no. 1701. NORTHWEST PACIFIC ISOPODS— RICHARDSON. 



87 



Family CYMOTHOIDiE. 

 Genus MEINERTIA Stebbing. 



MEINERTIA TRIGONOCEPHALA (Leach). 



Cymothoa trigonoccphala Leach, Diet. Sci. Nat., vol. 12, 1818, p. 353. — Milne 



Edwards, Hist. Nat. Crust., vol. 3, p. 272. — De Haan, Faun. Japon., vol. 50, 



1850, p. 227, fig. 7a-b. 

 Ceratothoa trigonocephala Schicedte and Meinert, Naturhist, Tidsskrift, (3), 



vol. 13, 1883, pp. 358-364, pi. 16, figs. 1-7. 

 Meinertia trigonocephala Stebbing, Hist. Crust., 1893, p. 354. — Richardson, 



Proc. U. S. Nat. Mus., vol. 27, 1904, p. 46. 



Locality. — Tanegashima, Japan. 



Genus LIVONECA Leach. 



LIVONECA PROPINQUA Richardson. 



Livoneca propinqua Richardson, Proc. U. S. Nat. Mus., vol. 27, 1904, pp. 37-38. 



Localities.— Station 5060, at Ose Saki, S. 53° E., 7.3 miles (lat. 35° 

 06' N. ; long. 138° 40' 10" E.) ; station 4967, going from Kobe, Japan, 

 to Yokohama, Japan, at Shio Misaki Light, 

 N. 83° E., 6.5 miles (lat. 33° 25' 10" N. ; long. 

 135° 37' 20" E.). 



Depth. — One hundred and ninety-seven 

 fathoms in coarse black sand; 244 fathoms in 

 brown mud, sand, and foraminifera. 



Host. — Mouth cavity of chalinura. 



LIVONECA SACCIGER, new species. 



Body of adult female, ovate, 20 mm. wide 

 and 34 mm. long. Surface smooth. Color, 

 in alcohol, pale yellow. 



Head almost as long as wide, 4 mm. : 5| mm. 

 Anterior margin rounded and produced in a 

 small median point. Posterior margin rounded. FlG 12.— livoneca sac- 

 Eyes almost entirely absent, with only a slight ciger. x 1.5. (Drawn 

 trace of them. First pair of antenna), com- 

 posed of eight articles, extend to the antero-lateral angle of the 

 first thoracic segment. Second pair of antennae, composed of twelve 

 articles, extend to the middle of the first thoracic segment. 



The first thoracic segment is 3 mm. long, the second 2j mm., the 

 third 3^ mm., the fourth and fifth each 3f mm., the sixth 3J mm., the 

 seventh 2 mm. 



The first segment has the antero-lateral angles acutely produced. 

 Epimera are present on all the segments, with the exception of the 

 first, in the form of elongated plates, extending the entire length of 



