ZOOLOGV AND BOTANY, MICROSCOPY, ETC. 573 



Fol., Stegosoma magnum Langhs. The commonest species are 0. 

 longicauda, 0. dioica, 0. fusiformis, which haYe been recorded from tin- 

 coast of Chili — showing a wide range of distribution. Some, snch as 

 KowalevsMa ten nix and Fritillaria haplostoma, occur along with swarms 

 of Noctiluca, and only then. 



Regeneration of Test in Tunicates.* — Alice Fol has found that 

 Ascidiella aspersa can sometimes re-grow its test. Experiments with 

 Phallusia etc. did not succeed. The reasons for failure are discussed. 

 Thus the test is needed as a basis for the muscular movements, and the 

 animal dies if the test be removed. There may be fatal loss of blood, or 

 the removal of a part of the tunic may induce a fatal hernia. The in- 

 vestigator does not explain why the removal of the test may be survived 

 in some specimens of Ascidiella. 



Musculature of Compound Tunicates.f — G. Daumezon finds in 

 species of Distoma transverse bundles in the mantle and longitudinal 

 bundles in the branchial region, in addition to the more primitive 

 arrangements which run longitudinally in the mantle and transversely 

 in the branchial region. 



Development of Distoma tridentatum4 — GL Daumezon compares 

 the development of this compound Ascidian with that of Distaplia 

 magnilarva as described by Davidoff. There are some notable differ- 

 ences which are probably due to the large quantity of yolk in Distoma. 

 The mesoderm and notochord of D. tridentatam cannot be formed in 

 the usual way — by folding of the wall of the enterou — for the enteric 

 cavity is not formed until after their appearance. 



Development of Notochord in Larval Ascidians.§ — Louis Roule 

 has studied the development of A.scidia mentula. He finds that after 

 gastrulation the enteric primordium gives rise posteriorly to three 

 enteroccelic diverticula, one median and two lateral. The latter form 

 the musculature. The former gives rise to the notochord on its dorsal 

 surface and sides, and ventrally to the endodermic cord (cordon endo- 

 dermique) — a row of cells which extends under the notochord the whole 

 length of the tail. At its end the notochord seems simply part of the 

 wall of a median caecum from the archenteron. 



IN VERTEBBATA. 



Mollusca. 



a. Cephalopoda. 



Female Gonads of Cuttle-fishes. || — Walter Doring describes these 

 in a number of species : Sepia elegans, S. officinalis, Loligo vulgaris, 

 L. marmora, Rossia macrosoma, and Sepiola rondeletii. He gives a 

 detailed account of the structure of the oviduct, the oviducal gland, 

 the nidimental glands, and the accessory nidimental glands, and he 



* Bull. Soc. Zool. France, xxxiii. (1908) pp. 79-81. 



t C.R. Soc. Biol. Paris, lxiv. 1908) pp. 774-5. 



t Tom. cit., pp. 776-7. 



§ Comptes Rendus, cxlvi. (1908) pp. 357-9. 



[j Zeitsehr. wiss. Zool., xci. (1908) pp. 112-S9 (59 figs.:. 



