16 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
‘spines. The slight curve of the spines may be due to mechanical pro- 
cesses, Size: 0.1076 mm. by 0.092 mm. ; length of spine, 0.035 mm. 
Nothing similar to this has been found described or figured. I propose 
the name Geodia? cretacea. 
Figure 11. Geodia? Austini, n. sp. Imperfect. Breakage caused 
perhaps by mechanical movement or abrasion. Body spherical and 
smooth between the spines. Spines short, divided into minute barbs. 
Some of them have a double system of bifurcation. Size: 0.069 mm. 
from tip to tip; length of spine, 0.0153 mm. Not found figured. I 
propose the name Geodia ? Austint. 
Figure 14. Geodia? irregularis, n. sp. Spicule perfect. Body glob- 
ular and smooth between the long spines. Spines are easily seen to be 
hollow tubes, variously terminated, but principally by short lateral pro- 
jections near the end. Size: 0.1003 mm. by 0.088 mm.; length of 
spine, 0.0269 mm. Only one of this variety was found in the slides 
examined. І propose the name Geodia? irregularis. 
Figure 15. Geodia? tripunctata, n. sp. Outline perfect. Body 
pear-shaped, smooth and hollow. Spines irregularly placed on body, 
slightly tapering and terminating in three slender barbs. Size: 
0.073 mm. by 0.061 mm.; length of spine, 0.0236 mm. This was not 
found figured. I propose the name Geodia? tripunctata. 
Figure 16. Hymeraphia? sp, Outline perfect. Body globular and 
ornate. Spines short and probably divided at end. This probably be- 
longs to family.Geodites, but the genus and species cannot be determined. 
I have thought it may be some form of genus Hymeraphia, recent species 
of which have been figured by Carter / 
Figure 17. Chondrilla? sp. Imperfect? Body globular, slightly 
elongated and ornate. Spines, some of which are removed from upper 
surface, are blunt but massive. Size: 0.053 mm. by 0.05 mm.; length 
of spine, 0.0076 mm. This is similar to a recent form Chondrilla sacca- 
formis, figured by Carter,? and is provisionally referred to that genus. 
Figure 18. Geodia? Terana, n. sp. Apparently bilobate. Body 
spherical and ornamented with short spines thickly set in surface of 
body.  Longer spines irregularly arranged on surface, with spreading 
base tapering rapidly to a sharp point. Size: 0.076 mm. by 0.073 mm. ; 
length of spine, 0.015 mm. Nothing similar to this has been found 
figured, yet it probably belongs to Geodia or allied genera. I propose 
the name Geodia? Terana, The specimen is one of raro beauty. 
1 Ann. Mag Nat. Hist., Ser. 5, 1879, Vol. III. Plate XXVI. 
2 Ibid., Vol. IIL, p. 299, Plate XXVI. Fig. 12. 
