NO. 3 BARNARD: THE PHOXOCEPHALIDAE 263 



Peraeopod 3 : articles 4 and 5 broadly expanded, but slightly narrower 

 than article 2, article 6 more than three fourths as long as 5. Ratio of 

 widths of articles 2, 4, 5, 6 = 30:26:26:10. 



Peraeopod 4: article 4 as broad as in peraeopod 3, but much more 

 slender than the broad article 2, article 6 longer than 5. Ratio of widths 

 of articles 2, 4, 5, 6 = 41 :26:18:7. 



Peraeopod 5 : article 2 not broadly expanded, ratio of width to length 

 is 45:52, posterior edge with 3 large teeth increasing in size ventrally; 

 sweep point near distal end of article 3, lower edge dipping strongly 

 anteriorly, slightly convex; rest of appendage rather stout except for 

 article 6 which is narrow and not longer than article 5. 



Uropods stout. Uropod 1 : distal edge of peduncle with 2 stout spines, 

 rami shorter than peduncle, each with one stout marginal and one 

 terminal spine. 



Uropod 2 : peduncle with 4 stout marginal spines, rami shorter than 

 peduncle, inner ramus with a small marginal spine only, each ramus 

 with a terminal spine. 



Uropod 3 : inner ramus about one half as long as outer, article 2 of 

 outer ramus short, about one ninth as long as article 1. 



Telson slender, apices rounded, each with a lateral subterminal spine. 



Third epimeron : posterior edge nearly straight, lower corner quadrate 

 and slightly cuspate, posterior edge with 3-4 setae. 



Male. — With typical sexual dimorphism. 



Holotype. — AHF No. 4918, female, 6.5 mm. 



Type locality, — False Bay, San Juan Island, Aug. 13, 1949, coll. J. 

 W. Bee. 



Remarks. — This subspecies differs from the typical subspecies par- 

 ticularly in the narrower sixth articles of gnathopods 1-2 and in the 

 other criteria of Table 6. It may be simply an ecophenotype responding 

 to its bay environment in the same way that the San Quintin Bay forms 

 of P. heterocuspidatus do, by the narrower hands of the gnathopods and 

 other quantitative differences. The P. t. pallidus specimens also differ 

 from P. heterocuspidatus in the spination on the gastric mill (compare 

 Plate 38, fig. M and Plate 19, fig. Z). A study of this anatomy may 

 prove interesting from both a systematic and ecologic point of view. 



Material examined. — False Bay, San Juan Island, Puget Sound, 

 Washington: August 1948, coll. Dr. J. L. Mohr (4) ; August 13, 1949, 

 coll. J. W. Bee (33). 



Distribution. — Known only from Puget Sound, Washington. 



