HYDROZOA. 
461 
tified with certainty; 18 (of which 2 are cosmopolitan) are also found in 
the lliitish seas : 0 nppear to be new, and so far had only been met with in 
the Adriatic ; of these, 5 belon" to Plumnlaria. 
6. IIiNCKs, T. On the Hydroid Lar sahcllarum, Gosse, and its 
reproduction. Op. cit. x. pp. 313-317, pi. 19. 
The substance of this paper, recording the rediscovery of this Hydroid at 
Ilfracoinb, and describing its hitherto unknown blastostyles and planoblasts, 
is incorporated in Allman’s work. The trophosome and gonosome are 
figured. 
7. . Contributions to the history of the Hydroida. Ibid. 
pp. 385-395, pis. 20 & 21. 
8. Kirchenpauer, G. H. Ueber die Hydroidenfamilie Plu- 
mulartd( 2 y einzelne Gruppen derselben und ihre Fruchtbe- 
halter. I. Aglaopheniay Lx. Abh. Ver. Hamb. v. 3, pp. 52, 
8 pis. 
9. Kleinenberg, N. Hydra, eine anatoraisch-cntwickelungs- 
gcscliichtliche Untersuchung. Leipzig: 1872, pp. 90, 4 pis. 
10. Macdonald, J. D. On the anatomy of the nervous sys- 
tem of Diphyes, affording presumptive evidence of the ex- 
istence of a similar system in the other forms of oceanic 
Hydrozoa. Ann. N. H. (4) ix. pp. 114-116, woodcut. 
11. Moulins, C. des. Questions obscures relatives h VHy dr ac- 
tinia ccliinata, Flcm., ct h V Alcyonium donmncula, Link., 
tons deux logcurs de Pagurcs. § 1. Ilydractinies. Act. Soc. 
L. Bord. xxviii. pp. 325-342. 
Attempts to prove the identity of Ilydractinia (Synhydra) with Adamsia 
{Medusa) paUiata, Boh. {Actinia carciniopadus, Otto, A. parasitica, Duj.) ! 
12. Muller, P. E. lagttagelser over nogle Siphonophorer. 
(With a French Kjobenhavn : 1871, pp. 82, 3 pis. 
The author’s observations were chiefly made on Diphyes sieboldi {Eudo.via 
campamdd) and Ahyla pentayona. The stem of the young Diphyes ends below 
in an imperfect ^^polypitc,” with rudimentary urticating filament, but without 
protective scale.” This terminal (oldest) polypite and the cartilaginous 
substance surrounding the '‘juice-reservoir” is, according to him, one indi- 
vidual, the original Medusa, the nurse of the colony, morphologically equiva- 
lent to a true Medusa, or to one of the elements of the colony, viz. a Eu- 
doxia. The Eudoxia, in the same manner, is considered a single individual, 
consisting of a " protective scale,” afterwards assuming the shape of a bell, 
and the polypite answering to the stomach or “ proboscis” of a Medusa. 
The swimming-bells of the Diphyes or Ahyla are morphologically (not func- 
tionally) equivalent to the two sexual Medusa buds of the Eudoxia, the 
whole Diphyid colony having its nearest analogy in a Medusa with prolife- 
rous " proboscis,” e. g. Sarsia gemmifera. This conception of a Siphonophore 
is somewhat between those of Kolliker and Leuckart; and the author dis- 
proves the objections raised against regarding the " scale ” and " stomach ” 
1872. [voL. IX.] 2 H 
