No. 437.] . VORTH AMERICAN INVERTEBRATES. 339 
PELAGID/. 
10. Marginal tentacles 8; marginal lobes 16, . . . . - - Pelagia. 
11. Marginal tentacles 24; marginal lobes 32, . . . - - Chrysaora. 
12. Marginal tentacles 40; immature specimens, often less in younger 
individuals maremal lobes 46, 795°. = = 2 4 - Dactylometra. 
Ephyroides rotaformis Fewkes. 1854. 
Report U. S. Fish Commission, p. 949: 
Among meduse of the Gulf Stream Fewkes has described what is con- 
sidered by him a new genus and species of an Ephyra-like medusa. 
The generic characters given are somewhat indefinite, no mention being 
made as to gonads, radial pouches, sense organs, etc. The following brief 
notes are condensed from the above cited report: 
Umbrella flat discoid, and viewed from the aboral pole comprises three 
zones:——‘« Discus centralis; Zona coronalis; Zona marginalis.” The 
last named zone is marked by definite marginal lappets of large size with 
rounded outlines twice as long as broad, and 16 in number. Interposed 
between the lappets are a similar number of gelatinous elevations, ‘“ socles,” 
ending a short distance from the deepest point of the marginal incision and 
abutting the line of junction of the discus centralis and zona coronalis. The 
marginal lappets are supported at their base by a pair of gelatinous “ socles.” 
Distribution. — 
Nausithoé punctata Koll. 
Bull. Mus. Comp. Zool. Vol. XXXVII, p. 67. 
Umbrella flat, g-10 mm. broad. Marginal tentacles 8, stiff, about 7 mm. 
long. Rhopalia 8, alternating with the tentacles. Marginal lappets 16, 
long and flexible; gastric pouches 16, simple, and extending to the lappets. 
Mouth simple, quadrate, devoid of lobes or tentacles. 
Distribution. — Bahama and Tortugas Islands. (Mayer.) 
Nauphantopsis diomedee Fewkes. 1884. 
Op. cit. p. 946. 
From a fragmentary specimen collected by the Albatross in the Gulf 
Stream Fewkes has proposed the new genus and species here mentioned. 
The following very brief synopsis of characters are condensed from his 
description. Report U. S. Fish Commission 1884. 
Umbrella high disk-shaped, with marginal walls probably somewhat ver- 
tical. Marginal lobes 32. Tentacles 24, rhopalia probably 8. 
Distribution. — Lat. 38° N., long. 69° W.; depth 2.033 fathoms. 
