26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



insertion in the notopodium, but there are no lateral teeth or spinelets. 

 The inferiormost notopodial setae are nearly smooth (pi. 2, fig. 30). 



Posterior parapodia are essentially like those in the median region 

 of the body, except that they are smaller, and the neuropodial setae 

 have as many as 2 or 3 lateral spurs (pi. 2, figs. 23, 24). 



Elytra 15 pairs, white, translucent, their point of attachment at the 

 external margin (pi. 2, fig. 17), their surface covered over with many 

 globular to elongate papillae, most crowded near the elytrophore (pi. 

 2, fig. 25) and somewhat dispersed near the distal margin. The papillae 

 resemble those on the notopodium but are more flattened, merging into 

 the surface of the elytrum. 



The character of the prostomium with its ocular prominences, the 

 kind of neuropodial setae and the elytra identify this species with the 

 genus Pontogenia. It lacks, however, the harpoon-like and scimitar-like 

 setae characteristic of most of the species of this genus. They are re- 

 placed by notopodial setae that are almost smooth except for minute 

 asperities. 



This is the first record, to my knowledge, of this genus from the 

 eastern Pacific. Several species (P. curva Chamberlin, P. maggiae 

 Augener, and P. sericoma Ehlers) have been described from the Gulf 

 of Mexico and the West Indian region, but from each of these P. 

 laevtseta differs most notably in its setigerous structures. 



Holotype. — AHF no. 2. 



Distribution. — Bahia Honda, Panama (type) ; Secas Islands, 

 Panama; Isabel Island, Mexico; Angel de la Guardia Island, Lower 

 California, Mexico. Shore to 80 fms. 



