168 DISCOVERY REPORTS 



Remarks. M. australe very closely resembles M. mixta Lilljeborg, a species well known from Scan- 

 dinavian waters and from the coasts of Iceland and Greenland, and common along the east coast of 

 North America, from the shores of Canada in the north to Woods Hole in the south. It may be dis- 

 tinguished from this species by the acutely pointed rostrum, the reduced gnathobasic lobes on the 



Fig. 41. Mysis australe sp.n. A, anterior end of immature female in dorsal view, x 20; B, mandibles, x 25 ; C, maxilla, X25; 

 D, endopod of first thoracic appendage, x 25 ; E, second thoracic appendage, x 25 ; F, endopod of fifth thoracic appendage, 

 x 25; G, right uropod, x 25; H, telson, x 25. 



third segment of the endopod of the third thoracic appendage, and by the virtual absence of the lobe 

 on the fourth segment, by the fewer sub-segments of the carpo-propodus of the third to the eighth 

 thoracic endopods and, mostly, by the armature of the uropods and telson. In M. mixta the endopod 

 of the uropod is a little longer than the telson and is armed along only the proximal three-quarters of 

 its length with a row of 13-15 practically equal spines. The larger number of spines extending right 



