ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 463 



Madreporaria from Mergui.* — Ruth M. Harrison and Margaret 

 Poole report on the Madrepores of a collection made by J. J. Simpson 

 and R. N. Rudmose-Brown in the Mergui Archipelago. The variable 

 species Heterocyathus sequicostatus and Flabellum rubrum have many 

 representatives in the collection. A new species, Balanophyllia diffusa, 

 is described, and there are notes on various species of Dendrophyllia, 

 Balanophyllia, and other genera. 



Californian Species of Cerianthus.f — H. B. Torrey and F. L. 

 Kleeberger describe three new species — Cerianthus sestuari, C. benedeni, 

 and G.johnsoni. On the mesenteries of the third and fourth cycles of 

 C. benedeni, the branched processes of the mesenterial filaments are loaded 

 with " cnidorhages," that is to say, with follicles packed with cnidoblasts, 

 which may be of several sorts, the largest and by far the most important 

 equalling in length the diameter of the follicle, and far surpassing all 

 the others in bulk. 



Notes on Medusae of Western Atlantic. $ — H. F. Perkins describes 

 Cladonema mayeri sp. n., in its Hydroid and Medusoid stages, and has 

 made a study of their behaviour and reactions (as observed in the moat 

 at Fort Jefferson). The Medusoid is sluggish in its movements, and this 

 may be associated with the fact that the tentacles are laden with con- 

 cretions. The polyp, growing singly, was so exceedingly delicate that it 

 was almost invisible to the unaided eye. The largest of over a dozen 

 was 1 " 5 mm. in height. 



Perkins also describes Campanularia macrotheca sp.n., Aglaura ciliata, 

 sp. n., and has notes on Cassiopea xamachana and Polyclonia frondosa at 

 the Tortugas. 



Entry of Zooxanthellse into Ovum of Millepora.§ — J. Mangan 

 shows that zooxanthellre pass from the parental tissues into the ovum. 

 He also communicates some notes on the structure of the liberated female 

 medusa and on the oogenesis. There is a migration of the nucleus to 

 the periphery, and a casting out of chromatin into the cytoplasm until 

 hardly any remains. 



Differentiation and Growth in Aglaophenia.|| — H. B. Torrey has 

 studied various species of Aglaophenia, at different ages, to test whether 

 the progressive changes observed are dependent on internal conditions, 

 and his result is to establish a correlation between differentiation and 

 growth. 



Two Unrecorded ' Challenger ' Hydroids.1" — James Ritchie found 

 two epizoic hydroids creeping on the type specimens of Campanularia 

 insignis Allman, namely, Lafoea venusta Allmann and Aglaophen ia rylin- 

 drata Versluys. He also points out that Campanularia insignis is the 

 same as Obelia marginata, and that the proper name for the species is 

 Lytoscyphus marginata. 



* Proc. Zool. Soc, 1909, pt. 4 (1910) pp. 897-912 (2 pis.). 

 t Univ. California Publications, vi. (1909) pp. 115-25 (4 figs.). 

 t Carnegie Inst. Washington, Publication 102 (1909) pp. 133-5G (4 pis.). 

 § Quart. Journ. Micr. Sci., liii. (1909) pp. G97-709 (1 pi.). 

 || Biol. Bull., xviii. (1910) pp. 138-54 (6 figs.). 

 ^ Zoologist (July 1909) 4 pp. 



