16 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



shorter than others, but with lateral recurved extensions showing in 

 the dorsal view. Telson with squarish posterior edge with medial ridge 

 most of length of segment ending in medial spine. Other spines also 

 present along margins; medial spine longest, medial lateral spines 

 shorter and series of even shorter spines along the lateral edges of tel- 

 son. Peraeopods all ambulatory with many stout setae. Eight flagellar 

 articles on first antenna; 12 on second. First antenna extends to edge of 

 first peraeonal segment; second to edge of third. Maxilliped with two 

 large plumose setae on endite; many spines on segments of palp. Man- 

 dible with toothed incisor, small lacinia mobilis, and toothed molar proc- 

 ess. Palp with three articles and apical setae; second article also with 

 many setae. Uropodal base with produced inner angle; exopod about one- 

 half as wide as endopod, but not extending as far posteriorward. 

 Fringe of short plumose setae on margin on uropodal processes; telson 

 with some larger plumose setae. 



Measurements: Holotype female 3.0 mm long. 



Type locality: 6806; Santa Cruz Canyon; 218 m; Dec. 22, 1959, 

 rocks and some green sand. Lat. 33° 35' 59"N, Long. 119° 15' 11"W. 



Materials examined : 6805 ( 1 ) ; 6806 ( 3 ) . 



Distribution: Santa Cruz Canyon at 218 m. 



Affinities: The species can be distinguished from others of the genus 

 by the general configuration of the telson with its medial ridge and pat- 

 tern of spines, and by the recurved lateral extensions of the pleonal 

 segments. It can be distinguished from Cirolana harfordi from the 

 southern California maritime (Richardson, 1905) by the last pleonal 

 segment, the lateral edges of which are not visible in the dorsal view. 



GNATHIOIDEA 



GNATHIIDAE 



Gnathia Leach 



Gnathia crenulatifrons Monod 



Gnathia crenulatifrons Monod, 1926, pp. 390-393, figs. 154, 155. 

 Gnathia crenulatifrons Menzies and Barnard, 1959, pp. 27-29, fig. 22. 

 Gnathia crenulatifrons Schultz, 1964, p. 314. 



Materials examined: 2361(10); 2789(2); 3000(1); 3180(2); 

 6823 ( 1 ) ; 6832 ( 1 ) ; 7054 ( 6 ) ; 7 1 74 ( 9 ) . ( The numbers recorded are for 

 males only.) 



Distribution: Found within the depth and distribution ranges re- 

 corded by Menzies and Barnard ( 1959). 



