HYDROZOA AND CTENOPHORA. 
Gael. 7 
Medusae, as the generative individuals, the polyps beiug asexual ; but if 
the observations above recorded are true, and should be proved to have the 
universal occurrence that De Yarenne believes they have, the view now 
usually held, that there is an alternation of generations among the gymno- 
blastic and calyptoblastic Hydroids, must be given up, asexual buds and 
sexual generative products both arise in the trophosome ; the latter, 
however, become collected in specialized buds, which may, to the obvious 
advantage of the species, become detached, and actively encounter, and 
even acquire, a higher organization than the attached trophosomes. 
41. Weismann, A. Sur de3 organes particulars de VEudendrium 
racemosum. Arch. Sci. nat. (3) vii. pp. 103 & 104, and Ann. N. H. 
(5) ix. pp. 201 & 202. [Zool. Rec. xviii. Coil. p. 7.] 
New genera and species : — 
Sub-Class HYDROMEDUSiE. 
Order i., Gymnoblastea-Anthomedusac. 
Calyptospadix , g. n., S. F. Clarke, (6) p. 136. 
Trophosome. Hydrophyton consisting of a branching hydrocaulus 
rooted by a creeping filiform hydrorhiza. Hydranths fusiform, with 
filiform tentacles, which are arranged in a single verticil round the base 
of a conical hypostome. Perisarc developed into large hydrotheca-like 
processes. 
Gonosome. Sporosacs developed on the ultimate ramuli beneath the 
terminal hydranths. 
C. cerulea , sp. n., Clarke, (6) p. 136, pi. vii. figs. 1-9, Fort Wool, 
Virginia. This form presents a very close approximation to the Caly- 
ptoblasfcea of Allman. 
Eudendrium corneum , sp. n., Clarke, (6) p. 137, pi. vii. figs. 10-17, 
Fort Wool, Virginia. 
Sytlactis arge , sp. n., Clarke, (6) p. 138, pi. viii. figs. 18-20, Crisfield, 
Maryland, on the Chesapeake Bay. 
Lovenella gracilis , sp. n., Clarke, (6) p. 139, pi. ix. figs. 25-39. 
Bougainvillia rugosa, sp. n., Clarke, (6) p. 140, pi. viii. figs. 21-24, 
Hampton Roads, lower part of Chesapeake Bay. 
Calycopsis , g. n., Fewkes, (12) p. 304; for C. typa , sp. n., id. ibid., pi. i. 
fig. 34, Coast of New England. 
Halitiara , g. n., Fewkes, (11) p. 276 ; for H. formosa , sp. n., id. ibid. 
pi. iv. fig. 2, Tortugas. 
llalicalyx , g. n., Fewkes, (11) p. 277; for II. tenuis, sp. n., id. ibid. 
pi. vii. fig. 15, Key West, Florida. 
Podocoryne hceckeli, sp. u., Hamann, (17) p. 519, pi. xxiv. figs. 15 & 16, 
Naples. 
Order ii., Calyptoblastea-Leptomedusac. 
Sertularia minuta, sp. n., Bale, (2) p. 21, pi. xii. fig. 1, Sorrento, S. E. 
Australia ; S. pumiloides , sp. n., Bale, (2) p. 21, pi. xii. fig. 2, Queens* 
1882. [vol. xix.] e 3 
