Zoology. 1279 
_ tropods by a gland in the same position, but a longitudinal fur- 
_ row is added in the Acephala. Every operculum is formed of 
the same layers, the one produced at the posterior part of the 
= columellar muscle, while the other is laid down upon this, thick- 
ening it upon the inferior side. Sometimes a third layer is 
_ are macrura and other brachyura. While with rare exceptions 
the gastric skeleton of the brachyura follows the tolerably 
— uniform type, that of the macrura presents wide variations. 
_ The schizopods and stomapods present the same calcifications as 
_ the decapods, but the lateral teeth, which are rudimentary in the 
Squillidæ, are well developed in the schizopods. The latter have 
as their special character the absence of pyloric ampullz, 
they may change in form, coalesce, or occasionally disappear, no 
iti Guided by the characters of 
these parts, M. Mocquard divides the Grapsoidea into two groups, 
one consisting of the Ocypodidæ, the other including Gelasimus, 
Fishes—Mr. Gilbert has been studying the fishes of White 
Indiana, and of Kansas, and finds a few new species. 
fatious Percomorph genera.—— Professor Gill has been adding 
ou knowledge of the osteology of fishes, “cl 
Anacanthini and of the Plectognathi. All the above articles ap- 
the proceedings of the U. S. National Museum. l 
