PROTOZOA. 
793 
Family II. Litiiosponguts. 
Keratose network formed by siliceous fibres ; the texture decidedly stony. 
Family III. IlAPYSPONGiiE. 
Tbe spicules are siliceous and well- developed, predominating over the 
others. 
Subfamily 1. Armatcc. Spicules needle-shaped, forming a mesh with 
others which are anchor-shaped. 
Subfamily 2. Suharmatco. Only one system of acuiforni spicules. 
Subfamily 3. Tricxmiyidatm. With tricuspid spicules. 
II, OxYSPONGIiE. 
Keratose framework does not exist or is almost completely atrophied. 
Subfamily 1. Imperforanics. Numerous spicules support the soft portions 
of the sponge. 
Subfamily 2. Terforantcs. The spicules when developed only play a 
secondary part in giving a support to the soft parts. 
In the course of some observations on the motory phenomena of Sponges, 
Ifieberklilin Q. c.) demonstrated the fact that Sponges do sometimes propa- 
gate by spontaneous division. This appears to take place only in such indi- 
viduals as are nearly perishing ; but the fragments set free continue to live, 
and in the course of a few weeks develope in their interior siliceous spicules 
and vibratile cilia. 
Duchassaing & Michelotti describe the following new 
species from the Caribbean Sea : — 
Evenou (g, n.^ fnciformis (p. 20, pi. 3. figs. 1 & 2) ; SroNGiA harhnra (p. 31), 
S. corlosia (p. 31), S. cerehriformis (p. 32, pi. 3. figs. 5 & C), S. gossypina (p. 32, 
pi. 3. fig. 3), S. xitilis (p. 33), S. mcandriformis (p. 33), S. lapyidescexis (p. 34), 
S. vcrmicidata (p. 35), S. fencstrata (p. 30, pi. 3. fig. 7), S. discus (p. 37), S. 
fusca (p. 38), S. ohliqua (p. 38, pi. 4. lig. 5), S. musicalis (p. 30, pi. 0. fig. 2), 
S. marqxiezii (p. 40), S. clavahcrcuUs (p. 40, pi. 5. fig. 3), S. isidis (p. 41, pi. 7. 
fig. 2), S. hartholomei (p. 42, pi. 0. figs. 3 & 4), S. liaagmsii (p. 42, pi. 7. fig. 6), 
/S', dumetasa (p. 43, pi. 6. fig. 4), S. guadalupoisis (p. 43, pi. 7. fig.J), S. krcb~ 
hrcsii (p. 44, pi. 7. fig. 5) ; Tuua (g. n.) sancta-crucis (p. 40), T. sororia 
(p. 40, pi. 8. fig. 1), T. conica (p. 47), T. lineata (p. 47), T. mcgastoma (p.48), 
jT. incerta (p. 49), T. pavoniua (p. 50, pi. 9. fig. 1), T. crispa (p. 50, pi. 11. 
fig. 3), T.tortohxisis (p. 51, pi. 9. fig. 2), T. longissima (p. 51, pi. 9. fig. 3), T. 
suhenervia (p. 52), T. irregtdaris (p. 53), T. scigoti (p. 54) ; Callyspongia 
(g. n.) eschrichtii (p. 50, pi. 7. fig. 3), C. inflata (p. 57), C. tcncrrima (p. 57, 
pi, 10. figs. 3 & 4) ; Luff APIA (g. n.) rupicola (p. 00), L. nuciformis (p. 60, 
pi. 10. fig. 2), L. insularis (p. 61), L. picca (p. 03), L. applicata (p. 63, pi. 11. 
fig. 1) ; Lithospongia (g. n.) torva (p. 05, pi. 12. figs. 3 & 4) ; Polythebses 
(g. n.) tintinnahidum (p. 69), 1\ liuguiformis (p. 09), P. tristis, P, marginalis 
(p. 70) P. armata (p. 70, pi. 13. fig. 1), P.ignohlis (p. 71, pi. 13. figs. 3 k 4), P.- 
longispina (p. 71), P. acuta (p. 72, pi. 13. fig. 3),P. /c/7r (p. 72, pi. 13. fig. 2), 
P. capitata (p. 72), P, columnans, P. cyUndrica (p. 73) ; Hybtios (g. n.) 
proteus (p. 74, pi. 14. fig. 4), II. vilis (p. 75), II. musciformis (p. 75, pi. 14. 
fig. 3) ; Agelas (g. n.) disp>a}' (p. 70, pi. 16. fig. 1), yJ. rudis (p. 77, pL 16. 
fig. 2), A. alho-lutea (p. 77), A. dilatata (p. 77, pi. 14. fig. 1) ; Amphimedon 
(g. n.) compressa (p. 78, pi. 17. fig. 2), A. arhoresccns (p, 79, pi. 14. fig. 2) 
A, variahilis (p. 80, pi. 21. fig. 4, pi. 22. fig. 2), A.ferox (p. 81, pi. 12. fig. 6), 
