ZOOLOGY. 307 



In a late memoir on the fauna of water deprived of light, 

 M. Ph. de Rougemont, in his studies on the crustaceans Garn- 



marus puteanus and Asellus Sieboldii, also the snail Hydro- 

 bins, brings out the fact of the excessive development of the 

 organs of smell in these animals, in which the eye is either 

 absent or very rudimentary. 



The external anatomy of a shelled phyllopod (Estheria cal- 

 if ornica Pack.) forms the subject of an essay by Dr. H. Lenz. 

 A number of new North American phyllopod crustaceans are 

 described by Packard in Hayden's Bulletin of the United 

 States Geological Survey (Vol. III., No. 1). It appears that 

 the genus Lepidurus is better represented in Western and 

 Arctic North America than in any other part of the world 

 so far as known, there being two Western American and one 

 Arctic American species. No species ofApus or Lepidurus 

 occurs east of the Mississippi valley, and all these phyllo- 

 pods occur mostly in the Western States. Several new en- 

 tomostracous crustaceans from Colorado are described by 

 Mr. V. T. Chambers in the same Bulletin. 



The crustacean fauna of Lake Titicaca itself is very 

 meagre. Except a species of Cypris, all the specimens col- 

 lected belong to one amphipodous genus, Alloi'chestes, which 

 had hitherto afforded but one or two authentic fresh-water 

 species, ranging from Maine to Oregon and the Strait of 

 Magellan. Seven new species are described in this paper 

 from Lake Titicaca. Several are remarkable for their abnor- 

 mally developed epimeral and tergal spines. Some are also 

 noteworthy as comparatively deep-water forms of a family 

 commonly regarded as pre-eminently littoral. Some of the 

 species occurred as far down as 68 fathoms, the greatest 

 depth of the lake being 154 fathoms. The marine species 

 usually inhabit the shore above low -water mark, and the 

 previously described fresh -water species are found in the 

 shallow water of brooks, pools, or edges of lakes. No strict- 

 ly fresh-water Orchestidte, the family to which these Crusta- 

 cea belong, have been reported from the Eastern continent, 

 although a few terrestrial forms are described, says Mr. 

 Faxon, as inhabiting moist soil away from the sea. 



The fresh-water Crustacea of Illinois have been enumerated 

 and new forms described by Mr. S. A. Forbes in the Bulletin 

 of the Illinois Museum of Natural History, No. 1. A num- 



