HYDROZOA. 
Coel. 1 5 
tions on the spiral and filamentary appendages ; the spiral ones are, 
apparently^ as in Hydractinia, only present in mature individuals. 
Note on Acliaradria larynx \ id. 1. c. p. 151. 
Rhizoragium roseum^ Sars [Zool. Rec. x. p. 513], Fauna Littor. Norv. 
iii. p. 28, pi. iv. figs. 37 & 38. 
Myriothela phrygia (Fabr.), Sars, 1. c. p. 23, pi. ii. figs. 29-36. Specific- 
ally, perhaps generically, different from the species examined by Hiiicks 
and Allman, viz.: Spadix coeJesi, Vig., [cf. Zool. Rec. x. p. 513]. The 
principal differences are the entirely naked hydranth, without any invest- 
ment by a perisac, but fixed through stolon-like filaments, and the single 
or clustered sac-like gonophores, containing embryos of the same character 
as in the British form. (The characters of the Arctic form will, however, 
probably require a revision with reference to the remarkable structures 
lately demonstrated in the British species). 
Hydraclinia calcarea, sp. n., Carter (2), p. 60, pi, viii. figs. 4-6 (cal- 
careous ! on shells habited by hermit crabs. Cape Palmas) ; IT. pliocena, 
Alim., and a cretaceous species, II. vicarii, sp. n. (/. c. p. 53, pi. viii. fig. 11), 
are also described. 
Oo [r] rhiza, g. n., Mereschkowsky (10), provisionally announced, allied 
to Podocoryne and Hydractinia^ distinguished by having sporosacs with 
a single ovum, rising immediately from the hydrorhiza, without the 
introduction of a blastostyle. 
Ttihularia elegans^ sp. n., Clark (3), p. 253, pi. xxxviii. fig. 2 (Cali- 
fornia). 
Coryinorpha nutans, Sars, F. litt. Norv. iii. p. 2, pi. ii, figs. 25-28 ; sarsi, 
Stp., p. 4, pis. ii. figs. 18-24, & iv. figs. 9-23 ; anmiUcornis, Sars, 
p. 8, pi. i. figs. 7-13 ; glacialis, Sars, p. 11, pis. i. figs. 14-22, &. ii. 
figs. 1-7. (All previously recorded and described Norwegian species ; 
characters chiefly from the gonosome.) 
Steenstrupia glohosa, Sars, 1. c. p. 20, pi. i. figs. 1-6 ; perhaps the gono- 
some of a Corymorpha. S. lineata, Leuck., figured by Spagnolini, pi. i, 
figs. 1-4, as are likewise Sarsia pulcliella, Forb. {1. c. pi. ii. figs. 1 & 2), 
Dipur ena dolichog aster, Hack. (pi. ii. fig. 3), Oceania piledta, Rer. (pi. iii. 
figs. 1 & 2) (also by Claus, pi. xi. figs. 46 & 47), and Jlavidula, P6r. (pi. iii. 
figs. 1 & 2) ; Eleutheria dichotoma, (pi. iv. fig. 2). 
Monohranchus, g. n., Mereschkowsky. Hydrocaulus not developed, 
hydranth cylindrical, truncated above, with a single filiform tentacle ; 
mouth central, without lobes ; gonophores without blastostyles ; medusi- 
form planoblasts, with four radiating canals, sixteen tentacles, and eight 
generative sacs, two from each radiating canal ; hydrorhiza consisting of 
a continuous expansion, not composed of a mass of anastomosing stolonic 
tubes. M. parasitus, sp. n., id. (10) (White Sea, on Tc^/tna-shells). 
Bimeria humilis, sp. n., Allman (1), p. 8, pi. v. figs. 3 & 4 (Tortugas) ; 
P gracilis, sp. n., Clark (3), p. 252, pi. xxxviii. fig. 3 (California). 
Eudendrium eximium, sp. n., Allman, 1. c. p. 6, pi. i. figs. 1 & 2 (off 
Florida Reef, 43 fathoms) ; exiguum, sp, n., id. 1. c. pi. ii. figs. 1 & 2 (off 
Key West, 135 fathoms) ; attenuatum., sp. n., id. 1. c. pi. ii. figs, 3 & 4 (off 
Tortugas, 60 fathoms) ; laxum, sp. n., id. 1. c. p. 7, pi. iii. (off Sand Key, 
100 fathoms) ; gracile, sp. n., id. 1. c. pi. iv. figs. 1 & 2 (Shot Key, 3-4 
1877. [voL. XIV.] c 4 
