[ph] MEDUSH FROM THE GULF STREAM. 523 
PoLYCANNA AMERICANA,* Fewkes. 
_ Of all the specimens of the species examined in the collection of 1885, 
No. 11674, station 2563, is the best preserved. A diagnosis of the spe- 
cies is made from this specimen. 
Disk flat, with a slight apical protuberance. Roof of the stomach 
convex, thicker than the margin. Diameter of the roof of the stomach, 
28™™, Diameter of the disk, 70™™. Stomach wide, lips open. The 
stomach wall is formed by papillate folds, the number of which is equal 
to the tubes. These tubes fall down below the velum. Numerous (107) 
chymiferous tubes, each of which bears a folded sexual gland, reaching 
from the vicinity of the stomach to the marginal vessel. 
Tentacles, 29-32? in number, long, base inflated. Between each pair 
of tentacles there are five or more small protuberances on the bell mar- 
gin. These are either otocysts or immature tentacles. No subumbral 
tubercles on the umbrella, between the chymiferous tubes. 
Of the other recorded Polycanne, P. grenlandica, P. flava, and P. 
crassa have more tentacles than chymiferous tubes. No tubercles are 
recorded in P. flava. In an alcoholic specimen of Zygodactyla, with 
tubercles, now in the collection of the Museum of Comparative Zoology, 
the tentacles are missing. I cannot, therefore, say at present whether 
the specimens with tubercles have the same number of tentacles as 
tubes or not. If the Zygodactyla, with tubercles, last mentioned, has 
more tentacles than tubes it may be grenlandica; if less, it is doubtful 
whether it is the same as the species (grenlandica) which is recorded 
by A. Agassiz as possessed of more tentacles than tubes. 
Family AMPHINEMIDA, Heeckel. 
STOMATOCAT PERIPHYLLA, Heeckel. 

Gatslngre Station. | North latitude. | West longitude. 

° / uv fo} i Mu 
15229 2711 388 59 00 70.07 00 
15253 2713 38 20 00 70 08 30 

Two well-preserved specimens of this species were found by the 
Albatross in the summer of 1886. 
We have in our waters two very beautiful genera of the family of 
Tiaridx, with two opposite tentacles. One of these is the well known 

*This species is supposed to be the same, or closely allied to the genus once called 
Rhegmatodes, now Polgcanna. It is given the former name in the plates, the latter 
in the text of Hackel’s System der Medusen. The species falls in Heckel’s subgenus 
Rhacostoma (L. Agassiz, sensu mutato) and may be the same as P. fungina, Heck. 
t The spelling, Stomatoca, is adopted instead of Stomotoca, from the derivation 
Gzbua (gen. OréuaroS) root Groat, 
