36 NEW-YORK FAUNA == CRUSTACEA, 
ORCHESTIA GRYLLUS. 
PLATE VII. FIG. 19. 
(STATE COLLECTION.) 
Talitrus gryllus, Bosc, Hist. Nat. des Crustacés, Vol. 2, p. 152, pl. 15, fig. 2. 
T. (Orchestia) id. Say, Journ. Acad. Nat. Sciences, Vol. 1, p, 386. 
Orchestia id. GovuLp, Invertebrata of Mass, p. 334. 
Description. Lower antenne 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 
antenne longer than the preceding two united. Upper antenne scarcely longer, or not as 
long as the peduncle of the lower antenne. 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 antenne shorter than the 
body, and only reaching as far back as the fourth segment, slightly hairy and somewhat rugose 
on the third joint. Upper antenne 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 sete. 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. 
