304 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Ambulatory appendages: Moderately long, moderately heavy, with 

 many complex spines. The 1st and 3rd coxal joints are smaller than the 

 2nd. The femur and 1st tibia are about the same length. The 2nd tibia is 

 longer. The 1st tarsus is moderately developed, the 2nd is heavy, some- 

 what curved, about half the length of the 2nd tibia. The unpaired claw 

 is % the length of the 2nd tarsus. At the basal joint of the 1st tarsus there 

 are several strong teeth. At the basal ventral part of the 2nd tarsus there 

 are 3 strong teeth, followed by an even row of 15 or more regular, rather 

 smaller teeth or hairs. This joint bears a few lower hairs dorsally and 

 laterally. 



Color: Straw, with lighter brown in the heavily chitinized parts. 



There is a little knob bearing spines in each transverse process dorsally 

 on its distal end. The 1st coxal joint bears a number of compound spines 

 directly at its distal end. The 2nd coxa bears several spines. The 3rd 

 coxa bears a few short hairs about its margin. The femur is curved, 

 bellowed out dorsally, and projects vertically. In the middle of the 

 shaft laterovertically is a pair of large upward-extending spines. There 

 are a few scattered compound spines here and there, and at the distal end 

 near the joint there are 3 large compound spines with 1 or more smaller 

 ones behind each of the larger. The 1st tibia bears 2 areas of large spines 

 on its upper margin, 6 or more at the proximal end, 3 being especially 

 large, composed of at least 4 large distal spines, a few smaller ones in 

 rows, and a few short hairs. The 2nd tibia bears a group of large com- 

 pound spines of various lengths, especially on its proximal end. There are 

 about 8 of these, approximately in 2 rows, the vertical ones being the 

 largest. There are a few scattered spines, mostly smaller toward the distal 

 end on the outer side. The under sides of the 2 tibiae bear many fine hairs, 

 especially numerous on the 2nd tibia. 



Type: A female from a group of three, U.S. National Museum, no. 

 532, in the San Francisquito Bay, Lower California, sand and kelp, 

 March 2, 1936, 26 fms., Hancock Expedition, accession no. 139772. 

 Another male of the same species with eggs, U.S. National Museum, 

 Marchena Island, Galapagos, shore, reef and spit, north end of Island, 

 December 2, 1934, Hancock Expedition, no. 131571. This species re- 

 sembles N. spinosisshna most closely. It differs in having 2 dorsal spines 

 instead of 3. It also has a cheliforus more trumpet shaped, with the 3rd 

 joint hidden. Its abdominal appendage does not have so many spines, and 

 the spines on the legs, although quite similar in arrangement, have many 

 differences. The little limbs with spines on the dorsal distal surfaces of the 



