ZOOLOGY AND BOTANY, MICROSCOPY, ETC. : *» « » T> 



cortex with some main longitudinal solenia and smaller reticulated ones ; 

 polyps retractile within more or less developed calyces ; spicules spindle- 

 shaped. 



Australian Pennatulids.* — Hjalmar Broch describes Sarcophyllum 

 roseum sp. n. from Middleton Beach, Albany, and distinguishes it from 

 S. g ramie (Gray) Kolliker. He also describes Pteroeides hymmocaulon 

 Bleeker from Shark's Bay. Emphasis is laid on the fact that the spicules 

 of Pennatulids, which have been generally regarded as on the whole 

 uniform, show minute distinctive features. 



Regeneration in Corymorpha.f — H. B. Torrey shows that this 

 hydroid is extremely plastic in its regeneration, as also in its develop- 

 ment. The amount of plasticity exhibited depends upon the dif- 

 ferentiation of the regenerating piece, particularly upon its degree of 

 organization into a whole, or the degree to which the original inter- 

 relations of its parts have been disturbed by experimental conditions. He 

 discusses experiments bearing on the effect of old parts upon regenera- 

 tion ; the effect of the position of the wound on the development of 

 pre-existing root-like processes ; retrograde changes in small pieces ; re- 

 generation at oblique wounds ; and so on. 



Hydroids of Drobak.f — Hjalmar Broch gives an account of the 

 Hydroids of Drobak Fjord, with a clearly written introduction which 

 will be useful to collectors and students, and a well worked out diagnostic 

 key to the genera. 



Polypodium hydriforme.§ — A. Dershawin reports the discovery in 

 the Delta of the Volga of a free-living phase of the Hydroid Polypodium 

 hydriforme, which has hitherto been known as a parasite on the eggs of 

 the sturgeon. 



L 6 V 



New Plumularid Genus. ||— A. Billard describes Sibogella erecta g.et 

 sp. n., a new Plumularid collected by the ' Siboga.' The stems are 

 canaliculate and bear numerous branches, rarely in verticils, more fre- 

 quently arising irregularly all round. They are sometimes so thickly 

 crowded that an appearance of verticils is produced. The hydroclads 

 are borne by the branches and lie in different planes. The genus is 

 adjacent to Nemertesia (Antenmdaria), but the hydroclads in the latter 

 are borne by the stem directly. 



Porifera. 



Remarkable Pharetronid Sponge. f — R. Kirkpatrick describes 

 Murrayona phanoJepis g. etsp. n. from Christmas Island. It differs 

 greatly from any previously described Pharetronid sponge. There is a 

 firm main skeletal network entirely devoid of spicules. The surface of 

 the sponge is covered with a dermal armour of large calcareous scales. 

 The poral and sub-dermal spicules are triradiate. The poral area is 



* Fauna Siid-west Australiens, iii. lief. 2 (1910) pp. 111-21 (1 pi. and 9 figs.). 

 t Advance Print from Proc. 7th Internal Zool. Congress, 1907 (1910) pp 1-2 

 X Nyt. Mag. Naturvidensk., xlix. (1911) pp. 1-31 (2 pis.). 

 § Zool. Anzeig., xxxvi. (1910) pp. 408-10. 



| Arch. Zool. Exper., vi. (1911) Notes et Revue, No. 3, pp. cviii-cix. (1 fi°- ) 

 U Proc. Roy. Soc, Series B, lxxxiii. (1911) pp. 124-33 (2 pis.). 



June ^lst, 1911 2 b 



