NO. 9 HILTON: PYCNOGONIDS 291 



in some deep-sea specimens, and the females or young sometimes had 

 stubs of chelifori and attachment discs on the lower side of the base of 

 the proboscis. 



Material: Three specimens of this species, 1 male, 2 females, are 

 from Station 719-37, Consag Rock, Lower California, Mexico, March 

 24, 1937, on or associated with a basket-star, at a depth of 10 to 25 fms. 

 One specimen, Laguna Beach, 1939. 



Family TanystylidaC Schimkewitsch, 1913 



Chelifori, rudimentary or lacking. Palpi sometimes longer, some- 

 times shorter than the proboscis, 4 to 7 joints. Ovigers developed in both 

 sexes. Sometimes curved at the ends, the terminal joints with or without 

 spines irregularly arranged. The body is concentrated and the segments 

 fused with each other. Four pairs of ambulatory legs. Sex openings in 

 various genera in various positions: in the male, in the 2nd, 3rd, and 4th 

 leg pairs in Tanystylum and Austroraptus ; in the 3rd and 4th leg pairs 

 in Discoarachne and Trigaelus; and in the 4th pair in Rhynchothorax. 

 In the female the openings are in all leg pairs except in Tanystylum, in 

 which they are in the 3rd and 4th pairs, and in Rhynchothorax, in which 

 they are in the 4th pair. 



Genus TANYSTYLUM Miers, 1879 



Trunk broad, with short lateral processes not widely separated from 

 each other. Body not segmented, disc shaped. Chelifori lacking or repre- 

 sented by a small 1- to 2-jointed appendage, which may bear jaws in 

 immature specimens. Palpi 6- to 7-jointed. First and 3rd joints short, 2nd 

 and 4th longer. Femoral joints of female often enlarged. 



Tanystylum californicum Hilton, 1939 

 Plate 40 



Tanystylutn californicum Hilton, Jour. Ent. and Zool., vol. 31, 1939, 

 p. 32. 

 Diagnosis: Body as a whole circular in outline. Skin pitted, dark, 

 strongly chitinized. Lateral processes separated by narrow intervals. Lat- 

 eral processes with 2 moundlike elevations on their free margins on the 

 dorsal side. Second tarsal joint with 3 strong teeth on the rather definite 

 heel. Lateral claws less than % the length of the long claws. 



