REPORT ON THE AMPHIPODA. 207 



Of Orcliestia gryllus, Busc, pi. vii. lig. 19, he says : — "Lower anteDDK much shorter Uiaii the 

 body, slightly hairy, but not rugose upon the third peduncular joint ; last article with about 

 twenty-five articulations. Anterior pair of feet with a prominent obtuse tubercle on the 

 antepenultimate joint ; penultimate joint dilated into an obtuse tubercle at the inner tip to 

 receive the thumb. Palm convex so as to receive the thumb without an interval, as long 

 as the lower edge of the hand. Length, 05-0"6. Habit of the j)receding, and alnindant 

 along the sandy beaches above the influence of the tide." 



Of Talitrus quadrifidus, pi. ix. fig. 27, he gives the following description : — " Head com])ressed, 

 eyes obliquely oval. Lower anteunoe shorter than the body, and only reaching as far back 

 as the fourth segment, slightly hairy and somewhat rugose on the third joint. Upper 

 antennae very short, scarcely exceeding the second joint of the lower ones. Body com- 

 pressed. Tail with three appendices terminating in four spines, each furnished with a series 

 of rigid setae. All the feet armed with a slender acute claw. Color, dark brown ; eyes 

 blackish brown. Length, 0'3-0"5. This species also passes under the name of Bewh-flea, 

 and is frequently found concealed under stones and sea- weed." 



Of Gammarut! minus, Say, pi. ix. fig. 29, he says : — " Body incurved, subcompres.=ed. 

 Upper antennse longest, with the setae short, attaining the tip of the second articulation of 

 the terminal joint, which has about twelve articulations. Eyes reniform. Color. Body 

 whitish, with a few pale fulvous spots on the sides. In dried specimens, the color becomes 

 reddish, and the lateral spots, more particularly towards the tail, are bright red. Length, 

 0'15-0'3. This species is common in most of our fresh-water streams, and may often be 

 detected under stones and pieces of wood. It is extremely active, and is popularly known 

 under the name of Fresh-wafev Shrimp." 



As " extra-limital " species, he gives brief accounts of Gammarus mucronatus. Say ; Gammarus 

 fasciatus, Say ; Gammarus locusta, Montagu ; Gammarus aj^pendirulatus. Say ; Ampliithoe 

 serrata, Say, Ampldtlioe dentata, Say, Amphithoe punctata. Say. His account of Cerapus 

 is as follows : — " Genus Ceeapus, Say. Antennse very large and robust, nearly equal ; the 

 upper of four joints, the lower or lateral ones of five. Anterior pair of feet small, mono- 

 dactyle ; the second pair with a broad palm and a two-jointed thumb. Head distinct, 

 ending in a small rostrum. " C. tubularis. (Id. [Say, Journ. Acad. Nat. Sc], p. 49. 

 C. abditus, Tbmpleton, Tr. Ent. Soc. Lond. Vol. i, pi. 20, fig. 5. See PI. 10, fig. 43 of 

 this work.) Head with a mucronate carina before, hand and first joint of the thumb with 

 one or two obtuse teeth ; eyes oval, black. Color. Body above blackish, with ii'regular 

 paler spots ; antennae and feet white ; joints tipped with blackish ; two hind pair of feet 

 and tail white. Inhabiting a membranous tube open at both ends. Length, 0'25. Sea- 

 heach, E<j(j Harbor, New Jersey." This is followed by an account of Say's Lepida/iijlis 

 dytiscus,oi Say's Unciola irrorata, and of Hi/peria, Latreille, to which he assigns " Hyperia 

 latreilh. (Edw. An. Sc. Nat. Vol. 20, p. 388. Say, Lanceola pelagic a, Ac. Sc. Vol. 1, p. 318. 

 Gould? Ioc. cit. p. 335.) Anterior pair of feet shortest ; third, fourth, and seventh equal ; 

 fifth longer ; sixth longer than the thorax. This species is probably the same noticed by 



Dr. Gould under the name of //. galba, Mont., as occurring in the pouches of Medusa ■ , 



on the coast of Massachusetts. Mr. Say's specimen was obtained from the Gulf stream." 

 Lastly he describes Say's Podocerus cylindricus. Under Lremipoda he figures, plate vi. 

 fig. 14, and describes Gyamus ceti, which, he says, "is usually found attached to the bodies 

 of whales along our coast, and occasionally on tunnies and other large marine animals. It 

 varies much in form according to its degree of development, and this has given rise to 

 several nominal species, which have not yet been sufficiently examined." In the description 

 he speaks of the second and tliird pairs of feet as " replaced by slender appendices, at the 

 bases of which are the branchial vesicles." As "extra-limital," he notices Cyamus abbrevi- 

 utus, Say. In the genus CapreUa he describes Say's species, Caprella geometrica, and as 

 "extra-limital," notices the two species mentioned by Gould in 1841, and Caprella e(jaiUbra, 

 Say. 



