446 Stimpson on the Crustacea and Echinodermata 
museum, obtained mostly through the researches of Lieut. 
Trowsriver, Drs. Sucktey and Newserry, and Mr. A. S. 
Tayvtor. These specimens, together with those found by’ 
myself while on the North Pacific Exploring Expedition, 
form a large addition to Mr. Samuels’s collection, and have 
enabled me to make more extended and satisfactory obser- 
vations upon these divisions of our Western Fauna. 
It will be seen that more than one hundred and thirty 
species of. the class Crustacea have been determined to 
exist in the region now under consideration, a number 
which seems quite large when we consider that so recently 
as in the year 1838 not a single species was known to 
science as forming part of its fauna.* But we cannot sup- 
pose even this number to be more than a fourth part of that 
which will be reached when a thorough search shall be insti- 
tuted. Many families which are undoubtedly represented 
here by one or more species, have not yet been noticed ; 
and that part of the coast which is included within the 
W. P. Gispons. On a new genus of Crabs. P— of the California 
Academy of Natural cionem. 1855, vol. i. pp. 48, 
T. Berr. Hore Careinologice, or Notices of Onéstaciis. E A monograph of the. 
ucosiade. "Transactions of the Linnzan Society of London, 1855, xxi. 
W. Stimpson. On some Californian Crustacea. Proceedings of the California 
Academy of Satan Sciences, 1856, vol. i. pp. 87-90 
ptions of new species of Crustacea pus the Western Shores of 
North America. Proceedings of the Boston Society of Natural History, 
1857, vol. vi. pp. 84-8 
For the Echinodermata :— 
Escuscuoutz. Zodlogischer Atlas. : 
F. Branpt. Prodromus descriptionis animalium ab H. Mertensio in orbis terrarum 
circumnavigatione observatorum. Fascic. I. Petropoli, MDCCCXXXV- ins 
J. E. Gray. On the class Hypostoma. Annals and Magazine of Natural 
VALENCIENNES. Voyage de la Venus ned 
W. O. AYRES. On Californian Di d Proceedings of the Cannero 
Academy of Natural Sciences, 1855, i. 68. 
* “ Nous ne savons rien sur les Crustacés de la cóte occidentale de P Amer- 
ique du Nord.” Mirxz-Epwanps, Hist. Nat. des Crust. iii. 564, (1840.) 
