828 PROCEEDINGS OF THE NATIONAL MUSEUM, 



Habitat. — Cortes Jiauk, Califoruia, to Alaska and Bering Sea. 



12. ROCINELA LATICAUDA Hansen. 



Rocinela laticauda Hanskn, Bull. Mas. Coiiii). Zool., XXXI, 1897, No. 5, pp. 108, 

 109.— Richardson, Troc. Am. Phil. Soc, XXX VII, 1898, pp. 14, 1.5, figs. 5, 6. 



Habitat. — Off Acapulco; near Tres Marias Islands; off Mazatlan; 

 off San Luis Obispo Bay, Califoruia; off Esteros Bay, California; 

 Puget Sound, Washington; Uniinak Island, Alaska. 



13. ROCINELA TUBERCULOSA Richardson. 



Rocinela tiiherciilos:a Ricfiaudson, Proc. Am, Phil. Soc, XXXVII, 1898, p. 16, 

 fig. 10. 



Habitat. — Southern part of Gulf of California. 



Fig. 6— Kocinela reluceps (Stimpson). X2f. 



•14. ROCINELA ARIES SchicEdte and Meinert; 



Rocinela aries Sciikedte and Meinert, Naturhistonsk Tidsskrift, XII, 1879-80, 

 pp. 101-403, pi. XIII, figs. 7, 8. 



Habitat. — Mazatlan; Lower California; Panama Bay. 

 Family VI. CYMOTIIOID^. 



ANALYTICAL KEY TO THE GENERA OF CYMOTHOID^. 



a. Head deeply immersed or set in the first thoracic segment, whose antero-lateral 

 angles project forward. 

 h. Abdomen deeply immersed. 



First pair of ant<>nuie more often dilated, rarely compressed. First four or 

 five segments of body long, snbe(]ual in length, except the first, which is a 

 little longer; last two or three segments abruptly shorter, very often decreas- 

 ing gradually in length. Terminal segment of abdomen subtriangular or 

 semicircular, often bilobed. Body oblong 8. Mcinertia. 



