36 NEW-YORK FAUNA CRUSTACEA. 



Orchestia GRYLLUS. 



PLATE VII. FIG. 19. 



(STATE COLLECTION.) 



Talitrus gryllus, Bosc, Hist. Nat. des Crustaces, Vol. 2, p. 152, pi. 15, fig. 2. 

 T. (Orchestia) id. Say, Journ. Acad. Nat. Sciences, Vol. 1, p. 386. 

 Orchestia id. GonLD, Invertebrata of Mass. p. 334. 



Description. Lower antennae much shorter than 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, 0-5-0-6. 



Habit of the preceding, and abundant along the sandy beaches above the influence of the 

 tide. 



GENUS TALITRUS. Latreille. 



Body composed of thirteen segments, exclusive of the head. Third articulation of the lower 

 antennas longer than the preceding two united. Upper antennas scarcely longer, or not as 

 long as the peduncle of the lower antennas. No feet in the form of a claw ; the second 

 pair not larger than the first. 



Talitrus quadrifidus. 



PLATE IX. FIG. 27. 



(STATE COLLECTION.) 



Description. Head compressed ; eyes obliquely oval. Lower antennae shorter than the 

 body, and only reaching as far back as the fourth segment, slightly hairy and somewhat rugose 

 on the third joint. Upper antennas very short, scarcely exceeding the second joint of the 

 lower ones. Body compressed. 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 horn ; eyes blackish brown. 



Length, 0-3-0-5. 



This species also passes under the name of Beach-flea, and is frequently found concealed 

 under stones and seaweed. 



