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POPULAR SCIENCE REVIEW. 
an equal number of tentacles, with 8 separated adradial gonads. — Genera, 
Atolla, Collaspis. 
Family 2. Llnergid.®. — R adial sacs broad, with branched, ccecal distal 
canals, without annular canal. — Subf. 1. Linanthida, with 4 interradial, 
horseshoe-shaped gonads. — Genera, Linantha, Linergis : Subf. 2. Linuehidce, 
with 8 separated adradial gonads. — Genera, Liniscus, Linuche. 
Sub-order II. — Semostomje (Yane-mouthed Medusae) : Mouth-tube 
divided into 4 per-radial, folded buccal arms. Central mouth simple, cir- 
cular : sometimes broad radial sacs, without annular canal ; sometimes narrow 
radial canals, with an annular canal : always 4 gonads. Tentacles hollow, 
generally long. 
Family 3. Pelagid.®. — Radial sacs broad, simple, without branched 
distal canals, without annular canal. — Genera, Pelagia , Chrysaora, Dacty- 
lometra. 
Family 4. Cynaneid^e. — R adial pouches hroad, with branched, coecal 
distal canals, without annular canal. Subf. 1. Medoridce , with 8 sense- 
organs, — Genera, Procyanea, Medora, Stenoptycha, Desmonema, Cyanea, Dry - 
monema : Subf. 2. Pateridce , with 16 sense-organs. — Genera, Patera , 
Melusina. 
Family 5. FlosculidvE. — R adial canals narrow, simple, unbranched, 
with an annular canal. — Genera, Floscula, Floresca. 
Family 6. Ulmaridje. — Radial canals narrow, all, or part of them, 
branched, with annular canal. Subf. 1. Umbrosidee, with marginal tentacles, 
which are inserted on the margin of the umbrella between the marginal 
lobes, — Genera, Ulmaris, Umbrosa, Undosa. Subf. 2. Sthenonidce, with sub- 
umbral tentacles, which are inserted upon the ventral side of the velar margi- 
nal lobes, at a distance from the margin of the umbrella, — Genera, Sthenonia, 
Phacellophora. Subf. 3. Aurelidce with exumbral tentacles which are in- 
serted upon the dorsal side of the velar marginal lobes, remote from the 
margin of the umbrella, — Genera, Aurelia , Aurosa. 
Suborder III. Rhizostomje (Root-mouthed Medusa). -Mouth-tube re- 
placed by 8 adradial root-like buccal arms with numerous suctorial 
mouths. Central mouth obliterated. Radial canals narrow, always 
branched, with an annular canal. Gonads always 4 (never 8 !) Tentacles 
absent. 
Family 7. Toreumid.®. — F our subgenital cavities, separated, the bran- 
chial disc forming the floor of the stomach ; suctorial fringes of the buccal 
arms only ventral, on their axial surface, — Genera, Archirhiza, Cephea, Diplo- 
pilu8, Polyrhiza , Cassiopea, Polyclonia , Toreuma. 
Family 8. Pilemidje. — Four subgenital cavities, separated, branchial 
disc forming the floor of the stomach, suctorial fringes of the buccal arms 
dorsal and ventral, both on their axial and abaxial surfaces, — Genera, Pilema, 
Furhizo8toma, Stylonectes, Toxoclytus , Phyllorhiza, Stomolophus. 
Family 9. Versurida:. — F our subgenital cavities, united to form a cen- 
tral portico ; hence the floor of the stomach and the branchial disc are 
separated ; suctorial fringes of the buccal arms only ventral, on their axial 
surface, — Genera. Haplorhiza , Cotylorhiza , Octostyla, Crossostoma, Versura. 
Family 10. Crambessid^:. — F our subgenital cavities, united to form a 
central portico, hence the floor of the stomach and the branchial disc are 
