l68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



moss, and a few yellowish-green pigment spots. The under surface 

 is light with a few red and reddish-orange spots, especially on the 

 legs. The eyes are green. 



The fairly large shrimp Argis lar (Owen) was taken at four sta- 

 tions: Elson Lagoon and at depths of 60 to no feet. One ovigerous 

 female was taken on September 8, 1948. The eggs of this species are 

 large (1,5 to 2 mm, in diameter) and Stephensen (1916) believes 

 that the larvae leave the tgg at a very late stage of development. 

 Free-swimming larvae have been found only in stages that are almost 

 postlarval. 



Although no one haul brought up more than four specimens, 

 Sclerocrangon horeas (Phipps) was the largest and most abundant 

 of the larger shrimps taken at Point Barrow. Its slowness of move- 

 ment probably accounts for the frequency with which it was taken. 

 A total of 16 males, 7 nonovigerous females, and 2 ovigerous females 

 was taken. A few washed ashore, 4 males were taken at 453 feet, i 

 male at 420 feet, and the remainder from depths of no to 213 feet. 

 This shrimp is brown and tan, with a few flecks of chalky white, green, 

 and dull yellow. The orange eggs are about 3.5 mm. in diameter. 

 This shrimp serves as host for a small leech (see "Hirudinea"), and 

 other animals, such as encrusting bryozoans and barnacles, grow on 

 its exoskeleton. Even a small specimen of the clam Hiatella arctica 

 was found under one of the dorsal spines. The very large size of the 

 tgg of S. horeas suggests that in this shrimp metamorphosis takes 

 place inside the &gg. In 5". jerox (Sars), which has an tgg 3.5 mm. 

 in diameter, development is direct and the young have the adult form 

 when they hatch (Koelbel, 1881 ; Wollebaek, 1906). The unusually 

 strong fourth and fifth pairs of pereiopods terminate in a sickle-like 

 claw and for a while these young cling to the abdominal appendages 

 of the mother. If, as seems probable, a similar phenomenon occurs 

 in S. horeas, it would account for the transfer of the leech Crangonoh- 

 della murmanica from the adult to the young shrimps, for the leech 

 hatches from its egg capsule as a young worm. The discovery of this 

 shrimp at Point Barrow extends its range a few degrees both north- 

 ward and eastward. The Point Barrow specimens (up to 124 mm.) 

 exceeded the Icelandic specimens (up to 100 mm.) in length 

 (Stephensen, 1939). 



In view of the number of species in most groups, the small number 

 of species of crabs and hermit crabs was somewhat surprising. Only 

 two hermit crabs and three true crabs were taken — and one of the 

 true crabs was only a sporadic visitor. 



Apparently preferring a muddy bottom, Par gurus splendescens 



