PaciJiG Coast of North America. 



173 



All the epimera are long and narrow and more or less roundel 



posteriorly; they extend fully to the posterior angle of their 



corresponding segments, a character 



not found in any other species of the Fig. 7. 



genus. 



The first abdominal segment is 



partly covered at the sides by the 



last thoracic segment. The firsl five 



segments are about equal in length 



and width. The terminal segment 



is slightly wider than long, equal in 



length to the otjier abdominal seg- 

 ments taken together, is impressed at 



the base, and posteriorly rounded. 



The uropoda are longer than the last 



abdominal segment. Both branches 



are similar in shape and size; they 



are oar-like, with truncately rounded Anihcra occidentalis. x 4. 



extremities. 



The legs increase slightly in length. The basis of all the 

 legs is carinated on the inferior margin. 



Colour a light brown, marked with numerous black dots 

 over the whole surface of the body, with the exception of t!ie 

 posterior half of the last abdominal segment and the inner 

 branch of the uropoda, which are a light clear yellow without 

 spots. The outer branch of the uropoda, which is almost 

 black, contrasts in a marked degree with the light inner 

 branch. In the caudal segment the ciiange from the darker 

 to the lighter half is graduated, making the contrast less 

 marked. 



Two individuals of this species were taken : one by the 

 U.S. Fish Commission steamer 'Albatross,' station 3138, at 

 a depth of 19 fathoms, and one by Dr. D. S Jordan, both at 

 Monterey Bay, California. One was imperfect. 



Type. No. 22567, U.S. N. M. Monterey Bay. Depth 

 19 fathoms. 



When compared with A. Icevis, Miers*, from Peru, this 

 species differs in the shape of the anterior portion of the head, 

 which in A. Icevi's is narrowed and rounded, while in A. occi- 

 dentalis it is truncate ; in the greater length of the first 

 thoracic segment and the equality in length of the succeeding 

 segments in A. occidentalis, wlnie in A. Icevis the sixth seg- 

 ment is the longest, tlie others being of nearly cqu:d length; 

 in the length of the epimera, which in A. occidantalis attain 



• Proc. Zool. Soc. London, 1877, p. G72, pi. Ixviii. fig. 6. 

 Ann. <Sc Mag. N. Hist. Ser. 7. Vol. iv. 13 



