ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 651 



New Filaria.* — !0. von Linsfcow describes Filaria cingula sp. u. 

 from the skin of the giant salamander of Japan, Cryptobranchus maximus. 

 Tlie specific title refers to the prominent anunli on the cuticle. 



Platyhelininth.es. 



Maturation and Fertilisation in Cerebratulus marginatus.f — 

 C. Kostanecki describes the processes of maturation and fertilisation in 

 this Nemertine. One of the outstanding results is the clear proof that 

 the centrosomes of the first cleavage-spindle originate in the spermato- 

 zoon. In a subsequent paper J the author discusses the remarkable and 

 suggestive anomalies in the formation of the polar bodies in this 

 species. 



Regeneration of Pharynx in Planaria maculata.§ — Henrietta 

 F. Thacher has sought to find out if there is any marked difference 

 between the formation of the pharynx in the new tissue of an anterior 

 j)iece and in the old tissue of a posterior piece. It appears that the 

 regeneration of the pharynx in the new and in the old tissue is much 

 the same, (1) as to the origin and migration of the cells, (2) as to the 

 formation of the two cavities (the chamber and the lumen of the 

 pharynx), and (3) as to the differentiation of the cells into the normal 

 tissues. 



They differ (a) in the length of time that elapses before the pharynx 

 thickening shows itself (about twelve hours more being required for its 

 appearance in the old tissue than in the new), (b) in the position of the 

 developing pharynx with regard to the central digestive cavity, and 

 (c) in the size of the pharyngeal chamber as shown by its early irregu- 

 larities in the posterior piece. The last two differences are probably 

 due to the disposition of the digestive branches in the two cases. 



New Species of Monostomum — L. Cohn describes Monostomum 

 oculobium sp. n., from the eye" of Vanellus melanogasler, an exceedingly 

 hyaline form, as 'transparent as a Medusa, showing its internal organs 

 through a thick cuticle. One of the peculiarities observed was the 

 frequent occurrence of a situs inversus of the gonads, and this lends 

 Cohn to a discussion of similar conditions elsewhere, e.g. in Hsemato- 

 loechus variegatus Rud. 



Incertae Sedis. 



Structure of Cheilostomata.lf — S. F. Harmer finds that a large 

 number of Cheilostomata- are provided with a " compensation "-sac, a 

 structure described by Jullien, which opens at the proximal border of 

 the operculum, or by a "median pore." Muscles usually run from the 

 lateral walls of the zooecium to the floor of the sac, dilate it by their 

 contraction, thereby helping to force out the polypide. The constant 

 change of water in the compensation-sac probably has a respiratory 



* Zool. Anzeig., xxv. (1902) pp. 634-5 (1 fig.). 



t Bull. Internat. Acad. Sci. Cracovie, 1902, pp. 270-7 (10 pis.). 



j Tom. eit., pp. 278-89. 



§ Amer. Nat, xxxvi. (1902) pp. 633-41 (8 figs.). 



|| Zool. Anzeig., xxv. (1902) pp. 712-8 (9 figs.). 



«f Quart. Journ. Micr. Sci , xlvi. (1902) pp. 263-350 (4 pis.). 



