54 PROCEEDINGS OF THE CALIFORNIA 



dibles wanting the palpiform appendage. It is removed from Gammarus 

 proper by having no fasciculi of spines on dorsal surface, no appendage to 

 the antenna?, and a single telson. This is a very common Amphipod in nearly 

 all our lakes and small streams, and it is somewhat remarkable that it has 

 until now escaped detection. It occurs in great numbers in Lobos Creek, 

 where our specimens were obtained; also in the streams of Alameda County, 

 and I doubt not, may be found in any of the permanent fresh water ponds or 

 streams along our Coast for a considerable distance north and south of here. 

 It is with pleasure that I dedicate this genus to Mr. W. N. Lockington, 

 whose ability and industry has accomplished so much towards an orderly 

 arrangement of the Crustacea in our Museum, thus giving us an invaluable 

 cabinet of reference for those who desire to pursue investigations in this 

 interesting department of zoology. 



Lockingtonia fluvialis . n. s. 



Superior and inferior antennas setose. Superior a little more than half the 

 length of the inferior antenna?, and much longer than their base. Terminal 

 joint of inferior antenna? longer than the preceding; flagella twelve jointed. 

 Flagella of superior antenna? ten jointed. Caudal stylets and legs setose; the 

 latter especially so at the joints. Hand oblong-ovate, palm setose, oblique. 

 Carpus produced posteriorly along the proximal side of the manus. 



Hand of first pair of gnathopoda chelate. 



Length, ■£$ inch. 



Allonisms maculosus. n. s. 



Cephalon slightly transverse, rounded in front. Outer joint of inner 

 antennas sub-clavate, with four spines on its summit. Outer antennas spinulose 

 at the joints. Flagellum multiarticulate, setose at joints. Last joint of outer 

 antennas about one-third longer than the preceding. First segment of the 

 pereion longer than the 2d, 3d, 4th or 5th. The 6th and 7th shortest. The 

 lateral margins of the first two segments of the pleon concealed under the 

 seventh of the pereion. Color light brown above, with yellowish brown spots, 

 becoming darker in alcohol. 



Length, /„- inch. 



This is doubtless identical with some specimens of this genus which Prof. 

 Dana had before him while describing his Alloniscus perconvexus, and which 

 he says may probably be another species, Proc. Phil. Acad. 1854, p. 176. It 

 is very near A. perconvexus, but maybe readily distinguished from it by its 

 light brown color above, with yellowish spots, and its still lighter colored 

 limbs, which are minutely spotted with reddish brown, and its more slender 

 form. 



We found our specimens on Angel Island among fern roots, Woodwardia 

 radicans, early in March last. A few only obtained. 



Asellus Tomalensis. n.s. 



Head a little transverse, narrower than the body. Upper antenna not 

 reaching to the extremity of the peduncle of the lower. Flagellum of lower 



