ISOPODS OF NORTH AMERICA. 



281 



Fig. 292.— Sph.eroma quadkidentatum 

 (Aftek Harger). 



SPHiEROMA QUADRIDENTATUM Say. 



Sphvrinna quadridenUihim Sav, Jour. Acad. Nat. 8ci. Pnila., I, 1818, j). 400. — 

 Harger, Am. Jour. Sci. (3), V, 1873, p. 314. — Harcer with Verrill, Report 

 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, 1)1. IX, tig. 53. — Richard- 

 son, American Naturalist, XXXIV, 

 1900, p. 223; Proc. V. 8. Nat. Mus., 

 XXIII, 1901, p. 533. 



LocaJlfieK. — Now England; Vine- 

 yard Sound; Provincetown, Massa- 

 chusetts; Savin Rock, New Haven; 

 Cape Charles City, Virginia; St. 

 Catherine Ishmd, 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, H 

 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 antennw 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 

 antenna? 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 

 are su])equal and each is a little 

 longer than the third. The fia- 

 gellum is composed of fifteen 

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

 second thoracic segment. The maxillii)ed has a palp of five articles. 



FlC. 293.— SPH.EROMA QUADRIDENTATUM. a, MAN- 

 DIBLE. X 41. 6, Frontal LAMINA AND CLYPEus. 

 X 23. c, Maxilliped. X 41. 



