440 Happon—The Actiniaria of Torres Straits. 
? PHYLLODISCUS, Kwietn. 
Phyllactide, with a body-wall provided for the greater part with short, 
greatly branched processes, without a marginal fold. ‘‘ Collar” high, with 
ectodermal musculature. Oral dise round, small. Tentacles long, numerous. 
Mesenteries numerous, only the primary meseunteries perfect, and at the same 
time sterile. Sphincter feeble, endodermal, diffuse or absent. Appendages of the 
body-wall with endodermal longitudinal muscles. 
I have copied Kwietniewski’s definition of his new genus (‘ Ein Beitrag 
zur Anat. und Syst. der Actiniarien,’” Inaug. Dissert., Jena. 1897, p. 11.), 
which he has erected for P. Semoni, a new species which he describes, but does 
not figure. It appears to me from Kwietniewski’s description, that this genus 
should be placed in the Aliciidee, but I will not venture to remove it, for the 
present, from the family to which he has allocated it. There are 192 tentacles, 
the mesenteries are in five cycles, of which the six pairs of primaries are alone 
perfect. The second, third, and fourth pairs of mesenteries are alone fertile. 
Kwietniewski states his conviction (J. ¢., p. 11) that Trtactis producta, Klung., is 
allied to P. Semont. Andres placed it in the Phymanthide , but Kwietniewski 
denies that it has anything to do with this family. It is very probably a 
larval form, and I think it is wiser to leave its systematic position an open 
question for the present. 
Family.—DEnpDROMELIDZ, MeM. 
Actiniinze, with a pedal disk ; tentacles simple, arranged in cycles ; the upper 
part of the column, immediately below the margin, provided with dendritic pro- 
cesses (pseudo-tentacles). 
MeMurrich (1889, Journ. Morph., p. 381) instituted a new tribe (Den- 
dromelinze) with the above definition; later he degraded it to a family. The 
family (1893, p. 183; 1896, p. 186) contains the two very remarkable genera, 
Lebrunea, a shallow-water form from the West Indies, and Ophiodiscus, obtained 
by the ‘‘ Challenger” from deep water (2160 and 1375 fathoms) in the Southern 
Pacific. The former has no sphincter; the latter, as described by Hertwig (1882, 
p. 56), has a mesogloeal sphincter, and has its mesenteries specialised ito 
muscular and gonophoric cycles. Hertwig and MeMurrich agree that these two 
genera may eventually have to be placed in different families. 
M*Murrich (/.c. p. 32) says:—‘‘ Duchassaing and Michelotti considered the 
genus Lebrunea to be close to Phyllactis, but such an alliance is unquestionably 
