Happon AND Durrprn—Some Actiniaria from Australia and other Districts. 158 
parieto-basilar muscles are well shown. Large oval nematocysts are abundant 
in some of the mesenterial filaments, but do not stain. 
The mesogleea varies considerably in thickness ; towards the body-wall it is 
quite thick (Pl. vut., fig. 9), but afterwards thins suddenly, becoming quite linear 
in section. 
The irregularity in the arrangement of the mesenteries will be apparent 
when the enumerations of the following three specimens are compared to- 
gether :— 
(a). D. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 17, 12, 13, 14, 15, 16, 17. 
(0). D. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27. 
(c). D. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, D, 11, 12, 13, 14, 15, 16, 17, I8. 
The first is a young specimen in which the mesenteries are uniformly long 
and short. In the first two there is only one pair of directive mesenteries ; 
whereas, in the last there are two pairs: in all cases the short mesenteries are 
indicated by italic figures. 
Gonuds.—Female gonads were present in only one specimen. 
No detailed anatomical account of any member of this genus has as yet been 
published, but one of us has made sections of the type species C. viridis, Allm., and 
of C. hoplites, Hadd. and Shack. 
The new species differs from @. viridis in possessing a thick mesogloea in the 
body-wall, and in the very thick proximal portion of the mesoglcea of the mesen- 
teries. The upper portion of the sphincter of @. viridis* (PI. vuit., fig. 11) projects 
inwards with thin simple mesoglceal plaitings ; in other words, the lower part of the 
sphincter is feeble and diffuse, while the upper part is a simple circumscribed endo- 
dermal sphincter muscle. 
In C. hoplites the sphincter is much more deeply folded than in our species, 
but the retractor muscle of the mesenteries is feebler. 
Family, ALICIID. 
Hexactiniz with a large, flat, contractile base. Tentacles simple, cylindrical, 
and entacmzous. Column with simple or complex hollow processes or vesicles 
over the greater part of its surface, arranged mostly in vertical rows. No cinclides. 
* Since the above has gone to press, we find that Herr Casimir R. Kwietniewski has published a paper 
entitled ‘* Revision der Actinien, welche yon Herrn Prof. Studer auf der Reise der Korvette Gazelle um 
die Erde gesammelt wurden,” Jenaische Zeitschr. xxx., p. 583. He figures the sphincter of Corynactis 
carnosa Studer (Monats. K. Akad. Wiss. Berlin, 1878, p. 542), and it will be seen that it differs from that 
of our species, but very closely resembles that of C. viridis. This appears to us to be sufficient evidence 
to regard our species as distinct from Prof. Studer’s. 
