44 NEW-YORK FAUNA — CRUSTACEA. 
This beautiful and active species is seen swimming with a rapid vibrating motion in clear 
salt water, in recesses among the rocks. It appears to be most abundant in August and Sep- 
tember. As far as we know at present of its geographical distribution, it is found from 
Boston harbor to Cape May, but it probably extends along our whole coast. 
(EXTRA-LIMITAL.) 
8. filiformis. (Say, l.c. p. 424.) Body very much elongated, linear; segments distant, emarginate 
each side. Eyes very prominent. Antenne robust; outer more than half the length of the body ; 
the last joint enlarged. Length, 0°4. Egg harbor. 
GENUS ANTHURA. Leach. 
Body oblong-linear, vermiform. ail furnished with foliaceous laminz on each side; penul- 
timate segment very short, the last much longer. Antenne short; the intermediate ones 
rather shortest. Anterior feet with a movable nail. 
ANTHURA GRACILIS. 
PLATE IX. FIG, 34, 
Ontscus gracilis, Montacu, Tr. Lin. Soc. Vol. 9, p. 366. 
Anthura vl, Leacu, Des. Consid. Crustacés, p, 291, pl. 46, fig. 13. 
A. id. Goutp, Invertebrata of Mass. p. 338, 
Description. Body elongated. Feet subequal; the second pair smallest; the first pair 
largest, robust, terminating in a small subcheliform hand. ‘Two pair of foliaceous elongated 
lamine on each side of the last caudal segment, which is subtruncate behind. 
Length, 0°25. 
(EXTRA-LIMITAL.) 
Genus Spueroma, Latreille. Body oblong, convex, with subimbricated transverse segments, and 
contractile into a sphere. Antenne four, small; the external slightly longest. Tail of two 
segments; the last with a fin on each side, formed of two scales. Marine, 
S. quadridentata. (Say, l.c. p. 400.) Body oval, punctured. Tail with its last sezment semioval; 
the internal lateral lamella acute, entire; the external one serrate on the outer edge with four teeth. 
Color, brownish ferruginous, often varied with white or rosaceous, Length, 0°45. Coast of 
Georgia and Florida. 
