IIYDROZOA. 
471 
New genera and species : — 
Actinogoniunij Allman, 1. c. p. 95. Gonophores giving origiti to actinuloid 
bodies, shaped like a cuttlefish with four arms, and hydroid — consequently 
developing from an actinula instead of from a planula. Type Sgncorgne im- 
stlla, Van Beneden (nec Coryne pusilla, Gaertner). 
Gymnocoryne, Hindis, 1. c. p. 75. Polypites clavate, sessile, rising imme- 
diately from a filiform stolon, invested by a delicate chitinous polypary j 
tentacula clavate, very numerous, the uppermost furnished with large capi- 
tula, and forming a circle round the oral extremity, the rest scattered over 
nearly the whole of the body. Type G. cot'onata, id. 1. c. p. 76, pi. 6. figs. 1 
& la, Salcombe Bay. 
CladocorynCf W. D. Botch, Ann. N. II. (4) vii. p. 227. Allied to Zanclea ; 
intermediate between the Corynidm and Stauridiidw. Stem simple or 
branched, rooted by a creeping filifonn stolon, the whole sheathed in a thin 
chitinous tube, smooth or very sparingly annulated. Polypites terminal, 
clavate, with simple and branched capitate tentacula ; the former set in a 
single row round the mouth, the latter in several whorls round the body, 
and inulticapitate ; with a prominent tubercle composed of thread-cells 
between each tentacle in the anterior and in the posterior rows. Beproduc- 
tion unknown. Type C.Jloccosaj id. 1. c. p. 228, Herm, near Guernsey. 
Schizocladiumj Allman, Q, .1. Micr. Sci. xi. p. 18. Campanularidcey allied 
to Ohelia. Trophosome : hydrocaulus rooted, branching, carrying besides 
the hydranth-bearing ramuli, others (fissiparoiis appendages) which spring 
from various parts of the hydrocaulus, and are cylindrical, simple, and never 
support either a hydranth or a generative bud. Ilydrothecre with inoper- 
culate orifice. Gonosome unknown. Type S. ramosumy id. 1. c. pi. 2, Loch 
Long, Scotland, attached to buoys. (Its mode of reproduction by a fissiou- 
frustule is fully described.) 
Campanularia calculiferay Ilincks, 1. c. p. 78, pi. 6, Salcombe Bay. 
SiPHONOPHORA, 
I’he stomachic cavity of some Siphonophora is lined with cilia, which ap- 
pear to be intended to pump fluid into a system of vacuola. Figures are 
given of portions of the internal structure of Apolemia contorta and uvariay 
Forskalia edwardsi, JDiphyeSy sp., and Hippopodius neapoliianus. W. Bonitz, 
Arch. Anat. Phys. 1871, pp. 83-89, pi. 3. 
Hippopodius gleha. Young larva described by E. MetschnikofT, Bull. 
P6tersb. xv. p. 503. 
Velella spirans. On the structure of its medusid germ, cf. A. Stuart, 
Nachr. Ges. Getting. 1870, pp. 101 & 102. There is an internal cavity sepa- 
rate from the stomach, which opens further into the canals of the vascular 
system, [(y. Zool. Bee. vii. p. 490.] 
Discophoba. 
Aurelia aurita. On its development from the embryo form formerly known 
as Strobilaf cf. F. E. Schulze, Arch. Ver. Mecklenb. xxiii. pp. 205-208. 
A. Bbandt (‘MJeber fossile Medusen,” M6m. P^tersb. ivi. no. llj pp. 28, 
