. 3. Tube- or cup-shaped ; skeleton a mixture 
of Dictyonine and Lyssacine tissue ; a fine rcsette spicule. Caribbean 
Sea, 1591 fath. 
Syringidium, Schmidt, (9) p. 46. Based on S. zitteli, id. ibid. pi. iv. 
figs. 9 & 10, pi. vii. fig. 4. [The author states that it is most probably 
