ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 187 



New Echiuroid.* — I. Ikeda describes Hamingia ijimai sp. n. from a 

 500-fathorn basin in the Sagami Bay. The females differ from those of 

 H. arctica in the structure of the anal glands, the number of the main 

 canals (three on each side), the arrangement of the funnels, and so on. 

 The males are characterised by the absence of ventral hooks, the de- 

 generate intestine, and the extremely long sperm-reservoir. 



Nernatohelminthes. 



Excretory System of Echinorhynchus gigas.f — A. Schepotieff 

 describes two " protonephridia " — hollow lobed vesicles — lying one on 

 each side of the anterior part of the uterus. They consist of four 

 parts : a stalk, a few (15) main branches, very numerous (400) branches 

 of the second and third order, and terminal expansions which do not 

 open into the body-cavity. The terminal parts are ciliated, an exception 

 to the statement that Nematohelminths have no cilia. Schepotieff com- 

 pares the excretory organs of Echinorhynchus gig as with those of 

 Priapulids : there is a resemblance in form, position, and relations to the 

 genital organs. 



Sexual Phenomena in Free-living Nematodes.]: — F. A. Potts has 

 corroborated some of Maupas' observations on Rhabditis and Diplogaster. 

 In the case of an hermaphrodite species of Diplogaster, there are supple- 

 mental males, structurally perfect, with abundant spermatozoa, which 

 seem to have lost their sexual instinct. These useless forms occur in 

 small but fluctuating numbers. Artificial conditions made no difference 

 on the number. The species under observation multiplied by self- 

 fertilisation for a year, but exhibited no signs of degeneration at the end 

 of that period. 



Classification of Strongylidae.§ — A. Railliet and A. Henry discuss 

 this difficult problem. The sub-family Metastrongylinse is defined off 

 from Ankylostominae. The Metastrongyhnge include the following : 

 Metastroiig ylus, Dictyocaulus, Synthetocaulus, Grenosoma, Hsemostrongylus, 

 Haemonchus, Graphidium g. n., Tricho strong ylus, Gooperia, Ostertagia, 

 Nematodirus, Histiostrongylus, Heligmosomum, g. n. Definitions of the 

 new genera are given. 



Platyhelminth.es. 



Regeneration in Planarian.|| — P. Steinmann made a median longi- 

 tudinal cut into the anterior end of a decapitated Planarian, and two 

 heads were formed. When the same was done posteriorly, two tails were 

 formed. When the anterior incision was shallow, the two heads were 

 small, each being about the size of half a normal head. When the longi- 

 tudinal cut was carried far back, the new heads were of the usual size. 

 The regeneration is influenced by the inter-relations of parts. 



* Annot. Zool. Japon, vii. (1908) pp. 61-8 (1 pi.). 



t Zool. Jahrb., xxvi. (1908) pp. 293-304 (1 pi. and 2 figs.). 



% Proc. Cambridge Phil. Soc, xiv. (1908) pp. 373-5. 



§ C.R. Soc. Biol. Paris, lxvi. (1908) pp. 85-8. 



|| Arch. Sci. Phys. Nat. xxvi. (1908) pp. 552-3. 



O 2 



