CaSLENTERATA. 655 
9. Plumulariidae. Genera Antennulariaf Lamk. ; Aglaojpheniuy 
Lamx. ; Plumxilaria, Lamk. 
Suborder III. Gymnochhoa. Hydroida destitute of polypary, locomotive. 
Family 1. Hydridee. Genus Ilydra^ Linn. 
New genera and species : — 
Hydranthea, g. n., Hincks, 1. c. p. 99, for Atractylis agarica^ Hincks. 
LovSnellttf g. n., Hincks, 1. c. p. 177, for Campanidaria clausa^ Lov^n. 
Opcrcularellaf g. n., Hincks, 1. c. p. 193, for Cainpanularialacerata, Johnst. 
Filclhtmf g. n., Hincks, 1. c. p.214, for Rcticidaria Wy. Thomson, = 
Campanularin ncrpcns, Hnss. 
ITydrallmania, g. n., Hincks, I, c. p. 273, for Scrtularia falcata, Linn. 
Ohelia plicata^ sp. n., Hincks, 1. c. p. 169, pi. 80. fig. 1, Shetland. Referred 
provisionally to this genus. 
Campanulina tiirrita, sp. n., Hincks, I, c. p. 190, pi. 36. fig. 2, Holywood, 
Belfast. 
Lafoea podllum, sp. n., Hincks, 1. c. p. 204, pi. 40. fig. 2, Oban Bay ; X. 
pygmoitty Alder, MS., Hincks, 1. c, p. 205, pi. 40. fig. 3, Tynemouth, Sark. 
Cuspiddla grandh, sp. n., Hincks, 1. c. p. 210, pi. 40. fig. 4, Connemara j 
C. costata^ sp. n., Hincks, 1. c. p. 210, pi. 40. fig. 6, Whitby, 
Halecium plumosum, sp. n., Hincks, 1. c. p. 227, pi. 64. fig. 1, Ireland. 
Podocoryne prohoscidea, sp. n., Hincks, I, c, p. 317, pi. 23. fig. 4, Ilfracombe. 
Hydra. For somo remarks on the muscular structure of Hydra^ see 
Ratzel’s “ Histologischo Untersuchungen an niederen Thieren,” Zeitschr. f. 
wissensch. Zoologie, Bd. xix. p. 272, tab. 23. figs. 20-22. 
PuYSOPHORIDiE. 
AgalmideSy 'Rr^m{{i, — Stephanomidai, Huxley. Hiickel, L c. 
p, 48, arranges this family thus : — 
Subfamily 1. Halistemminje. Terminal threads of the stinging-organs 
simple. 
Genus 1. Forskaliaf Hack. Swimming-bells in many rows j stinging-organs 
naked. 
Genus 2. Halistemmay Huxley. Swimming-bells distichous j stinging-organs 
naked. 
Genus 3. Siephanomuiy Pdron and Losueur. Swimming-bells unknown j 
stinging-organs covered by nn involucre. 
Subfamily 2. CRYSXALLODiNiE. Terminal threads of the stinging-organs 
double, with a pouch-like body between the two terminal threads ; stinging- 
organs covered by an involucre. 
Genus 4. Agalm(ypsis, Sars. Ccenosarc highly contractile and shortened, with 
leaf-Uke, thin, widely separated bracts ; polypites dispersed spirally on 
the ccenosarc j stinging-filaments leaving the stem on all sides. 
Genus 5. Agalma, Eschscholtz. Ccenosarc rigid and not much contracted, 
with wedge-shaped thick bracts one over the other ; polypites spirally 
dispersed on the stem; stinging-filaments suspended only from the 
distal end of the ccenosarc. 
Genus 6. Crystallodes, gen. nov., Hackel, 1. c. p. 43. This genus is inter- 
mediate between Agalma and Stephanomia ; ccenosarc rigid and not per- 
