1913] Hall: rtjcnogonida from the Coaxt of California 137 



are three or four stout spines, while the rest of the spines on the 

 "sole" are short, fine, and often not apparent (figs. 1, 2, 5). 



Legs of female similar except in following particulars: 

 appearance much stouter than those of male on account of the 

 femora, which are swollen with ova. Blunt spurs, similar to 

 those on coxae I of male, occur in similar positions on coxae I of 

 legs II and III in female. Coxa II is one and one-half times 

 the length of coxa I ; it is constricted at the base and is without 

 projections. Femora are swollen to almost twice the diameters 

 of coxae I, slightly longer than combined lengths of coxae I, II, 

 and III; with slight rounded spurs on disto-superior corner. 

 Tibial joints not quite so long as, and about half the diameter of, 

 the femora (figs. 4, 5). 



Color straw, eyes and eggs black. 



Mea.surements of a. nucliuscula in Millimeters 



Typec? Type? 



Length 1-86 2. 12 



Proboscis 0.72 0.87 



Body 



Caudal segment 



1. 0.74 



0.1 0.51 



Span of processes II 0.^3 0.9 



Leg III (approximate) 3.69 4.^^ 



Eemarks.—Tv,'o specimens, one male and one female, were 

 kindly loaned me by Professor C. A. Kofoid of the University of 

 California. They were taken from Tuhularia on piling of the 

 Key Koute Wharf in San Francisco Bay, March 27, 1912. 



Comparisons. — This species is nearest to Ammothea alaskensis 

 Cole but differs in the following particulars: no protuberances 

 on leg-bearing processes ; no spines on caudal segment ; no con- 

 striction on distal half of proboscis; no triangular projection 

 distally on dorsal side of first joint of chelifore, but instead two 

 bristles distally on ventral side of same; protuberance on coxae 

 I not by any means "hing and slender"; no row of slender 

 bristles along dorsal curve of tarsus apparent ; female one-seventh 

 larger than male instead of "slightly smaller" than male, as in 

 A. alaskensis; on the whole a much less hairy species than any 

 of this genus hitherto described from the Pacific Coast of North 

 America. 



