ie 
6 Geographical Distribution of Crustacea. 
course to the Indian village was unmarked by any incident wor- 
thy of note. The next day about 12, having taken a supply of 
musk-melons as our only food, we started for Vallecitas. ‘The 
afternoon was windy, and, a rare phenomenon in this region, 
one of them found a crater-like hollow, in which grow some very 
large canes. Shortly afterwards the strata of fresh water deposit 
thodon (G. Lecontei Conrad). About 4 p. m., we skirted along 
the northern edge of a long curved range of hills, the base of 
which was composed of strata of limestone dipping outwardly, 
and containing also Gnathodon ; around these hills and mounds 
were concentric lines of small stones from the mountains arranged 
by aqueous action 
About half past five, we encamped in the bed of Cariso creek, 
cy ibd dry; the night was stormy, but a melon apiece, and 
of a large mesquite fire soon made us contented. 
Leisiok at four the next morning, we reached Vallecitas in the 
afternoon, without farther adventure, worthy of being here nar- 
rated. 
Nore.—By the kindness of Capt. Davidson, I learn that while 
he was stationed at Fort Yuma, in Dec., 1853, a violent earth- 
quake occurred ; the ground in the vicinity of the Fort opened, 
forming fissures, rom which were thrown mud, sand and water: 
portions of the mountains several miles distant were seen to fall, 
and about forty miles S. E. of the Fort, in the direction of some 
springs, said to be similar to those herein described, was seen an 
immense column of steam. It is to be hoped that some of the 
officers then at the post will favor science with an account of the 
phenomena observed. 
mes D. Dan 
(Continued from vol. xviii, p. 326.) 
V. TETRADECAPODA. 
eee stating the conclusions from the tables* of the Tetra- 
decapoda, it should be observed that this division of Crustacea 
had bee leas thoroughly explored than that of the Podophthal- 
future ee must vary much the proportions 
f of the different regions. The coasts of Eu- 
within the reach of European z0- 
Arr. Il.—On the Geographical ae asta of Crustacea ; 
by Jam 
Pee | 
