ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 385 



The sac connected with the ovary seems to be the body-cavity ; some 

 further remarks are made concerning the seminal pouch, but the author 

 notes that many points, both histological and physiological, still remain 

 obscure. The groups of large, sometimes very large, cells which are 

 found in the body of Argulus appear to belong to the category of fat- 

 bodies ; the author has recently discussed the structure of these giant 

 cells. 



The justice of Claus's criticisms on the author's earlier views as to 

 the segmentation of the body is acknowledged, and the characters of 

 some of the appendages are discussed in detail, and descriptions of larval 

 characters are given. 



It has been remarked by Claus that the males of Argulus are much 

 less numerous than the females. When, in July, Prof. Leydig noticed a 

 number in the basin at the Botanic Garden at Bonn, the number of males 

 was easily seen to be greater than that of the females. Later on, how- 

 ever, this proportion changed ; in the new swarms, about the middle of 

 August, the females, which were full of ripe eggs, were more numerous. 

 It would appear then that the males die off towards the beginning of 

 autumn. 



Formation and Number of Polar Globules in Cirripedes.* — Prof. M. 

 Nussbaum states that in Cirripedes, and particularly in PolUcipes, there 

 are two polar globules in the egg. One arises in the ovary, and the 

 other after fertilization. The first lies without, the other within the 

 vitelline envelope. 



Vermes, 

 o. Annelida. 



Morphology of Annelids. f — In the fourth of his memoirs on this 

 subject, Dr. E. Meyer treats of the Serpulaceae and the Hermellidse. 

 The first point dealt with is the development of the thoracic excretory 

 system ; the larval nephridia of these forms are most like those which 

 Hatschek described in a larva from Faro, but differs in that they have 

 apparently no direct contact with the secondary mesodermal bands ; both 

 are completely closed internally. The earliest rudiments of the definite 

 thoracic nephridia are next considered under several heads. In the 

 complete development of these organs it is important to notice that the 

 lumen of the duct has a quite independent external pore, and that its 

 communication with the secondary coelom is only effected by the ciliated 

 infundibulum. The two distal ends of the nephridial tubes fuse in the 

 middle line after the closure of the haemal longitudinal groove. 



The supports of the cephalic gills of the Serpulacese and the paleae 

 of the Hermellidse are next discussed ; this is followed by an account of 

 the lateral neck-lobes of the Serpulaceee and the neural parapodia of the 

 first somite of the Hermellidae. The neural neck-lobes, which are next 

 described, are stated to be formed by a fold of the ventral integument, 

 and they are independent of the lateral lobes. The succeeding chapter 

 deals with the thoracic membrane of the true Serpulid^ and the trunk- 

 cirri of the Hermellidse ; all the parapodial cirri of the latter are hollow 

 processes, and are, therefore, lined internally by the peritoneum. 



The haemal and neural chaetopodia form the subject of the sixth chapter ; 

 it appears to be characteristic of the larvae of the Serpulaceae that three 



* Zool. Anzeig., xii. (1889) p. 122. 



t MT. Zool. Stat. Neapel, viii. (1888) pp. 462-662 (3 pis.). 



