to our Knowledge of the Spongida. 303 
show that it is composed of a granular mucus charged with 
cells, a, cells, magnified, to show their prevailing shape. 
Plate XXVI. 
Fig. 1. Axos Jlabelliformis, n. sp. (3-oths of the natural size). From n 
photograph. 
Fig. 2. The same. Skeleton-spicule (scale l-24th to 1-6000th inch). 
Fig. 3. The same. Flesh-spicule (same scale). 
Fig. 4. The same. Length of skeleton-spicule on scale of l-24th to 
1-1800th inch, for comparison with fig. 7 of same Plate and 
fig. 2, PI. XXV. 
Fig. 5. Axos Clftoni, Gray. Skeleton-spicule (scale l-12th to 1-1800th 
inch). 
Fig. 6. The same. Flesh-spicules, a, common form; b, less common 
form; c, P embryonal form (scale l-24th to 1-6000th inch). 
Fig. 7. The same. Length of skeleton-spicule on the scale of l-24th to 
l-1800th inch, for comparison. 
Fig. 8. Portion of coral detritus bearing Chondrilla sacciformis (9) and 
Fhaphidhistia spectcibilis (10), nat. size. 
Figs. 9, 9, 9. Chondrilla sacciformis , n.sp. (nat. size), a «, saccular forms: 
b, adnate form ; c, vents, papillary. 
Figs. 10, 10. Fhaphidhistia spectabilis, n. sp. (nat. size). 
Fig. 11. Chondrilla sacciformis. Skeleton-spicule (scale l-24th to l-1800th 
inch). 
Fig. 12. The same. Flesh-spicule (same scale), a, portion of the gra¬ 
nular mulberry-like surface, more magnified, to show the ar¬ 
rangement and form of the “ granules in situ ; b, lateral view 
of a single granule, showing spinous truncate extremity ; c, the 
same, simple conical form. 
Fig. 13. Fhaphidhistia spectabilis. Skeleton-spicule (scale l-24th to 
l-1800th inch). 
Fig. 14. The same. Flesh-spicule (same scale), a, the same, much 
more magnified, to show the sinuous (spiral) form of the shaft 
and spiral arrangement of the spines. 
Fig. 15. Hgmeraphia spiniglobata, n. sp. Skeleton-spicule (scale l-12th 
to l-1800tli inch ). 
Fig. 16. The same. Flesh-spicule, a, spheroidal or globular form, same 
scale ; b, spiro-globular form; c, d, the same, more magnified, 
to show the spines and figures respectively. 
Plate XXVII. 
Fig. 1. Latruncula corticata, n.sp. Natural size of specimen. «, chon- 
droid layer or cortex ; b, internal structure. 
Fig. 2. The same. Surface of cortex, much magnified, to show: — 
a, pores ; and b, points of skeleton-spicules, relatively situated. 
Fig. 3. The same. Skeleton-spicule (scale l-12th to l-1800th inch). 
Fig. 4. The same. Flesh-spicule (scale the same), a, b, c, the same, 
more magnified, to show the transitionary forms present, viz.: — 
a, sceptrella; b, intermediate form between the sceptrella and 
(c) the spinispirular form. 
Fig. 5. Dictyocglindrus Viclcersii, Bk. Fragment. Natural size. 
Fig. 6. The same. Spiculation relatively magnified (scale l-24th to 
l-1800th inch), a, long setaceous acuate; b, thick short 
acuate; c, undulating acuate; d, echinating quadriradiate spi¬ 
cule ; e, quinqueradiate form ; /, smooth-armed triradiate form ; 
g, the same, quadriradiate. 
