502 
MR. H. N. MOSELEY ON THE STRUCTURE OP THE STYLASTERIDHL 
C. Style of one of the dactylozooids, seen in section. 
B. Large canals of the coenosarc, occurring in the pseudosepta or 
intervals between the dactylopores. 
S. Surface layer of the ectoderm. The main mass of tissue is composed 
of the finer ramifications of the coenosarcal meshwork. 
Fig. 13. Small portion of the coenosarcal meshwork of Sporadopora dichotoma, greatly 
magnified in order to show the histological structure ; as seen in osmic 
acid preparations. 
C. Channel of the canal. 
En, En. Endoderm layer. 
M M. Membranous layer. 
E E. Ectoderm. 
T. Nematocyst in process of development. 
Fig. 1 4. I'wo pigmented cells of the endoderm of the same, highly magnified. 
Postscript. 
(Added September 24, 1878.) 
Since the above paper was written, I have been able to examine the structure of 
the soft parts of a species of Distichopora (D. Violacea ) of which I obtained specimens 
preserved in spirits from the Museum Godeffroy, in Hamburg. 
The structure of the soft parts is essentially similar to that in Errinct. In the 
dactylozooids, however, which are stoutly formed, there is present an excessively long 
muscular slip which runs down very far into the long tubular pores, and must be attached 
at the bottoms of these. The gastrozooids are short and cylindrical, with four small 
clavate tentacles. The gonophores appear identical in structure to those of Errina 
and Pliobothrus. Both male and female specimens were examined. The latter are 
distinguished by the prominence of the ampullae. In the males, the ampullae are 
invisible from the anterior, being sunk beneath the surface. All stages of develop- 
ment of the ova were seen, and they appear identical with those of Errina and 
Pliobothrus. In the male no spadix was made out within the gonangia, but these 
contained four or five ovoid masses full of spermatozoa and their parent cells. 
Amongst the corals dredged by the ‘ Challenger ’ is a Distichopora which I had not 
seen until after the present paper was written, which I have named 1). irregularis, in 
which the lines of pores are unusually irregular in their disposition, and traverse 
the faces of the flabellum all over as well as the edges of the branches as usual. 
Further, specimens in spirit, of Lepidopora cochleata, and Pliobothrus tubulatus, were 
most kindly sent to me by Count de Poitrtales, and I was able to determine some 
points in the structure of the soft parts of these, though they were not completely 
