1092 EXPERIMENT STATION RECORD. 



"broad. The head is provided with a row of ten hooks each from 18 

 to 23/i long. The segmentation begins close behind the head, having 

 scarcely any neck. The genital pores are unilateral. Eggs, spherical, 

 40 to 50 ju in diameter. 



In the length of the hooks the species resembles D. tenuirostris in 

 which they are 20 to 23 u long. In the embryo of I), hemignathi the hooks 

 are 20//, in the embryo D. tenuirostris only 7//. The species differ 

 further in the longer neck in the last-named form and in its larger egg. 



On the "leucocide" substances in the metabolic products of Staphylococcus 

 pyogenes aureus, O. Bail (Arch. Hyg., 32 (1S9S), No. 1-2, pp. 133-171). 



Researches on the influence of the organism on toxins, E. Metchxikoff ( Ann. 

 Inst. Pasteur, 11 {1897), No. 11, pp. 801-809). — The author concludes that plants such 

 as bacteria and fungi can destroy toxins and transform them into vaccines without 

 producing an antitoxin; that the invertebrates are capable of producing a tetanic 

 antitoxin in appreciable quantities; that the production of antitoxins begins in the 

 animal series with the crocodiles, where the power is more highly developed than in 

 the higher animals; that the antitoxic power is not to be considered as bound to any 

 febril reaction whatever; that the antitoxic property of the fowl is in the blood; 

 that it is not possible to accept the idea that natural immunity depends on the anti- 

 toxic power, and that the antitoxic property in the animal kingdom has an evolu- 

 tion less ancient than the phagocytic reaction. 



Helminthological contributions, A. MCi.i.eh (Arch. Naturgesch., 03 (1897). pp. 1-26, 

 pis. 3: ahs. in Zool. Gentbl., 3 (1S9S). X<>. 2. pp. 49).— A description is given of Spirop- 

 tera Iruncata Crpl., from Coriacias garrula, and of Filaria capitellata Sclin., which is 

 regarded as identical with Hystrichis papillosa Rud., from C. garrula. Dispharagus 

 anthuris of Rudolphi, Molin, and Dujardiu is to be separated from F. anthuris of 

 Schneider and von Linstow ; the name of the latter must be retained, while the 

 former species, which is found between the gastric membranes of Lanius collurio, 

 L. ruftis, and Coracias garrula,must be called Dispharagus cordatus. There are also 

 described : /•'. recta v. Linst, from Podiceps cristatus; F. involuta v. Linst, from .Fgolius 

 "Ins: !'. tricuspis f'edt. from Corvus corone; an unknown Ascaris from the (esophagus 

 and stomach of Felis tigris; Heterakis compar Schrank, from Tetrao urogallus and 

 T. tetrix; Ankylostomumtrigonocephalumllud., from Canisvulpes; Strongylua nodularis 

 Rud., from Fulica atra : S. retortazformis Rad., from Lepus; Crenosoma semiarmatum 

 Molin, from Canis vulpes; and Ancry acanthus bihamatus n. sp., from Sterna risoria. 



Fecundation in Ascaris megalocephala, J. B. Cakn<>y and H. Lebrun (Cellule, 

 Ti I, pp. 60-195, pis. .' : ahs. in Zool. Centbl., ■', \ 1898), ••'. pp. 79-S4). 



Contributions to the structure of protoplasm, the karyokinetic spindle, and 

 the centrosome. I, On the fertilization and first division of the egg of Ascaris, 

 R. vox Erlanger (Arch. Mikros. Anat., 49 (1897 . pp. 309-440, ph. 3; ahs. in Zool. 

 Centbl., 5 (1898), No. 3, pp. 14-\ . 



The genus Ascaris, M. Stossicu (// genre Ascaris Linnd. Trieste, 1896, pp. 11 i .— 

 A toxonomic description is given of 217 species. Tlieir synonymy seems to be fully 

 brought out, and hosts and localities are usually mentioned. In the systematic index 

 given the parasites are noted under the names of their hosts arranged in zoological 

 order. From this it appears that 77 species of mammals, 170 of birds, 37 of reptiles, 

 5 of amphibians, 142 of fishes, and 1 of insects are affected. 



The single insect host is Fterostichus niger, which harbors Ascaris pteroslichi. 



Bothriocephalus zschokkei, M. L.UHE (Zool. An:., SO, No. 544, pp. ahs. 



in Zool. Centbl., 5 (1897 . No. 2, p. 47).— Bothriocephalus zschokkei is thought synony- 

 mous with Schistocepihalus dimoiphus. 



A preliminary contribution on the anatomy of Taenia polymorpha, K. Woi.ff- 

 HUGEL (Zool. Am., 21, No. 554, pp. .//-.;;).— The testis, vas deferens, and cirrus 

 apparatus are paired; the female genital glands and the uterus simple; the vagina 



