NO. 3 BARNARD: THE PHOXOCEPHALIDAE 281 



(=sinuata) . Undoubtedly direct comparison of specimens with the type 

 of P. villosus would reveal additional differences. 



(1) gnathopod 1: ratio of articles 5-6: villosus = 6:5; P. sinua- 

 tus = 7 :8. Article 6 has parallel edges in P. sinuatus and expanded-con- 

 vex edges in P. villosus. 



(2) peraeopod 3: article 4 is as wide as article 2 in P. villosus but 

 only two thirds as wide as article 2 in P. sinuatus. 



(3) peraeopod 5, article 2: posterior edge in P. sinuatus has sparse 

 serrations with short setae, while Dr. Sheard states that in P. villosus 

 the posterior edge has fine crenulations and long setae. 



(4) uropod 1 peduncle: the spines are of different sizes on the 

 outer and inner edges in P. sinuatus while they are of similar size, and 

 less numerous, in P. villosus. 



(5) uropod 2, inner ramus: spines present on P. sinuatus and absent 

 in P. villosus. 



Other relationships. — Paraphoxus sinuatus is quite similar super- 

 ficially to P. obtusidens from Pacific North America but differs in the 

 following ways: 



(1) uropod 1, outer ramus: the entire length is lined with small 

 spines, while in P. obtusidens they occur only proximally. 



(2) uropod 2: the inner ramus lacks spines in P. obtusidens. The 

 spination of the rami of uropods 1-2 is distinctly different (see above 

 remarks) than in P. obtusidens. 



(3) the head is broader vnd flatter and somewhat demarcated in 

 front of the eyes (in this way similar to P. obtusidens major). 



(4) third epimeron: the sweeping edge below the lower corner 

 is never as pronounced in P. sinuatus as in those forms of P. obtusidens 

 which are similar. 



(5) the telson is broader and armed differently in the two species. 

 Abnormal specimens. — The enlarged figures of the gnathopods 



shown herein are of another specimen (Swedish Museum Cat. No. 

 2741 ) and show somewhat broader hands than normal. 



A presumed juvenile included in Cat. No. 3639 (SSM) had a 

 rather convex posterior edge on the third epimeron above the lower 

 corner and the lower edge curved up broadly to meet the lower corner. 

 The outer rami of uropods 1 and 2 had 4-5 and 2-3 rather large spines 

 respectively, instead of relatively numerous small spines in the adults. 

 Development in this species should be studied more intensively to verify 

 juvenile and adult differences. 



