778 
ZOOLOGICAL LITERATURE. 
the ordinary kind, destitute of tentacles and cilia, and incapable of loco- 
motion. H, conyhearei (n. sp.). 
Monocaulos (Allman, 1. c. p. 370). Trophosome : Polypite solitary, borne 
on the summit of a simple rooted hydrocaulus ; both hydrocaulus and hy- 
drorhiza invested by a very delicate periderm ) polypites flask-shaped, with 
two sets of filiform tentacles — a proximal set longer and thicker, and ar- 
ranged in a single verticil near the base of the polypite, and a distal set 
shorter and thinner, and scattered over a zone close to the summit ef the 
polypite. Gonosome: Gonophores adelocodonic, on simple or branched 
peduncles, which spring from the body of the polypite at the distal side of 
the longer tentacles. Type M. glacialis (Sars, sp.). 
Gonoihyrcea (Allman, /. c. p. 374). Trophosome: Hydrocaulus. branching, 
rooted by a filiform hydrorhiza ) hydrotheca bell-shaped, Avith entire or ser- 
rated margin, and destitute of operculum j tentacula surrounding the base of 
a large, very contractile metastome. Gonosome : Gonophores adelocodonic. 
Sporosacs in the form of imperfect medusae (meconidia), carrying round the 
rudimental codonostome a circle of filiform tentacula, and, Avheu mature, 
supported on the summit of the gonangium, where they lie entirely external 
to its cavity. Type G, loveni (Alim.). 
Leptoseyphus (Allman, l.c. p. 378). Trophosome: Hydrocaulus simple or 
branching, attached by a creeping filiform hydrorhiza j hydrothecae with an 
operculum composed of converging lanceolate segments. Polypites cylin- 
drical when extended; tentacula surrounding the base of a conical nieta- 
stome. Gonosome : G onophores phanerocodouic. Umbrella, at the time of 
liberation, deep bell-shaped or conical ; manubrium pendent from a conical 
projection from the roof of the umbrella, of moderate size, with the mouth 
surrounded by four short capitate tentacula; radiating canals four, each 
terminating distally in a bulb, without evident ocellus, each bulb giving 
origin to a cluster of two or three tentacles; a single marginal tentacle Avith 
a bulbous base is also developed from the centre of each interradial space. 
Type L. tenuis (Alim.). 
Glossoeodon (Haeckel, 1. c. p. 26). Body with four similar segments ; four 
radial canals. No blind centripetal canal on the circular canal. Eight 
marginal bodies. Four or eight tentacles. Mouth-peduncle in the form of a 
long, solid, gelatinous tongue (Zungenkegels) hanging down fr-om the oral 
orifice. There are tAvo subgenera, Glossoconus and Glossoeodon, distinguished 
by the number of tentacles. 
Carmarina (Plaeckel, 1. c. p. 32). Body of six similar segments ; six radial 
canals. From the circular canal to the radial canals proceed blind centripetal 
canals varying in number. Twelve marginal bodies. Six or tAvelve tentacles 
(in one larval form eighteen). Tongue-like process as in Glossoeodon. 
Merona (Norman, 1. e. p. 261). Trophosome: Coenosarc consisting 
of erect or semierect simple tubes, which arise at intervals from a creeping, 
filiform hydrorhiza, the whole invested by a chitinous periderm. Polypites 
issuing fr-om the distal extremity of the tubes, claviform, with scattered 
filiform tentacula. Gonosome : Gonophores consisting of mulberry-like 
masses of sporosacs supported on short gonoblastidia, which arise from short 
tubular openings in the hydrorhiza. Sp. M. eornaeopice (Norm.). 
