ISOPODS OF NOBTH AMERICA. 



281 



FIG. 292. SPH.EROMA QUADRIDENTATUM 

 (AFTER HARGER). 



SPH^EROMA QUADRIDENTATUM Say. 



Sphvroma quadridentatum SAY, Jour. Acad. Nat. Sci. Phila., I, 1818, p. 4CX). 

 HARGER, Am. Jour. Sci. (3), V, 1873, p. 314. HARGER with VERRILL, Eeport 

 U. S. Commissioner of Fish and Fisheries, 1873, Pt. 1, p. 315 (21); p. 

 569 (275), pi. v, fig. 21. HARGER, 

 Proc. U. S. Nat. Mus., II, 1879, p. 

 161; Report U. S. Commissioner of 

 Fish and Fisheries, Pt. 6, 1880, pp. 

 368-370, pi. ix, fig. 53. RICHARD- 

 SON, American Naturalist, XXXIV, 

 1900, p. 223; Proc. TJ. S. Nat. Mus., 

 XXIII. 1901, p, 533. 



Localities. New England; Vine- 

 yard Sound; Provincetown, Massa- 

 chusetts; Savin Rock, New Haven; 

 Cape Charles City, Virginia; St. 

 Catherine Island, Georgia; Beau- 

 fort, North Carolina; east Florida; 

 Key West, Florida; south Florida. 

 Depth. Surface to one - half 

 fathom. 



The type locality is St. Catherine Island, Georgia. 

 Body ovate, nearly twice as long as wide, 5 mm. : 10 mm. 



Head twice as wide as long, 1 

 mm. : 3 mm. , with a frontal bor- 

 der arising between the eyes and 

 produced in a small median point. 

 The eyes are small, round, com- 

 posite, and situated in the post- 

 lateral angles of the head. The 

 first pair of antennae have the 

 basal article elongate; the second 

 article is half as long as the first; 

 the third is twice as long as the 

 second. The flagellum is com- 

 posed of twelve articles. The first 

 antennae extend to the middle of 

 the first thoracic segment. The 

 basal article of the second anten- 

 nae is inconspicuous; the second 

 is short; the third is twice as long 

 as the second; the fourth and fifth 



FIG. 293.-spH*ROMA QUADRIDENTATUM. a, MAN- * subequal and each is a little 

 DIBLE. x 41. 6, FRONTAL LAMINA AND CLYPEUS. longer than the third. The fla- 



x 23. c, MAXILLIPED. x 41. n j c 



gellum is composed of fifteen 



articles. The second antennae extend to the posterior margin of the 

 second thoracic segment. The maxilliped has a palp of five articles. 



