ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 585 



Platyhelminthes. 



Wound-healing in Flat Worms.* — N. Th. Meier has used a 

 modification of Locke's fluid as a medium in which to test the regenera- 

 tive capacity of flat worms. He experimented with Distomum tereti- 

 colle and Trmnophorus nodidosus, and found that though there was 

 no regeneration in the strict sense there was a very perfect heaUng of 

 wounds. 



New Fresh-water Nemertine and its Development.f — Iwaji Ikeda 

 describes Stichostemma grandis sp. n. from Japan (Hiroshima). The 

 proboscis nerves are nine in some forms, ten in others ; there are 

 about eighty hermaphrodite gonads on each side, and both kinds of 

 elements ripen simultaneously ; the cephalic glands do not extend 

 posteriorly beyond the level of the second pair of eyes ; the rhyncho- 

 coelom is relatively short. The worms live in soft mud within a mucus 

 secretion ; they are negatively heliotropic, and they spawn at night. 

 A large one may lay 400-500 eggs. Death soon follows spawning. 

 The segmentation process is of a very regular spiral type, and shows 

 in its earlier phases no directive cleavage determining the axes of the 

 embryo and the origin of the mesoderm. The two mesodermal bands 

 are produced by two large cells, which lie symmetrically one on each 

 side of the gastral invagination near its posterior lip. 



Incertse Sedis. 



Structure of Balanoglossus.J — 0. Maser deals with the structure 

 of B. car?iosus, B. davigerus, Glossohalanus sarniensis, G. miindus, and 

 gives a full account of a new species, Balanoglossus niimeensis. The 

 new form agrees closely with B. carnosus, and differs from the other 

 species of which a review is made. 



Rotifera. 



Polymorphism of Anuraea aculeata Ehrbg.§ — H. Kriitzschmar 

 concludes that there are small and large forms of this species which 

 differ in their proportions, in their resting eggs, and in their suscepti- 

 bility to environmental influence. He proposes to distinguish the 

 large variable form as a special sub-species, A. aculeata variabdis, as 

 distinct from the small and very constant type, for which the title 

 A. aculeata Ehrbg. is reserved. 



Echinoderma. 



Autotomy and Regeneration in Linckia.]] — H.L.Clark has studied 

 these processes in LincJcia guddingii, a common starfish of Jamaica. 

 Autotomy occurs at irregular intervals for a long period, if not through- 



* Zool. Anzeig., xlii. (1913) pp. 481-7 (7 figs.). 



t Annot. Zool. Japon., viii. (1913) pp. 239-56 (1 pi.). 



I Zool. Jahrb., xxxiii. (1913) pp. 361-430 (5 pis.). 

 § Internat. Rev. Hydrobiol., vi. (1913) pp. 44-9. 



II Zool. Anzeig., xlii. (1913) pp. 156-9. 



