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REPORT ON ZOOLOGY, MDCCCXLII : 
One sort of appendage serves for swimming, and resembles a hollow 
obtuse cone, which can pump water out and in, by opening and shutting 
its cavity ; the second sort is very complicated, consisting of a pedicle, a 
boat-shaped flap, an irregularly spiral cirrhus, and a number of tender 
very contractile spiral threads, with a larger pear-shaped hollow body, 
which is perhaps for the reception of nourishment ; the third sort con- 
sists of pedicled, smaller, pear-shaped, and very contractile sacs, with 
which some bodies, like clusters of grapes, are in connection. The 
latter contain evident spermatozoa, while the larger pear-shaped bodies 
must contain the ovaries. He has also given some notices on the struc- 
ture of the Stephanomia prolifera, of which Milne Edwards, however, 
found only mutilated specimens at Nizza. 
Hyndman has discovered a new Diphya on the coast of Ireland, 
which he has named Diphya elongata, and characterized thus : — both 
portions of similar form and nearly equal size ; the swimming cavity 
of each likewise similar, and, as well as the nutritive organ, extending 
the whole length of the body. A circulation was discovered, commencing 
in the canal, which originates at the base of the tentacular appendage, 
and continuing throughout the nutritive organ. Costa has also recog- 
nised a distinct circulation in Velella (Comptes Rend. t. 13, p. 533, 
ITnstit. 1841, p. 301, and Ann. d. Sc. Nat. t. 16, p. 187). 
POLYPES. 
We are especially indebted to British Naturalists, during the last year, 
for much interesting information on the anatomical structure and geo- 
graphical distribution of the Polypes. 
Hassall has added a valuable supplement to the catalogue of Irish 
Zoophytes (Ann. Nat. Hist. vol. vii. p. 276 and 363), in which the follow- 
ing species are mentioned: — Coryne squamata ; Hermia glandulosa ; 
Tuhularia larynx ; Thoa muricata ; Sertularia margareta, pumila, 
fiVicida ; Thujaria articulata ; Plumularia pinnata, setacea, catha- 
rina,cristata, myriophyllum, frutescens ; Alcyonidium rubrum ; Acti- 
nia mesemhrianthemuin, hellis, gemmacea, dianthus, maculata ; Anthea 
cereus; ValJceria cuscuta,imhricata,pustulosa; Pedicellina echinata; 
Vesicularia spinosa ; Hippothoa lanceolata ; Anguinaria spatulata ; 
Tiibulipora verrucaria, lohulatai^) ; Cellepora ramulosa, himucronata ; 
Berenice hyalina ; Lepralia nitida, coccinea, variolosa, ciliata, ap- 
pensa, pediostoma, insignis, cylindrica, punctata, linearis ; Membra- 
nipora stellata ; Flustra truncata, avicularis, lineata, tuberculata, 
distans, carnosa, hibernica ; Alcyonidium gelatinosum, hirsutum, 
parasiticum, echinatum. 
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