66 RATHBUN 
SPIRONTOCARIS MURDOCHI Rathbun. 
Plate 11, fig. 6. 
Hippolyte spinus MURDOCH, Report Internat. Polar Exped. to Point Barrow, 
Alaska, 140, 1885. Not Cancer sfpinus Sowerby. 
Spirontocaris murdochi RATHBUN, Proc. U. S. Nat. Mus., XXIV, 893, 1902. 
Very near S. “deborgi and S. spina. 
Female stout. Rostrum three fourths as long as carapace, not reach- 
ing tip of antennal scale. Carapace cristate, except on posterior fourth, 
and furnished with 3 or 4 large teeth. Midrib 
LA of rostrum nearly horizontal ; tip acute ; upper 
limb with convex upper margin, armed with 20 
or 22 small irregular teeth; lower limb, also with 
oi aaa Re eee me- convex margin, deeper than the upper, and fur- 
(X 18). Station 3650. nished with 1 to 4 small teeth near the extremity. 
Two supraorbital spines, one antennal, and one pterygostomian spine, 
all well developed. 
Eyes of moderate size, slightly pyriform, the width of antennular 
peduncle and half its scale. Antennular peduncle extending three fifths 
the length of the antennal scale; second segment twice as long as third; 
basal scale reaching nearly to end of second segment; thickened portion 
of outer flagellum reaching about to tip of antennal scale. Antennal 
peduncle reaching slightly beyond the first segment of the antennular 
peduncle; scale narrow-ovate, about as long as the rostrum, its spine 
reaching about as far forward as the blade. 
Outer maxillipeds rather broad and reaching nearly to tip of acicle. 
First pair of feet extending a little beyond antennal peduncle, the second 
pair beyond acicle, fifth pair nearly to tip of maxilliped; dactyli of last 
three pairs long and slender, that of last pair half as long as propodus. 
Abdomen not carinate; third segment produced well backward; 
fourth provided with a lateral spine; sixth three fourths as wide as long, 
and about three fifths as long as the seventh, which has 3 pairs of lateral 
spinules. 
Male.—The male differs from the female in the same manner as in S. 
“iljeborgii; it is smaller and slenderer than the female, rostrum and anten- 
nules longer, dorsal teeth much reduced. 
Dimensions.— 9, length 46.6 mm., length of carapace and rostrum 17 
mm., of rostrum 7.5 mm. 
Distribution.—Arctic coast of Alaska; Kamchatka; Okhotsk Sea. 
Rare. Taken at the following localities: 
Lat. 71° 02/ 00’ N., long. 157° 46/ oo” W., 19 fathoms, 1 4 (U.S. R. S. 
Corwin). 
