ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
603 
example of the Hemichorda from New Zealand, and the first represen- 
tative of the genus as yet reported from the Southern Hemisphere. The 
proboscis is deeply grooved along the whole of its dorsal surface ; the 
proboscis-cavity extends right to the tip of the organ ; the longitudinal 
muscles of the proboscis form a very narrow band close to the wall ; 
there is but a single proboscis pore ; there are no median gonads ; there 
is a single pair of intestino-tegumentary canals ; the arms of the sub- 
notochordal skeleton reach backwards to the level of the collar-pore. 
“Notochord” of Cephalodiscus.* — Dr. A. T. Masterman returns 
to the discussion of the points at issue between Dr. Harmer and him- 
self. Further investigation of Cephalodiscus has convinced him that the 
pericardium of this form is homologous with the proboscis-vesicle of 
Balanoglossus, and therefore the comparison of the latter with the sub- 
neural gland of Cephalodiscus must be given up. Again, Masterman has 
so far modified his views on the homologies of the notochord ( = sub- 
neural gland) of Cephalodiscus as to now believe that this organ is 
equivalent to the vermiform process of the “ Eicheldarm ” in Schizo- 
( ardium , Glandiceps, and Spengelia. Masterman reaffirms his belief in 
that view of the homology of the “notochords” of Cephalodiscus indi- 
cated in the name Diplochorda, and believes that the Knteropueusta will 
be found to fall into this group as well as Cephalodiscus , Phoronis, and 
Bhahdopleura. 
Budding in Ectoproctous Bryozoa.f — Herr Franz Ladewig, in a 
preliminary note, indicates the chief differences between his own obser- 
vations and those of Calvet. According to Calvet J the bud originates 
from proliferated ectoderm cells which grouj) themselves round mesen- 
chymatous elements in the body-cavity of the mother-polype. Ladewig, 
on the contrary, finds that the bud originates from an ectodermic in- 
vagination in the way described by Nitsche and Claparede. His 
observations also confirm Nitsche’s view that the avicularium corre- 
sponds to the nerve-organ of an aborted polypide. 
Echinoderma. 
Development of Echinoids.§ — Prof. E. W. MacBride has succeeded 
in rearing larvse of Echinus esculenius and E. miliaris up to the latest 
(duteus stage. He gives clear drawings of the two species at different 
stages, and points out the minute differences between them. The eggs 
of E. miliaris are smaller than those of E. esculenius, and it was not 
found possible to keep the larvae alive so long in the former as in the 
latter case. The difference seems to depend upon the smaller supply of 
food-yolk in the eggs of E. miliaris. 
Ccelentera. 
New Unattached Marine Hydroid.|| — Mr. L. Murbach describes a 
new form of marine hydroid, Hynolytus peregrinus g. et sp. n., which he 
found at Wood’s Holl. It is, in the first place, remarkable in being 
unattached, thus resembling Protohydra leuckartii and Halermita cumu- 
* Zool. Anzeig., xxii. (1899) pp. 359-68. Cf. this Journal, 1898, p. 81. 
+ Tom. cir., pp. 355-7. ' j Cf. this Journal, 1898, p. 632. 
§ Quart. Journ. Micr. Sci., xlii. (1899) pp. 335 9 (1 pi.). 
|| Tom. cit., pp. 311-60 (1 pi.). 
