ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 557 



Early Development of Mesoblast in Thalassema.*— J. C. Torrey 

 notes that the mesoblast in Thalassema mellita has a twofold origin, as 

 entomesoblast — derived from the posterior member of the fourth quartet, 

 and as ectomesablast — derived from all of the first three quartets of ecto- 

 meres, instead of from one alone as has hitherto been described to be the 

 case. A considerable number of these cells, however, are rudimentary, 

 and quickly disappear. It is, however, very difficult to make the lineage 

 at all clear without the author's figures. 



Nematohelminth.es. 



Fermentation of Glycogen in Ascaris.f — E. Weinland notes that 

 Ascarids kept without food or oxygen for 5-7 days in 1 p.c. salt solution 

 at the temperature of their host, show a marked diminution in their rich 

 store of glycogen. This is not due to a combustion, but to a fermen- 

 tation, resulting in carbonic acid gas and valerianic acid. 



New Nematodes.^ — 0- von Linstow describes two new parasites from 

 the iguana, Metopoceros cornutus, the one a species of Atractis (A. cruciata 

 sp. n.), the other Oxyuris monhyitera sp. n. 



Platyhe lminth.es. 



Fertilisation in Cestodes. § — 0. Fuhrmann discusses the various 

 modes of fecundation in Cestodes. In Dioicocestus Fuhrmann, where the 

 sexes are separate, there is ordinary copulation. In tapeworms with 

 well-developed penis, which occur in numbers together, e.g. Taenia inflata 

 and T. cirrhosa, there is cross-fertilisation, or at least fertilisation between 

 different proglottides of one strobila. Where the cirrus is relatively ill- 

 developed or very short, as in Davainea and Acoleinae, auto-copulation 

 occurs, though cross-fertilisation is still possible. In Aporina g. n. 

 (Aporina alba from Pyrrhua) cross-fertilisation is quite impossible, for 

 the vagina and the cirrus do not open to the exterior, but are connected 

 in the internal parenchyma. 



New Species of Caryophyllaeus || — G. Schneider found in 29 speci- 

 mens of Leuciscus crythrophthalmus three cases of abundant infestation 

 with Caryophyllaeus fennicus sp. n., a new example of an interesting genus. 

 Somewhat notable is its firmness of fixation in spite of a very simple 

 attaching apparatus, apparently a mere depression of the anterior end. 

 But this anterior end bears fine stiff "Hiirchen," is very mobile, and 

 strongly innervated. The new parasite is intermediate between C. muta- 

 bilis and C. tuba ; it has no proper cirrus, but a large pyriform seminal 

 vesicle. Like C. mutabilis, it probably has some limicolous Oligochset 

 as its intermediate host. 



Schneider also describes Bothrimonus nylandicus sp. n. from the 

 flounder (Pleuronectes flesus). In its contracted state especially, this 

 Cestode has a very marked resemblance to Diplocotyle, and this genus 



' Anat. Anzeig., xxi. (1902) pp. 247-56 (3 figs.). 



t Zeitschr. Biol., xlii. (1901) pp. 55-90. See Zool. Centralbl., ix. (1902) pp. 451-2. 

 t Centralbl. Bakt., 1" Abt., xxxi. (1902) pp. 2S-32 (1 pi.). 

 § CR. Soe. Neucliatel Sci. Nat. in Arch. Sci. Nat., xiii. (1902) pp. 516-7. 

 || Arch. Naturges., lxviii. pp. 05-78 (1 pi. and 3 rigs.). See Centralbl. Bakt., 

 1" Abt., xxxi. (1902) pp. 720-1. 



October loth, 1902 2 p 



