No. 437.| WORTH AMERICAN INVERTEBRATES. 337 
oped, but without distinguishable canals, supported by frenulze 
on the inner perradial corners of the sub-umbrella. Gonads 
were undeveloped, and no distinguishable gastric filaments were 
present. 
In color the specimens were light amber being darker on the 
tentacles. 
As pointed out in the description before cited, the specimens 
under consideration show many points of difference or contrast 
as compared with typical Charybdea species. Mayer who has 
described a similar species from the Tortugas ascribes this to 
immaturity. This has seemed to me somewhat doubtful, and 
some hesitancy was entertained as to whether they probably 
come within the Charybdeidz ; but in the absence of specimens 
in sufficient numbers or undoubted maturity it seems impossi- 
ble to more definitely settle the problem. 
-Mayer has described two species from the Tortugas, namely, 
C. aurifera and C. punctata. Both species were based on single 
specimens and both seemed immature. Hence the same doubt 
rests upon these as upon the previous species. A comparison 
of Mayer’s figures, Bull. Comp. Zool, XXXVII, No. 2, will 
show many points of similarity and suggests close relationships. 
SYNOPSIS OF SUB-—ORDERS AND FAMILIES OF DISCOMEDUS&. 
Sub-order 1. CANNOSTOM. 
Discomedusz with simple, quadrate mouth, devoid of oral lobes or tenta- 
cles ; marginal tentacles short, solid. 
Family EPHyRID#. Radial pouches usually 16, broad and simple; no 
marginal canal. Chiefly deep-sea forms, occasionally taken at the surface. 
Family LINERGIDA. Radial pouches broad, terminating in numerous 
branching, blind distal canals. 
Sub-order 2. SEMOSTOM. 
Discomeduse with quadrate mouth, and with elongated, oral arms, or 
lobes, which are often complexly folded and frilled: marginal tentacles 
hollow, often very long. Marginal lobes usually 8. 
Family ULMARID#&. Radial canals of small size, but usually numerous 
and branching, the branches often anastomosing into an intricate network 
and finally uniting with a definite marginal canal. 
