NEW MARINE ISOPODS — MENZIES 135 



tent of the median lobe of the posterior margin and that the posterior 

 margin has concave lateral areas and a single convex median lobe. 



First antenna. — Similar to that of /. davisi (compare figs. 19, 5, and 

 24,&). 



Maxilliped. — With two coupling hooks. 



Maxillae. — Similar to those figured for /. rajata (see figs. 21, c, 

 and 22, e). 



Mandible. — In general as that figured for genotype. Right man- 

 dible with incisor process having five teeth, setal row with ten setae, 

 molar process with numerous setae along denticulate inferior margin 

 and a large tooth ; palp 3-jointed, second joint as shown in figure 24, c. 

 Left mandible differs from right in having seven setae in setal row and 

 a 4-toothed lacina. 



Pleopods. — The male first pleopods have not as yet been described or 

 figured. The specimens I have seen were all females. 



Measurements. — Figured female paratype, length 4.9 mm., width at 

 widest part of second peraeon somite 2.0 mm. 



Type locality. — Hood Canal, Wash. 



Geographical distribution. — Pacific coast of North America from 

 Alaska to Washington. 



Material examined.'^ — Alaska : Dall Island., Cape Mazon, September 

 4, 1934, TO meters, 1 female. British Columbia: Langara Island., 

 Egeria Bay, September 3, 1934, 50-90 meters, 1 female. Washington : 

 Cypress Island., August 7, 1940, 30 fathoms, 1 female; Hood Canal., 

 July 26, 1940 (T. Kincaid), 10 females; Waldron Island., August 6, 

 1940, 40 fathoms (M. H. Hatch) , 1 female. 



Remarks. — The original figure of the cephalon of /. solasteri (Hatch, 

 1947, fig. 160) is, I believe, misleading in that the anterolateral lappets 

 of the cephalon, a conspicuous feature of this species, appear to be 

 bent downward and inward to give a most unusual appearance to the 

 cephalon. All the paratypes of this species that I examined had 

 cephalons similar to that shown in figure 24, a. In one specimen the 

 rostral process was bent considerably downward; however, it was 

 apparent that this was accomplished by some external force and was 

 not a natural condition. 



JANIRALATA OCCIDENTALIS (Walker) 



Figures 23, a-6, 



Janira occidentalis Walker, 189S, pp. 280-281, pi. 15, figs. 7-10. — Richardson, 

 1899a, p. 859 ; 1899b, p. 326 ; 1900, p. 300 ; 1904a, p. 224 ; 1904b, p. 667 ; 1905, pp. 

 472-473, figs. 526-528.— Stafford, 1913, pp. 183-185, fig. 7.— Hatch, 1947, 

 p. 172, pi. Ill, figs. 35-36. 



♦Paratype females kindly lent to the writer by Dr. Melville H. Hatch, Zoology Depart 

 ment, University of Washington, Seattle, Wash. 



