DECAPODS 103 



segment instead of reaching to the end of it ; but the most striking char- 

 acter is the unusual length of the fingers, which exceed the palm in 

 length and are rather slender, giving the chelae a PaIamon-\ike appear- 

 ance ; in the ? , on the contrary, the fingers are considerably shorter 

 than the palm, as in most species of the genus. 



SPIRONTOCARIS STONEYI Rathbun. 

 Spirontocaris stoneyi Rathbun, Proc, U. S. Nat. Mus., xxiv, 899, 1902. 



Near S. cristata ; a small, slender species. Rostrum about half as 

 long as the carapace and reaching a little beyond first segment of anten- 

 nular peduncle ; upper margin 

 convex and armed with 7 to 

 9 teeth ( I or 2 of which are on 

 carapace), except near the tip, 

 where it is straight and un- 

 armed; tip pointed; midrib Fig. 46^ Spir^nibcaHs^stoneyi 



nearly straight, lower margin 



with a tooth near the tip. A strong antennal, a short but 



slender pterygostomian, spine. 



Antennular peduncle reaching to middle of antennal scale ; 

 second segment one and a half times as long as third ; outer 

 scale not reaching end of first segment; thickened portion 

 of outer flagellum reaching about to end of antennal scale. 

 Scale as long as carapace ; spine reaching as far as blade ; 

 peduncle reaching a little beyond first segment of anten- 

 nular peduncle. Maxillipeds very slender, reaching to the 

 distal third of the antennal scale ; the first pair of feet to a little beyond 

 the antennal peduncle, the palm widening distally and only a little 

 longer than the fingers ; second pair of feet about reaching tip of scale. 



Fourth abdominal somite unarmed ; sixth long, over i^ times as long 

 as fifth, and as long as telson, which has 3 pairs of side spines. 



Dimensions.— Ytmdlt, length 20 mm., length of carapace and rostrum 

 5.5 mm., of rostrum 1.8 mm. 



Type locality. —'Rex'mg Sea, lat. 62° 15' 00" N., long. 1670 48' 00" W., 

 20^ fathoms (Lieutenant George M. Stoney, U. S. N., June, 1884). 



SPIRONTOCARIS AVINA Rathbun. 



spirontocaris avina Rathbun, The Fur Seals and Fur-Seal Islands of the 

 North Pacific Ocean, ill, 557, 1899. 



Carapace with anterior half carinated ; rostrum half or less than half 

 the length of the carapace, reaching to end of first antennular segment ; 



