ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 39 



new organs — the cephalic kidneys of Edriophthalmata and a pericardial 

 organ in Amphipods. 



The list is as follows : — (1) the antennary kidney and the maxillary 

 kidney, both present in the larvae, both persisting in Nebalia, the first 

 persisting in most cases, the second in Isopods ; (2) the branchial 

 kidneys (in Nebalia, Amphipods, Isopods, and My sis) • (3) cephalic 

 kidneys in Amphipods and Isopods ; (4) the " cardiac cells," surround- 

 ing the heart in Amphipods ; and (5) the " liver " in all cases. 



Maturation-Phenomena in Oogenesis and Spermatogenesis of 

 Cyclops strenuus.* — P. Lerat describes the first maturation-division. 

 It falls into Flemming's category of heterotypical division, showing a 

 longitudinal division of the daughter-batonnets of the first figure in the 

 metaphasis of the same. If there is a " reduction " in Weismann's 

 sense, it occurs in the first kinesis after the manner described by Mont- 

 gomery. 



Absorption and Secretion in Terrestial Isopods.f — J. R. Murlin 

 has made a careful study of absorption and secretion in Porcellio scaler, 

 Oniscus asellus, and other terrestrial Isopods. The part of the intestine 

 concerned in absorption is a single-layered epithelium of very large cells, 

 multiplying by amitosis especially at the time of moulting. There is a 

 mid-dorsal typhlosole. The intestinal epithelium is syncytial, the 

 cytoplasm being continuous from one cell to another. The author 

 describes minutely the alveolar structure of the cytoplasm, the intra- 

 cellular fibres, the spherical nucleus with numerous large granules of 

 chromatin, and the changes of the luminal side of the cells at moulting. 



The changes after three weeks' starving are described, and the sub- 

 sequent results of feeding with various food-stuffs. An intracellular 

 ferment is probably concerned in the change of food from an albumose 

 stage to a later stage of the hydrolysis (peptone), or to a stage in the 

 inverse process toward albumen. 



The cells of the typhlosole absorb soluble foods, but the primary use 

 of the structure is to provide channels through which the secretion of 

 the hepatopancreas may flow, unobstructed by solid food, to the median 

 portion of the intestine. 



In the hepatopancreas there is but one kind of secreting cell, rich in 

 ■zymogen granules, and forming a secretion which acts on proteids, 

 carbohydrates, and fats. The ferment is set free by fragmentation, 

 dissolution, or evacuation. The history of fat-foods has been very 

 successfully followed. We have not been able to give more than a hint 

 of the numerous detailed results of this research. 



Genus Amphion.}: — E. Koeppel gives a full account of Amphion 

 armata sp.n., a pelagic form captured by Chun near the Canary 

 Islands. He brings forward evidence, e.g. the successive changes from 

 the zoaea onwards and the occurrence of ovaries, to show that Amphion is 

 a sexually mature animal and not a mere larva, like Phyllosoma, as has 

 been maintained. Specifically, the form described is marked by a spine 



* Anat. Anzeig., xxi. (1902) pp. 407-11 (4 figs.). 



t Proc. Acad. Nat. Sci. Philadelphia, 1902, pp. 284-359 (1 pi.). 



t Arch. Naturges., lxviii. (1902) pp. 262-99 (2 pis.). 



