NO. 9 HILTON : PYCNOGONIDS 287 



Abdominal segment: About the same size as the eye tubercle but 

 more regular. Deeply and closely pitted. 



Chelifori: Large, quite well-developed chelae. The whole append- 

 age extends about ^o their length bej'ond the proboscis. A few short 

 spines arise on the chelae. Legs rather long, stout, with very few hairs. 

 First coxa shorter than its diameter, 2nd over twice the length of the 1st 

 and enlarged at its distal end. Third coxa X^o times the length of the 1st. 

 Femur longer than the coxae together. Tibial joints about % the length 

 of the femur. Tarsus about % the length of the tibial joints. Claw % 

 the length of the tarsus, auxiliary claws very small. 



Measurements of the type were: Proboscis, 1.42; body from pro- 

 boscis to abdomen, 1.5; leg, 8; lateral processes of the body, 0.428 

 diameter. 



Hall's specimen was taken from Fucus at low tide. It was observed 

 feeding on a nudibranch. 



This species resembles A. erectus Cole. In 1913 Hall gave notes on 

 this species. In 1912 a number were collected at the bases of Phylospadix 

 at low tide, several specimens of both sexes being obtained. The male was 

 found to be % smaller than the female, with 6-jointed ovigers, the last 3 

 segments of which were spirally coiled and closely set with spines, mostly 

 directed proximally. There were several groups of eggs. Chelae of both 

 sexes were often bent in front of the proboscis. The eye tubercle and ab- 

 domen project from the body at about the same angle, but not quite per- 

 pendicularly. The protuberance on the distoinferior aspect of the 2nd 

 coxal joint is about twice as long in the male as in the female. Openings 

 of the cement gland of the male were on the superior aspect of the femur 

 about halfway down on legs 2, 3, and 4. 



Measurements: Length, female type, 3; male, 3.6; maximum, 3.8. 

 Proboscis, female type, 1.5; male, 1.5; maximum, 1.6. Body, female type, 

 1.5; male, 1.8; maximum, 2.1. Span of 2nd process, female type, 1.5; 

 male, 1.8; maximum, 2.1. Caudal segment, female type, 0.6; male, 0.53; 

 maximum, 0.65. Third leg, female type, 8.5; male, 9; maximum, 10.2. 



Color: Dark straw. 



This species is very close to xi. erectus Cole. The chief differences are 

 as follows : The lateral processes are not so widely separated and in some 

 specimens may even touch at their bases. This, however, I consider of 

 minor importance because the condition of the body, perhaps individual 

 variation, makes a difference here. The tarsus is different in the two, 

 being more robust in both claw and 2nd tarsal joint in this species than in 

 A. erectus. 



