356 Rev. T. Hincks’s Contributions towards a 
reous instead of chitinous, as it 7s in Hydractinia calcarea, 
then the identity in structure with Parkeria would be so far 
complete. 
Thus, although Parkerta cannot be identified with Cauno- 
pora, there is still no reason whatever why it should not be 
indirectly connected through Hydractinia with Stromatopora 
by being a Hydroid, if I am right in assuming that the animal 
of the latter was of this nature (‘ Annals,’ 1878, vol. ii. 
p- 304 &c.). 
With reference to the examination of the microscopic 
section of Stromatopora mamillata, Fr. Schmidt (Rosen, 
‘Ueber die Stromatoporen,” p. 71 &c., Taf. viii.), I have 
only to repeat what Nicholson and Murie, in their excellent 
memoir, have already stated, viz. that the skeleton of Stroma- 
topora is ‘composed of non-spicular, granular, calcareous 
matter” (Linn. Soc. Journ. Zool. 1878, vol. xiv. p. 241). 
Selecting a rolled portion, from the ‘ Parson and Clerk” 
rocks at Teignmouth, of the species above mentioned, in which 
the so-called ‘ hexactinellid structure’’ is sharply defined, I 
thought, as I had lately been successful in bringing out the 
spicules of the fossilized Calcispongie of the Coral Rag from 
Faringdon, that I might be equally successful in doing so 
with Stromatopora under similar circumstances, if there were 
any present; but although the slice was reduced almost to 
transparency, the skeletal fibre of the Stromatopora through- 
out never presented any thing but a granular composition, 
the minute grains of which contrasted strongly with the clear 
rhomboid crystalline calespar of the intervening spaces, 
without the most remote trace of any kind of sponge-spicule 
in any part. 
XLI.— Contributions towards a General History of the Marine 
Polyzoa. By the Rev. THomas Hincxs, B.A., F.R.S. 
[Continued from vol. xi. p. 202. ] 
[Plates XIII. & XIV. ] 
XII. POLYZOA FROM INDIA (coast of Burmah). 
A small gathering of Polyzoa from an island in the Mergui 
Archipelago, off the coast of Burmah, obtained by Dr. J. 
Anderson, F.R.S., Superintendent of the Indian Museum, 
Calcutta, has been placed in my hands for examination by 
