124 RATHBUN 



segment has a deep median sulcus. The abdominal sulci are filled with 

 a thin short pubescence easily rubbed off. The sixth segment is about 

 one and a third times as long as the fifth. 



Dimensions. — Female (station 3441), length from tip of rostrum to 

 tip of telson 64 mm., length of carapace 16 mm., length of antenna! 

 scale 10.5 mm. 



Harriman Expedition. — Juneau, 20 fathoms. 



JDistribution. — From Bering Sea to San Diego, California (including 

 Puget Sound and Strait of Fuca), 20-309 fathoms; taken at 142 

 stations by the Albatross, often in large numbers. Less abundant at 

 southern localities. Off southeastern coast of Kamchatka, 96-100 

 fathoms, at two Albatross stations. 



Two specimens were received from the Hopkins Laboratory at Pacific 

 Grove ; they were probably taken in deep water. 



One specimen was collected at Port Etches, Alaska, in 12-18 fathoms, 

 by W. H. Dall. 



Variations. — The rostrum in normal individuals does not extend be- 

 yond the eyes ; in many cases, however, it is evident that the rostrum 

 has been broken off or injured and later renewed, the new rostrum having 

 a narrow, elongated, and ascending tip exceeding the eyes, but of variable 

 length. In other respects these abnormal forms do not differ from the 

 types. 



CRANGON RESIMA Rathbun. 



Crangon resima Rathbun, Proc. U. S. Nat. Mus., xxiv, 889, 1902. 



Near C. communis. Carapace and rostrum a little more than one 

 third the length of the abdomen ; a median carina on the middle third 



of the carapace, armed with two spines, not 

 far apart, the posterior larger and more ele- 

 vated and in front of the middle. A sharp 

 hepatic spine is in a transverse line with the 

 anterior median spine and terminates a short 

 but prominent carina. Rostrum long, narrow, 

 _ J pointed, advanced beyond the eyes, ascend- 

 "' / ing at an angle of about forty-five degrees. 

 Fig. 6s. Crangon resima. ? . slightlv curvcd, and prolonged dowuward in 



Station 2935. a. Dorsal view of an- o ./ ' s: a 



terior part of carapace (X 2). b ^ thin comprcsscd plate which appears spatu- 



Side view of same (X 25). c. Acicle ^ ■*■ s: i: i: 



(X 3z)- d- Chela (X 4)- late in a side view. The development of this 



plate is dependent on age ; specimens 20 mm. long show no evidence of it. 



The second segment of the antennular peduncle is three times as long 



as the third ; the scale on the outer side at the base is very thin and 



