388 
ZOOLOGY. 
Order DECAPOD A MACROURA, —Long-tailed Crustaceans. 
CALLIANASSA CALIFORNIENSIS, Dana. 
Small Land Crawfish. 
Callianassa Califomiensis, Dana, Proc. Acad. Nat. Sc. Phil., 1854, VII, p. 175. 
Callianassa occidentalis, St. Proc. Cal. Acad. Nat. Sc. I, 1855, 88. 
Sp. Ch. —Eye peduncles sub-triangular, closely approximated at their bases, but diverging at their pointed tips. Length 
of external antennae two-thirds that of the body. Larger anterior foot smooth and glossy on the sides, ciliate along the 
edges. Hand broadest at the base, but little longer than the carpus and much narrower. Color a delicate orange ; anterior 
feet rose-colored. Length, three inches. 
This animal lives in the hard sand about the mouth of Shoalwater bay, buried at the depth 
of about a foot, and leaving a small hole at the surface, sometimes visible at low tide. It may 
readily be known by its soft body and general form, resembling that of the crawfish. Two 
other species, one of them often five inches long, are found in similar situatious on the coast. 
ASTACUS TROWBRIDGII, St imp son. 
Coast Crawfish. 
Astacus trowbridgii, St. Proc. Bost. Soc. Nat. Hist. VI, p. 87.— Ibid. Joum. Bost. Soc. Nat. Hist. VI, (ex¬ 
tracted, p. 83,) pi. xxi, fig. 4. 
Sp. Cii. —Thoracic spines prominent, rostrum short, broad, with smooth nearly parallel sides; terminal tooth of moderate 
length ; antero-lateral teeth sufficiently prominent. Hands large, robust, equal in size; surface rough ; fingers spinulose. 
A prominent spine near the extremity of the brachium. Color, when fresh, olive above ; pale, tinted with red below. Length, 
four to five inches. 
Numerous species of crawfish are found in the Territory, nearly all so closely allied as to be 
distinguished only on careful comparison. One found in the Columbia is said to grow eight 
inches long. 
This species is found in the streams running into Shoalwater bay, and also at the mouth of 
the Columbia. It sometimes gets into the brackish water of the bay, but probably returns to 
the fresh streams as soon as possible. All the crawfish are good eating, but small usually, and 
not much sought after. 
CRANGON FRANCISCORUM, Stimpson. 
San Francisco Shrimp. 
Crangon franciscorum, St. Proc. Cal. Acad. Nat. Sc. I, 1856, p. 89. — Ibid. Joum. Bost. Soc. Nat. Hist. VI, 
(extracted, p. 55,) plate xxii, fig. 5, (hand.) 
Sp. Ch. —Very slender and depressed ; rostrum small, subtriangular, rounded in front; hand large, with an oblique palm, 
tliumb-like process long and spiniform. Color, light and dark yellowish gray, mottled ; eyes salmon red in life. Length, 
from one to three inches. 
This is the only species of shrimp I found at Shoalwater bay, where it is very rare, since I 
got only three or four, and these only half the size it grows to further south. In San Francisco 
great numbers of this and a black-tailed species (C. nigriccmda, St.) are sold as food in the 
markets. Those I found were caught in September. 
