NO. 9 HILTON : PYCNOGONIDS 285 



dorsal side, and it is continued out into a narrow tube which projects 

 distally as the end of the opening of the agglutinative gland whose secre- 

 tion is supposed to fasten the eggs together. The 2nd tibia is slightly 

 longer than the 1st, and both are shorter than the femur. At the distal 

 end of the tibia there is a projection similar to the one on the femur but 

 smaller, but also with a hair. About 1/4 of the distance from the distal end 

 of the 2nd tibia on the dorsal side is a slight elevation which has a long 

 hair projecting from it. The 1st tarsal joint is very small, roughly tri- 

 angular, with a broad ventral base with a few moderately strong hairs 

 and a dorsal knob. Tarsus 2 is rather slender, about equal to coxa 2. It is 

 not strongly cui"ved but appears arched on the ventral side because it is 

 much expanded at the base, where it has 2 stout, distally curved spines 

 and a few smaller hairs. The proximal half of the remainder of the ven- 

 tral margin or the sole is armed with 2 stout, distally curved spines and 

 some smaller hairs. The proximal half of the rest of the ventral margin 

 is armed with a series of close-set distal curved spines varying from 7 

 to 11. Along the distal part is a thin lamellar knifelike chitinous plate 

 along the sides of which are a ver>' few bristles. 



The claw is long, curved, reaching as far back as the heel. Its inner 

 edge is thin, knifelike. Auxiliaiy claws are verj'^ small but distinct with 

 the sole with about 6 spines and a row of 6 or more before the knifelike 

 plate. The legs have few hairs. 



Color: Pale, little color in legs or body. 



Cole's specimens were as follows: 6 males, 1 female, collected by 

 Professor Kelsey, Sept., 1896, San Diego, California; 1 female, July 8, 

 1895, collected at San Diego by Dr. S. J. Holmes. 



This species is similar to A. petiolatus Kroger. In petiolatus the trunk 

 is stouter, lateral processes are not so much separated, the caudal segment 

 is long and cylindrical, abruptly acuminated, and placed horizontally. The 

 proboscis is of simple cylindric form. The immovable finger of the chela 

 is nearly straight. The ovigera are as long as the animal. The legs are 

 shorter, being not more than twice the length of the animal. The 2nd 

 tarsal joint is more strongly curved with 4 to 6 spines on the proximal 

 part of the sole. First, there are 2 large medial spines; then, 2 pairs of 

 smaller ones. 



This species I have found in great abundance associated with Tubu- 

 laria croecia and Coryomorpha. In the former case the complete life his- 

 tory was found associated with these hydroids. Very early stages, shortly 

 after leaving the male, migrate to the coelenteric cavit^'^; later, after sev- 



