ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
51 
collection, like others which have preceded it, affords evidence of the 
limited habitat of many species of Holothurians. 
Crinoids of Port Phillip.* * * § — A Port Phillip Biological Survey Com- 
mittee has been formed, and twenty-nine specimens of Crinoids were 
sent to Dr. P. H. Carpenter, who refers them to five species, one of 
which is probably new. Aniedon macronema is for the first time recorded 
from this locality. 
Anthozoa. 
Rate of Growth of Corals-t — Prof. A. Agassiz has had the oppor- 
tunity of examining some corals attached to a cable which has been laid 
down about seven years. Orbicella annularis grew to a thickness of 
2J in. in about seven years. Manicina areolata shows a rapid, and 
Isophyllia dipsacea a still more rapid rate of increase. 
Corals of Tizard and Macclesfield Banks.J — Mr. P. W. Bassett- 
Smith, R.N., has a report on the corals obtained by him when on board 
H.M.S. ‘ Rambler,’ from the Tizard and Macclesfield Banks in the China 
Sea. One hundred and twenty-nine species of Madreporaria were 
obtained, and of the genus Madrepora there were as many as thirty-one 
species. Perhaps the most notable fact with regard to this collection is 
the number of species which have been found living at depths greater 
than 30 fathoms, which depth has until lately been supposed to be the 
limit of deep-building corals. Nineteen species have, however, been 
found between 31 and 45 fathoms. Five new species of Madrepora — a 
genus whose usual limit is 10 fathoms — were found living between 
20 and 27 fathoms. The author indicates but does not describe the 
species which he regards as new. 
Alcyonaria and Zoantharia from Port Phillip.§ — Dr. S. J. Hickson 
has a preliminary report on the Alcyonaria and Zoantharia collected by 
the Port Phillip Biological Survey Committee. The author has had 
great difficulty in working out the collection, as the same form seems to 
have frequently had different generic and specific names applied to it. 
He gives a list of twenty-nine specimens, of which Clavularia australiensis , 
C. ramosa , and C. Jlava are new species; of each of these a short 
diagnosis is given. 
Invagination of Tentacles in Rhizoxenia rosea and Asteroides 
calycularis.|| — In most Cornulariidae the tentacles contract when the 
polyp contracts, but they are not invaginated ; Prof. G. v. Koch has, 
however, noticed a true invagination of the tentacles in Bhizoxenia rosea. 
Invagination of the tentacles does not seem to have been noted among 
the Hexacoralla, but in Asteroides calycularis tentacles have been seen to 
be invaginated at their basal portion, and to be pushed in and out like 
the tube of a telescope. The matter is worthy of further investigation. 
* Proc. Roy. Soc. Victoria, ii. (1890) pp. 135-6. 
t Bull. Mus. Comp. Zool., xx. (1890) pp. 61-2 (4 pis.). 
X Ann. and Mag. Nat. Hist., vi. (1890) pp. 353-74 (3 maps), 443-58. 
§ Proc. Roy. Soc. Victoria, ii. (1890) pp. 136-40. 
|| Morphol. Jahrb., xvi. (1890) pp. 399-400. 
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