ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 583 



Of 68 species collected by the ' Albatross,' 39 are new. There are no 

 Grorgonids in the collection, few Briareids, but a surprisingly rich 

 representation of Primnoidse. The author finds the mode of growth of 

 the genera Cornidaria and Telesto united in one specimen {Clavularia 

 spiculicola sp. n.), and he unites Telesto with Clavularia, a proceeding 

 which will require to be justified by more evidence than is here given. 

 He establishes a new Pennatulid genus, Calibelemnon, with large polyps, 

 usually in opposite pairs, " a link in a chain of intergradation between 

 Kophobelemnonidaj and Umbellulida?." Another new genus is Cyclo- 

 muricea, with a flabellate colony, with short, stout, columnar calyces, 

 their walls with spicules (warty spindles) in annuli. 



Alcyonarians of Tadjourah.* — Ch. Gravier gives an account of a 

 collection of Alcyonarians from the Gulf of Tadjourah, which shows a 

 certain mingling of Red Sea and Indian Ocean species. He describes 

 a number of new forms : — Sarcophytummycetoides sp. n., Dendronephthya 

 formosa sp. n., D. kiikenthali sp. n., Mesobelemnon yracile g. et sp. n., 

 Scytaliopsis d/iboutiensis g. etsp. n. Gravier's genus Mesobelemnon is 

 closely allied to Kophobelemnou and Sclerobehmnon (if these are really 

 separate), while Scytaliopsis, though very Virgularid-like, is regarded as 

 worthy of a separate family. There is much valuable detail as to the 

 structure and mode of life of the forms described, and the illustrations 

 are of a very hisrh order. 



'b' 



Eurhamphsea vexilligera.t — C N. Jonesen describes this rare and 

 imperfectly known Mediterranean Ctenophore. It may be regarded as 

 in some respects a transition form between Bolina and Eacharis. 



Regeneration in a Medusa. :f — C. R. Stockard has made a large 

 number of experiments on Cassiopea xamachana. The rate of regenera- 

 tion in both directions towards the periphery and towards the disk 

 centre varies according to the level of the cut. Small cross-cut strips, 

 as well as triangular and V-shaped pieces of the disk, show great 

 regulatory ability. Such pieces will invariably form circular bodies in 

 the most direct manner. Such small circular bodies pulsate and act 

 very much as an entire medusa disk would. 



The rate at which Cassiopea regenerates its oral arms varies directly 

 with the number of arms removed ; the more arms cut away the more 

 rapidly will each arm be replaced. 



None of the specimens were fed during the regeneration of arms, 

 and all decreased considerably in size. Those which had lost eight arms 

 decreased twice as much as did those from which only one arm had been 

 removed. It looks as if the regenerating tissue had the power to grow 

 at the expense and actually to the exhaustion of the original body 

 tissues. 



Migration of Thread-cells of Mcerisia.§ — C. L. Boulenger finds that 

 the nematocysts among the endoderm cells of the manubrium are in 



* Arch. Zool. Exper., viii. (1908) pp. 179-266 (7 pis.). 

 t Jen. Zeitschr. Naturw., xliii. (1908) pp. 685-91 (1 pi. and 2 figs.). 

 % Carnegie Inst. Washington Year-book, No. 7 (1908) pp. 130-1. 

 § Proc. Cambridge Phil. Soc, xv. (1909) p. 180. 



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