NO. I POINT BARROW AMPHIPODA — SHOEMAKER I9 



character, and that this palp is being reduced to a i-jointed appendage. 

 The mandible of Metopa glacialis has a 3-jointed palp, as shown in 

 figure 5, i. 



The specimens here figured measure about 7.5 mm. and were 

 taken at Dodge Harbor, Nunivak Island, Alaska, by Woodbridge 

 Williams. These specimens agree in every particular with specimens 

 taken at Point Barrow, and all have a i -jointed palp to the first 

 maxilla. Specimens of Stenothoe dypeata Stimpson taken in the Bay 

 of Fundy near Grand Manan agree with the specimens of glacialis 

 taken at Point Barrow. In the Alaskan specimens the telson appears 

 to be a little longer, reaching just beyond the end of the peduncle 

 of uropod 3. 



Metopa glacialis (Kroyer) has been recorded from Spitzbergen, 

 White Sea, Iceland, and West Greenland. 



Metopa dypeata (Stimpson) has been recorded from the Bay of 

 Fundy, 



Metopa cariana Gurjanova has been recorded from Nova Zembla 

 and East Greenland. 



The animals described under these three names appear to represent 

 one and the same species and are being placed under the oldest name, 

 Metopa glacialis (Kroyer). Metopa dypeata (Kroyer) is a distinct 

 species and not at all like Stenothoe dypeata Stimpson. Stebbing 

 (1906, Das Tierreich, p. 725) makes Stenothoe dypeata Stimpson 

 a synonym of Metopa groenlandica (Hansen), but this is not correct, 

 as the two species, though related, are distinct. 



Stephensen and Thorson (1936, pp. 1-7) record M. groenlandica 

 as being commensal in the mantle cavity of the lamellibranch. Pandora 

 glacialis Leach, found on the east coast of Greenland. Ten specimens 

 of Metopa glacialis have been found in the mantle cavity of a 

 lamellibranch, Mediolaria discors Linn., dredged in about 3 fathoms 

 in the St. Croix River, New Brunswick, near the Atlantic Biological 

 Station. 



There are in the United States National Museum specimens of 

 M. glacialis taken at Dodge Harbor, Nunivak Island, Alaska, by 

 Woodbridge Williams in the summer of 1937, and 5 specimens taken 

 by Dr. Waldo L. Schmitt, October 8, 1940, between Inner Iliasik and 

 Goloi Island, Alaska, while on the Alaska king crab investigation. 

 The present records are the first for Metopa glacialis in Alaska. This 

 species reaches a length of 7 to 8 mm., and has been recorded as low 

 as 275 m. 



