DECAPODS 113 



Crangon nigricauda HOLMES, Occas. Papers Calif. Acad. Sci., vii, 170, pi. 

 II, fig. 31, 1900, but not all refs. to synonymy. 



Carapace only a little more than one third the length of the abdomen, 

 furnished with a single median gastric spine, and a hepatic spine, in a 

 transverse line. Rostrum rather short, grooved, rounded at the tip. 

 Suborbital and antennal spines present, the latter the larger. 



The process on the outer side of the base of the antennules is broad, 

 irregularly ovate, and about reaches the tip of the first joint; flagella 

 longer than the peduncle, the inner one, and sometimes the outer one, 

 exceeding the scale. Antennae as long as, or longer than, the body, 

 acicle about two thirds the length of the carapace, the antero-internal 

 angle rounded and produced, reaching nearly as far forward as the spine 

 at the outer angle (sometimes farther than the spine). The outer maxil- 

 lipeds reach about as far forward as the antennal scale. 



The first pair of feet may extend as far forward as the maxillipeds, or 

 be a little shorter ; merus with a spine near the middle of 

 the lower side; hand oblong, a little more than twice as 

 long as wide, with the edges subparallel; the margin 



, . , , _ , . , , . Fig. 50. CrangoTt 



against which the finger closes is regularly convex and more nigricauda. cheia 

 nearly transverse than longitudinal ; spinous pollex directed Bay, Caiif. 

 obliquely forward. A spine on the sternum between the bases of the 

 third pair of feet. 



Antepenultimate segment of abdomen distinctly carinated in the mid- 

 dle ; the sixth segment has a tendency to become carinated, and has a 

 shallow median groove. Telson grooved above, subacute at tip, and ex- 

 ceeding the sixth plus one half of the fifth. An acute tooth on the sixth 

 segment on either side of the base of the telson, and a spine at the 

 postero-inferior angles, between which there is a median ventral spine 

 curved backward ; the posterior three fourths or more of the ventral sur- 

 face of this segment is marked by a groove. 



Color in life, dark gray with a blackish tail (Holmes). 



Dwiensions. — Length of female (Catalogue no. 3052) from tip of 

 rostrum to tip of telson 68 mm., length of carapace 17 mm., of antennal 

 scale 10.5 mm. 



Distribution.— A.ccor(^\ng to Holmes (who includes here C. alaskensis), 

 this species ranges from Alaska to Lower California. I have seen speci- 

 mens ranging only from Comox, British Columbia, southward, as fol- 

 lows: 



Comox, British Columbia [Albatross). 



Neah Bay, Washington, in drag seine [Albatross). 



Puget Sound (T. Kincaid). 



