NO. I POINT BARROW AMPHIPODA — SHOEMAKER I5 



the third uropod one of the rami has been lost. The first coxal plate 

 has been lost. The fourth coxal plate in most cases is moderately 

 expanded, but may become so greatly expanded that all of the body 

 appendages are covered when the animal is flexed. 



Eupraxie Gurjanova (1938, p. 261) constructed a key to the genera 

 of the Stenothoidae based upon the variation in these appendages. 

 The present key is based upon that of Gurjanova with the characters 

 arranged in a somewhat different order. 



KEY TO THE GENERA OF THE STENOTHOIDAE 



A. Peraeopods 4 and 5, second joint linear. 



1. Maxilla i, palp i-jointed. 



Mandibular palp absent Parametopella Gurjanova 1938 



Mandibular palp i-jointed Metopelloides Gurjanova 1938 



Mandibular palp 2- or 3- jointed Metopella Sars 1892 



2. Maxilla i, palp 2-jointed. 



Mandibular palp 3-jointed Proholisca Gurjanova 1938 



B. Peraeopod 4, second joint linear; peraeopod 5, second joint expanded. 



1. Maxilla i, palp i-jointed. 



Mandibular palp i-jointed or absent 



Mesostenothoides Gurjanova 1938 

 Mandibular palp 2-or 3-jointed Mesomctopa Gurjanova 1938 



2. Maxilla i, palp 2-jointed. 



Mandibular palp 3-jointed Mesoproboloides Gurjanova 1938 



C. Peraeopods 4 and 5, second joint expanded. 



1. Maxilla i, palp i-jointed. 



Mandibular palp absent Parametopa Chevreux 1901 



Mandibular palp i-jointed Stenothoides Chevreux 1900 



Mandibular palp 2- or 3-jointed. 



Without accessory flagellum Metopa Boeck 1871 



With rudimentary i-jointed flagellum Prometopa Schellenberg 1926 



2. Maxilla i, palp 2-jointed. 



Mandibular palp absent. 



Without accessory flagellum Sienothoe Dana 1852 



With rudimentary i-jointed accessory flagellum 



Microstenothoe Pirlot 1933 



Mandibular palp i-jointed Prostenothoe Gurjanova 1938 



Mandibular palp 2- or 3-jointed. 



Without accessory flagellum Proboloidcs Delia Valle 1893 



With rudimentary i-jointed accessory flagellum 



Mctopoides Delia Valle 1893 



METOPA CLYPEATA (Kroyer) 



Figures 4, k-q, 5, a-f 



Leucothoe clypeata Kroyer, 1842, p. 157; 1845, p. 545, pi. 6, fig. 2a-f. 



Metopa clypeata Boeck, 1871, p. 140. — Hansen, 1887a, p. 90, pi. 3, figs. 3-3b. — 



Stebbing, 1906, p. 175. — Stephensen, 1913, p. 137; 1931, p. 183; 1933, p. 26; 



1944b, p. 57. — Shoemaker, 1930b, p. 263. 



