ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 179 



Annulata. 



Notes on Polychaets.* — W. C. M'Intosh describes GenetylUs citrina, 

 a new Phylloclocid, which approaches G. lutea Malmgren. The setigerous 

 region is supported by a black spine and carries shorter bristles with 

 shorter terminal processes than in G. lutea. 



The author also discusses in some detail the reproduction of Nereis 

 diversicolor, and finds that, so far as observed at St. Andrews, there is 

 no foundation for the statement that the Scotch representatives are 

 hermaphrodite, and still less that they are viviparous, as mentioned by 

 Max Schultze, by the " Cambridge Natural History," and by Gravier. 



Nervous System of Saccocirrus papillocercus.f — W. D. Lepeschkin 

 finds that each metamere has two pairs of ganglia, with a cross-shaped 

 commissure between each pair ; that each metamere has six pairs of 

 nerves, of which i. ii. and iv. are motor, while iii. v. and vi. are 

 sensory ; that the 6th nerve has associated with it a strongly refractive 

 body, probably a sense-organ ; that the lateral sense-organs in each 

 segment are well developed ; that there is a setose glandular sensory 

 region along the back ; and that the ventral cord includes colossal 

 nerve-fibres and giant ganglion -cells. The complexity of the nervous 

 system is against the view that Saccocirrus is a primitive type. 



Regeneration in Podarke obscura.J — Sergius Morguli notes that 

 when this Polychast regrows a posterior half, the regrown part is for 

 a time transparent and without chitinous cuticle. Gradually the old 

 tissue has its chitinous layer thinned off, and the new part becomes 

 chitinised. Finally, the old and new parts are covered by a continuous 

 layer of uniform thickness. The author finds in this " a case of trans- 

 mission of materials from all parts of the old tissue to provide for 

 the building up of the new tissue," but his facts are not convincing. 

 He concludes that it is the organism as a whole, and not the exposed cut 

 surface, that is concerned with the regeneration of the lost tissue. 



By interesting experiments in Lumbriculus, the author § has con- 

 vinced himself that little worms grown from parts which have a high 

 regenerative capacity have a similar capacity. The ratio between the 

 rates of posterior regeneration in the mother-pieces is very nearly like 

 that between the rates of regeneration in their regenerated offspring. 

 " The property of regeneration passes over to the new tissue, together 

 with the protoplasmic material it is built of." 



Respiration in Earthworms. || — M. Konopacki has made an elabo- 

 rate physiological study of the respiratory processes in various species 

 of Lumbrkus, in normal and in peculiar conditions. The intensity of 

 the respiration differs in different species ; it is directly proportional 

 to the temperature. Earthworms can live for 6 to 30 hours without 



* Ann. Nat. Hist., xx. (1907) pp. 175-85 (1 pi.). 



t MT. Ges. Freund. Naturw. Moskau, xcviii. (1907). Tagebucb Zool. Abtb... iii. 

 pp. 1-9 (2 pis.). See also Zool. Zentralbl., xiv. (1907) p. 435. 



%• Obio Nat., viii. (1907) pp. 217-19. § Tom. cit., pp. 219-21. 



|| Bull. Acad. Sci. Cracovie, No. 5 (1907) pp. 357-431 (15 figs.). 



