NO. 1175. ISOPODS OF THE PACIFIC COAST— RICHARDSON. 829 



h' . AlKlonien scarcely immersed. 



First i>air of anteiiiiii^ very much compressed. Segments of thorax either eciual 

 ill length or the lirHt segmcut abruptly longer than the others and the last seg- 

 ment abruptly shorter than the others. Terminal segment of the abdomen 

 varyingin si/.eaudform. Hody sub-oval, more or less contorted. 9. Livoneca. 

 a'. Head not at all immersed. 



b. Body relaxed. Posterior angles of first segment of body prominent or produced, 

 very often acute; posterior angles of the following segments increasing 

 gradually in length, the iirst of these very often scarcely prominent, the 

 posterior ones very often produced, abruptly longer than the first. Epimcra 

 of the lirst segments very often involuted, and extending beyond the i)oste- 

 rior angle of the segment; posterior ones iirodiiced, acute. Sides of the first 

 five segments of abdomen more or less profoundly incised 11. Netocila. 



b'. Body compact. Posterior angles of lirst segment of body scarcely prominent, 

 occasionally produced, tliosci of following five segments scarcely or not at all 

 prominent; those of seventh segment produced. Eitimeia of lirst segments 

 very often almost reaching, or not reaching by a short distance, the posterior 

 angle of the segment. Sides of the first segments of the abdomi^n, whole or 

 obscurely emarginated, of the posterior ones gradually more jtiofoundly 

 emarginated or incised 11. Anilocra. 



8. MEINERTIA Stebbing.' 



15. MEINERTIA GAUDICHAUDII (Milne-Edwards). 



Cymothoa (imidichaudii MiLT<iK-E\yWARD8, Hist. Nat. Crnst., Ill, 1840, p. 271. 

 Ceratolhoa rapax Heller, Keise Norara Crust., XII, p. IIG, iig. 17. 

 Ceratothoa gaudichaiidii SciiitKDXic and Mkinekt, Naturhistorisk Tidsskrift, XIII, 

 1881-83, pp. 335-340, pl. xiii, llgs. 11-15. 



Habitat. — Mazatlan. 



9. LIVONECA Leach. 



ANALYTICAL KEY TO SPECIES OV LIVONECA. 



a. Terminal segment obscurely carinated, and sides enfolded. Caudal appendages 

 destitute- of accessory lamelhe. . .10. Liroueca californica Sehiindte and ISIeiiiort. 

 a'. Terminal segment not carinated, sides not enfolded. Caudal appendages fur- 

 nished with accessory himellic. 

 h. Inner branch of uropoda a little longer and wider than outer branch. Terminal 

 segment sublinguate. Abdomen deeply set in thorax. 



17. lAvoncca vulgaris Stimpson. 

 b'. Inner branch of uropoda a little longer and much narrower than outer branch. 

 Terminal segment semicircular. Abdomen less deeply inserted in thorax. 



18. Livoneca panamensis Schiuidte and Meinert. 



16. LIVONECA CALIFORNICA Schicedte and Meinert. 



Livoneca californica Schicedte and Meinert, Naturhistorisk Tidsskrift, XIV, 

 1883-84, pp. 372-374, pl. xvi, figs. 1, 2. 



Habitat. — Shores of California, near San Francisco. 



' Hist, of Crust., 1893, p. 345. 



