14 Spong. 
XVII. spongia:. 
(iv) Paleozoic. 
(a) General : — Type specimens of Pakeozoic sponges in the New York 
State Museum; Clarke & Ruedemann (8) pp. 11-34. 
(b) , (c), (d) Vacant. 
(e) Lower Carboniferous : — Carboniferous of Colorado, Hyalostelia 
and Hystriospongia ; Girty (18). 
(f) Devonian: — Devonian of New Jersey, Hindia fibrosa ; Weller 
(54) p. 297. Devonian of Western Tennessee, Astrceosponqia ; Foerste (17) 
pp. 692, 694. 
(g) Silurian: — Silurian of Western Tennessee, list of sponges; 
Foerste (17). 
(h) Ordovician : — Cincinnati group in Western Tennessee, Hindia 
sp. ; Foerste (16) p. 35. — Trenton of New Jersey, Hindia and Recepta- 
culites ; Weller (54) p. 135. 
IV. SYSTEMATIC. 
[A name of a species, followed only by a reference to a name from the list 
of titles, is a record of occurrence pure and simple. The locality (or 
horizon) can be found by looking up the reference letters of section hi, 
following the title in the list above (section i).] 
A. PORIFERA, GENERAL. 
B. CALCAREA. 
(i) HOMOCGELA. 
Family Clathrinidas. 
Clathrina ( Ascetta ) coriacea H., physiology; Cotte (9): G. ( Leucosolenia ) 
contorta (Bwk.) and G. (Leucosolenia) lacunosa Johnst. ; Rousseau (43) 
p. 7. C. (Ascetta) primordialis H. ; Preiwisch (39) p. 10. 
Family Leucosolenjidje. 
Leucosolenia botryoides (Ell. & Sol.), described, p. 5, fig. 1 ; Z. complicata 
(Mont.), described, p. 7, fig. 3; L. fabricii 0. S., described, p. 6, fig. 2; 
L. variabilis (H.), described, p. 8, fig. 4: Rousseau (43). 
(ii) HETEROGCELA . 
Family Sycettidas. 
Sycon seu Sycandra, S. ciliatum (Fabr.), described ; Rousseau (43) p. 9, 
fig. 5: physiology; Cotte (9): S. coronatum (Ell. & Sol.), described; 
Rousseau (43) p. 10, fig. 6: Preiwisch (39) p. 10: S. elegans, physio- 
logy ; Cotte (9) : S. parvula n. sp. from Laysan Is. ; Preiwisch (39) 
pp. 15-17, pi. iv, figg. 9-12: & raphanus H., physiology; Cotte (9): 
degenerative changes in; Cotte (10): spermatogenesis; Gorich(19): 
JS. staurifera n. sp. from Laysan Is. ; Preiwisch (39) pp. 17-19, pi. iii, 
fig. 8. 
