134 



RATHBUN 



Cape Etolin, Nunivak Island, 8 fathoms (W. H. Dall). 

 Various localities in the Aleutians and Alaska Peninsula, 6-28 fathoms 

 (W. H. Dall). 



SCLEROCRANGON ALATA Rathbun. 



Plate in, fig. 2. 

 Sclerocrangon alata RATHBUN, Proc. U. S. Nat. Mus., xxiv, 891, 1902. 



Allied to S. boreas. Carapace only slightly broader than long ; surface 

 very uneven, sculptured and pitted. Median carina armed with a small 



spine just behind 

 the orbits, a still 

 smaller one at 

 the middle of the 

 carapace, and a 

 tubercle near the 

 posterior mar- 

 gin. Rostrum 

 with an acute 



FIG. 72. Sclerocrangon alata. 9 (X 2). Station 2865. a. Dorsal view of P 



carapace and abdomen, b. Side view of carapace. Curved tip. A 



spine at the outer angle of the orbit. Antero-lateral angles broadly 

 alate. Branchial carina having a strong anterior spine; posterior half 

 protuberant and deeply pitted, as is also the surface below the crest. 

 The spine of the antennal scale extends as far as or a little farther than 

 the blade. 



The first pair of feet have a strong upper distal spine on the merus, a 

 large outer dentiform expansion on the carpus, and a 

 very short stout hand less than twice as long as broad, 

 the anterior margin nearly transverse and the spine nearly 

 longitudinal. 



The abdomen is sculptured. 



The median carina of the first five segments is very 



3 - 



blunt, and on the third segment especially prominent. a - Acicle - b - Chela - 

 The pleura are without spines. The lateral spinules (one or two pairs) 

 on the telson are situated at about its middle. 



Dimensions. Male, length 38 mm., length of carapace n mm., width 

 of carapace at branchial spine 10.7 mm., length of hand 4.4 mm., width 

 of hand 2.5 mm. A female 25.7 mm. long is laden with ova. 



Distribution. From Bering Sea to Puget Sound, 6-9 1 fathoms. 

 Usually not more than one or two specimens in a haul. 



Taken at the following localities by the Albatross: 



FIG. 73. Sclero- 

 (X 3i)- Station 2865. 



