14 Goeh 
CCELENTERATA. 
organs and no special nervous system were detected ; Korotneff 's inter- 
pretations [Zool. Rec. xiii.] are corrected accordingly. The existence of 
orifices comiecting the four gastro-vascular chambers, and representing 
the circular vessel of jelly-fishes, is* also denied. 
Hydrocorallia. 
Cryptohelia virginis^ sp. n., Lindstrom, Z. c. p. 14, pi. ii. fig. 24 (off Salt 
Island, 200-320 fathoms. C. pudica figured; “ The Atlantic” i. p. 272. 
Stylaster loevis, sp. n., Studer, Z. c. p. 635, pi. ii. fig. 5 (N. of Three 
Kings Island, 90 fathoms) ; verrucosus^ sp. n., id. Z. c. pi. ii. fig. 6 (597 
fathoms) (a Eunice is established in the cavity of the polyparium, as in 
Cryptohelia pudica) ; obliquus, sp. n., id. 1. c. pi. ii. fig. 7 (with S. Icevis). 
According to the detailed investigations of Moseley (11), the only 
living portion of the corallum of Millepora is the superficial part, con- 
sisting of a ramified “ hydrophyton ” with anastomosing branches, in the 
interstices of which the calcareous matter is deposited, probably from the 
ectoderm. The “ tabulae ” of the calicles correspond with the successive 
layers of the corallum formed during growth. [The characters of the two 
kinds of zooids are given in Zool. Rec. xiii. Ccd. p. 10]. A membranous 
lamella separates the ectodermal layer from the endodermal ; the former 
is more or loss studded with nomatocysts of two kinds, those composing 
the tentacular knobs being of the kind most characteristic of the Ily- 
drozoa ; the endodermal cells are of two kinds, large pigmented cells, to 
which the yellow colour of the corallum is due, and smaller transparent 
globules, predominating in the deeper parts of the living “hydrophyton.” 
In the superior portion of the mouthed zooids the endodermal cells 
take the character of “gastric” cells. Longitudinal muscles are seen 
inside the lamella in the zooids, radiating into the branches of the 
hydrophyton communicating with them. There was also seen an appear- 
ance of a set of circular fibres lying externally to the longitudinal, but 
likewise on the inside of the membrane. Ily dr actinia, Podocoryne, and 
Gemmaria are the forms of ordinary Hydrozoa offering, in different ways, 
the most resemblance to Millepora. 
SiPHONOPHORA. 
Physophora borealis, Sars, described and analysed in detail ; Fauna 
littor. Norvegiae, iii. p. 32, pis. v. & vi. figs. 1-8. 
Halistemma tergestinum, sp. n., Claus (4) (Trieste). 
J. H. Mortimer, Notes on Physalia ; P. Liverp. Soc. xxi. pp. 
Ixxv.-lxxvii. 
Athecata (Gymnoblastica) and allied Gymnophtiialmig 
(OrASPEDOTE) MEDUSiE. 
Perigonimus (P) nutans, sp. n., Hincks (9), p. 149, pi. xii. fig. 1 (gono- 
phores unknown). 
Podocoryne carnea, Sars ; id. 1. c. p. 150, pi. xii. figs. 7 & 8. Observa- 
