89 



or marginal ones. Anterior feet very hairy on the 

 edges ; carpus with two or three sharp spines at the 

 inner angle ; fingers both toothed near their inner 

 bases ; the lower or immovable one rather slender 

 and curved. Terminal segment of abdomen large, 

 transverse, and projecting a little beyond the margin 

 of the lateral plates. Length lj inches. From the 

 coast near Monterey. G. Pugettensis differs from 

 this species in that its carapax is covered with pu- 

 besence anteriorly as far as the transverse dorsal 

 suture ; and in wanting teeth on the fingers. 



Crangon Franciscorom, St. More slender and 

 less depressed than is usual in the genus. Rostrum 

 small, subtriangular, rounded in front. Spines of 

 thorax nearly as in C. vulgaris. Palm of hand very 

 oblique, inclining to loogitudinal, occupying nearly 

 one-third of the length of its inner side ; the thumb- 

 like process long and spiniform. Sternal spine long, 

 and followed by two or three sharp tubercles on the 

 succeeding segments. A small sharp spine on each 

 side of the abdomen at the supero-lateral angle of 

 the antepenultimate segment. Terminal segment 

 very long, slender, and pointed, smoothly rounded 

 above. Color light and dark yellowish-gray, mot- 

 tled. Eyes salmon colored in life. Length three 

 inches. This is the common market shrimp of San 

 Francisco, and is found abundantly in the sandy 

 coves around the bay. 



Crangon nigricauda, St. This species resembles 

 very closely the common shrimp of Europe and of 

 the Northern United States, and is probably the spe- 

 cies mentioned by Owen as occurring at Monterey, 

 which he considers identical with C. vulgaris, (vid. 

 Zool. of Biechey's Voy., p. 87.) It may, however, 

 be distinguished from that species by its smaller and 

 comparatively shorter hand, and by the narrower 

 and more pointed terminal abdominal segment which 

 has also a shallow longitudinal furrow on the upper 

 surface. The flagella of the internal antenna? are 

 unequal in length, the longest but little surpassing 

 the extremities of the lamella? of the external anten- 

 nae. Rostrum very small, nearly oblong, with its 

 extremity rounded. Sternal spine single, directed 

 obliquely forward. Color blackish above, darkest 

 at the tail. Hands of a lilac tint. Length 2h inch- 

 es. Found in deeper water than the preceding spe- 

 cies, from which this is easily distinguished by its 

 shorter, broader, and more depressed form, and by 

 its darker color. 



Hippolyte palpator, Owen. (/. c, PI. xxviii. f. 

 3.) Color pale yellowish, with transverse streaks 

 of crimson at the articulations of the segments and 

 on the legs. It is not uncommon ou the sandy bot- 

 tom of the bay in from five to ten fathoms. 



Htppolytb Brkyirostris. Dana. (I. c, Tau., 1852, 

 p. 24.) Of a uniform pale lake- color. A larger 

 species than the preceding. Taken in the Bay of 

 San Francisco. 



Idot.ea coxsouoata, St. Body convex, broadest 

 at the fourth thoracic segment ; first four segments 

 of thorax larger in every dimension than the last 

 three, convex, and with an umbo near the lateral 

 margins, which arc turned up a little. No distinct 

 epimera. Abdomen convex, formed of a single piece, 

 with a slight transverse depressed line indicating the 

 partial separation of an anterior segment ; narrowed 

 toward the posterior extremity, which is terminated 

 by a little concavity. Eyes strongly convex. Exte- 

 rior antennae half as long as the body ; flagella with 

 nine elongated articles. Internal antenna? superior, 

 without flagella, and reaching to the fourth article of 

 the external ones. Feet with long termioal articles 



or fingers. Color reddish or brownish, mottled. — 

 Length, 0.4 inch; breadth, 0.18 in. Taken in ten 

 fathoms sand, near the entrance of the Bay of San 

 Francisco. 



Philoscia tcberculata, St. Body somewhat loose- 

 ly articulated anteriorly, covered above with gran- 

 ulations, or more properly minute tubercles, which 

 are somewhat variable in size, but generally as large 

 anteriorly as posteriorly, and show a tendency to 

 arrangement in transverse rows ; two or three to 

 each segment. Antennae inserted in the cavities be- 

 tween the middle and the side lobes of the head, 

 which are very prominent ; they are composed of 

 seven articles, the last two forming the fiagellum. — 

 Caudal segment small, narrow, with a rounded ob- 

 tuse point. Terminal article of external ramus of 

 caudal appendage styliform, tapering to an obtuse 

 point, and reaching beyond the extremity of the ab- 

 domen to a distance equalling half its length. Color 

 dark gray, almost black ; below greenish white. — 

 Length 0.33 inch. Found under dead leaves, sticks, 

 etc., in damp places, and along the margins of brooks. 



Caprella Californica, St. Antenna? exceeding- 

 ly variable in their proportions ; flagella of superior 

 ones 10 — 15-articulate ; inferior ones sub-pediform. 

 A more or less developed spine, which curves for- 

 ward, and is sometimes of considerable length, is 

 placed upon the back at the anterior extremity of 

 the first thoracic segment. Hand of second pair of 

 feet generally three-toothed, teeth (in full-grown 

 specimens) about equal in size, and placed mostly to- 

 ward the outer extremity of the hand. Two or three 

 sharp tubercles along the sides of the branchiferous 

 segment ; and a short dorsal spine on each of the 

 posterior segments. Hands of posterior feet slender. 

 Color variable. Length one inch. Found on sea- 

 weeds, etc., below low water mark in San Francisco 

 Bay. 



Corophium spinicorne, St. Inferior antenna? half 

 as long as the body, without flagella, and with a 

 large, curved, sharp-pointed spine at the inferior ex- 

 tremity of the very thick third article. Superior 

 antenna? nearly as long as the inferior ones. Feet 

 with plumose hairs ; those of the first pair with mi- 

 nute subcheliform hands, palm transverse, third and 

 fourth articles with long seta? along the inferior 

 edge. Feet of the second pair simple, but with the 

 third and fourth articles conjoined laterally, as if 

 forming a hand ; the fourth article being placed in- 

 feriorly and fringed with long hairs. Caudal stylets 

 as in C. longicome, except that the external ramus 

 in the second pair is not cultriform. Color brown- 

 ish, darkest at the head, with transverse bands of 

 light yellow corresponding to the articulations. — 

 Antenna? brownish. Length 0.4 inch. Found among 

 conferva?, etc., in the salt marshes on the shores of 

 San Francisco Bay. 



Ebiohthonius rapax, St. Small epimera on the 

 first thoracic segment, larger ones on the second, 

 both narrow, not touching each other. Antenna- 

 subequal, one-third as long as the body ; superior 

 ones with (i-articulate flagella ; inferior ones strong- 

 ly toothed at the inferior angle of their basal seg- 

 ment, and with 10-articulate flagella. Mandibular 

 palpi reaching beyond the middle of basal article of 

 the superior antenme. Eyes on lobes which protrude 

 forward between the bases of the antenna-. Hands 

 of the first pai» small, subcheliform ; those of the sec- 

 ond pair of great size, with a bi-articulato finger, and 

 a thumb one-third as long as the finger, with a strong 

 tooth at the middle of its inner side. Color brown- 



