NO. 2 WALTON : THE GENUS PYLOPAGURUS 147 



Pereiopods equally developed on both sides; merus smooth, com- 

 pressed, superior and inferior margins with line of tufted setae; carpus 

 has single, small, hooked spine medially on superior surface; propodus 

 almost one-fourth longer than dactyl; dactyl spinulose on superior and 

 inferior margins, setose, tipped with sharp curved, horny claw. 



Fourth pair of thoracic legs subchelate, rasp restricted to small area 

 on face of propodus; fifth pair longer than fourth, rasp covering one-half 

 of propodus and the minute dactyl and pollex. 



Abdomen short, obese, terga not present except in caudal shield; 

 anterior tergum in shield separate, larger, smooth, anterolateral corners 

 rounded; posterior tergum with posterolateral corners produced into 

 bluntly triangular lobes equipped with long setae. 



Telson symmetrical, semioval, smooth, margins entire; uropodal 

 blades equally developed on both sides, rasp covering narrow crescentic 

 area on upper distal face, posterior blade reduced, barely exceeding base 

 of anterior blade, rasp covering almost all upper surface. 



Distribution: Previously known only from the type locality near 

 San Jose Point, Baja California, in 45 fathoms (Glassell 1937). 



Specimens in the Hancock collections are from Point Hueneme, 

 Santa Cruz Island, Santa Rosa Island, Seal Beach, Santa Barbara Island, 

 Santa Catalina Island, San Clemente Island, and San Diego, California; 

 Cortes Bank, Guadalupe Island, and Cedros Island, Baja California, 

 and east of Angel de la Guardia Island, Gulf of California, Mexico. 



The bathymetric range was from 11 to 150 fathoms. 



The Hueneme locality at 34°05'30" N. Latitude, 119°02'40" W. 

 Longitude now represents the northernmost report of the occurrence of 

 the species and the Cedros Island station at 28°05'50" N. Latitude, 

 115°31'00" W. Longitude the southernmost report. The Angel de la 

 Guardia Island locality is the only report of the species from the Gulf 

 of California. 



Remarks: Two female specimens were without the paired ab- 

 dominal appendages characteristic of the genus. Both were infected with 

 (what the writer believes to be) rhizocephalan parasites and the lack of 

 these appendages is therefore presumed to be the result of parasitic 

 castration with suppression of secondary sexual characteristics. 



