Pacific Coast of North America. 1G9 



r. First thoracic segment with 

 antero-lateral angles produced 

 horn-like at sides of head. 

 Frontal margin of head pro- 

 duced. Spots wanting on 

 fourth and fifth abdominal 

 segments and base of terminal 



segment 10. R. cornuta, Richardson. 



c'. First thoracic segment normal. 

 Frontal margin of head not 

 produced. Spots present on 

 fourth and fifth abdominal 

 segments and base of terminal 



segment 11. iJ. belliceps (Stimpson). 



b' . Propodus of prehensile legs with 



five or six spines 12. R. laticauda, Hansen. 



a' . Flagellum of second pair of antennae 

 with ten to eleven joints. 

 b. Tubercles developed on all the 



segments of the body 13. i?. ttthercuhsa, Richardson. 



b'. No tubercles developed on body. 

 Terminal segment of body orna- 

 mented with a very wide cres- 

 centiform band, from whose 



posteriorborder three large hasti- [nert. 



form stripes project backwards . 14. R. aries, Schiodte & Mei- 



10. Rocinela cornuta, Richardson. 



Rucinela cornuta, Richardson, Proc. Am. Phil. Soc. xxxvii. 1898^ 

 p. 12, figs. 1, 2. 



JJab. Off Shumagin Bank, Alaska. 



11. Rocinela helliceps (Stimpson). 



^ga belUceps, Stimpson, Proc. Acad. Nat. Sci. Philad. xvi. 1864, 



p. 155. 

 Mga alaskeiisis, Lockington, Proc. Cal. Acad. Sci. vii. 1877, pt. i. 



p. 46. 

 Rocinela alascensis, Richardson, Proc. Am. Phil. Soc. xxxvii. 1898, 



p. 11. 



Hob. Cortes Bank, California, to Alaska and Bering Sea. 



12. Rocinela laticauda, Hansen. 



Rocinela laticauda, Hansen, Bull. Mus. Comp. Zool. xxxi. 1897, no. 5, 

 pp. 108, 109 ; Richardson, Proc. Am. Phil. Soc. xxxvii. 1898, 

 pp. 14, 15, figs. 5, 6. 



Hah. Off Acapulco ; near Tres Marias Islands ; off Mazat- 

 lan ; off San Luis Obispo Baj, California ; off Esteros Bay, 

 California; Puget Sound, Washington j Unimak Island, 

 Alaska. 



