ISOPODS OF NORTH AMERICA. 2.37 



The first three pairs of h'^s are more or h'ss manitesth' shorter than 

 the others. Unofuhe subeciual. 



Male is imich sniaUer in size than female. 



ANALYTTCAI. KEY TO THE SPECIES OP THE GENUS METNERTIA. 



o. First pair of anteniuc short, extending to the eye or to the posterior margin of the 



head. Second pair of antenn;e short, extending to the posterior margin of the 



head, and composed of only eight or nine articles. Head more or less deeply 



set in first thoracic segment. 



b. High carina present on the basis of the last fom- i)airs of legs. Urojjoda extend 



beyond the terminal abdominal segment. Eyes small. Last segment of 



abdomen about twice as wide as long. 



c. Body convex. Terminal abdominal segment trapezoidal and rugose dorsally. 



Meinerfia (jaudirhaudil (Milne P^ilwards) 

 (■\ Body flattened from fourth segment to end of abdomen. Terminal segment 



semicircular and smooth dorsally Meinertia deplanata ( Bovallius) 



J/. No carina developed on the basis of the legs. Uropoda extend only a little 

 beyond half the length of the abdomen. Eyes large. Last segment of abdo- 

 men nearly three times as wide as long Meinertia gilberti Richardson 



a\ First pair of antennae long, extending to the middle of the first thoracic segment. 

 Second pair of antennre long, extending to the j)Osterior margin of the first 

 thoracic segment, and composed of fourteen articles. Head but little immersi'd 

 in first thoracic segment Meinertin transrrrsa Kichardson 



MEINERTIA GAUDICHAUDII (Milne Edwards). 



Ci/moi}i</a gandichaudi I MihSK Edwakds, Hist. Nat. Crust., Ill, 1S4(), p. 271 



Ceratotlioa rupax HKLhEH, Reise Novara, Oust., 1865, p. 14t), fig. 17. 



Ceratothoa gaudichaudil Schhedte and Meinekt, Naturhistorisk Tidsskrift (:>), 



XIII, 1881-83, pp. 335-340, pi. xiii, figs. 11-15. 

 Meinertia gaudkhaudii Stebbing, Hist, of Crust., 1893, j). 345. — Rh hakoson, 



Proc. IT. S. Nat. Mus., XXI, 1899, p. 829; Ann. Mag. Nat. Hist. (7), IV, 



1899, p. 171; Proc. Wash. Acad. Sci., Ill, 1901, p. 568.— Stebbix(;, Willey's 



Zool. Results, 1902, ]>. 643. 



Localities. — Mazatlan; Pacific Ocean following the shores of Central 

 America; Coquimbo; shores of Chili; Callao; Peruvian shores; C^hin- 

 chenses Islands; IMack Ijight, Albemarle Island, Galapagos Islands; 

 200 miles north of Wenman Island, Galapagos Islands; Panaieti, 

 Loiiisiade Archipelago, New Guinea. 



Found in the mouth of TJiunnus sp. 



Body elongate, nearly three times as long as broad; 16 mm. : 45 mm. 



Head nearly twice as wide as long (4 mm.: 7 mm.) somewhat tri- 

 angular in shape, with apex obtuse. The head is deeph' set in the 

 first thoracic segment, the narrow and acute antero-lateral angles of 

 which extend half the length of the head. E^'es small, distinct, irreg- 

 uhir in outline, l)ut inclined to be square, and placed at the sides of 

 the head, a little below the middle. 



The first pair of antenna? are composed of seven articles, the two 

 first ones being almost fused; they extend just below the eye. The 

 second pair of antennae are composed of nine articles and extend to 



