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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 3' 



long spine, one on other side; the epimera are in the form of 

 small rounded lobes at the post-lateral angles and are unarmed. 



Fig. 39. — Microprotus c^cds. Second thoracic 



LEG. X 14i. 



Fig. 40. — Microprotus c^cus. 

 First and second pleopods 



OF MALE. X 9§. 



Fig. 41. — Microprotus 

 CiEcus. First thoracic 



LEG. X 14|. 



The abdomen consists of a single large segment, which is produced 

 on either side about the middle in a single long spine, directed out- 

 ward, and at the post-lateral angle in another long spine, also di- 

 rected outward. The abdomen is posteriorly 

 produced in a process terminating in two long 

 spines, one on either side of the median line. 

 At the base of the abdomen in the median line 

 is a single small tubercle. There is also a 

 single small tubercle in the middle of the 

 segment on the dorsal surface. The peduncle 

 of the uropoda is long and slender, and 

 reaches almost to the extremity of the ter- 

 minal spines of the abdomen. The branches 

 are about equal in length and also about as long as the peduncle. 



The first pair of legs are very small, short, and feeble. The fol- 

 lowing six pairs are robust and similar in character. The second, 



third, and fourth pairs gradually in- 

 crease in length. All the articles are 

 long and slender, especially the merus 

 and propodus. The legs terminate in 

 bi-unguiculate dactyli. 



Only a single specimen, a male, was 

 collected at station 4781, on the way 

 from " Petrel Bank," Bering Sea, to 

 McDonald Bay, Agattu Island, Aleu- 

 tians, by the passage east of Semisopo- 

 chnoi and Amchitka Islands at lat. 52° 

 14' 30" N. ; long. 174° 13' E. at a depth 

 of 300 fathoms in fine gray sand and 

 pebbles. An imperfect specimen, a male, also comes from the same 

 locality. 



Type-specimen.— Cat. No. 39521, U.S.N.M. 



Fig. 42. — Microprotus cecus. 

 Sixth leg. X 141. 



