COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 231 



Text-fig. 11. Ulloaia perpusillia. 1, Frontal view of carapace, x 19; 2, Basal seg- 

 ment of right antennule, x 51. 



punctate ; upper surfaces of protuberances with numerous small scattered 

 granules; a low, median longitudinal ridge extending length of cara- 

 pace; lateral margins with a row of strongly granular lobes or blunt 

 teeth, posterior ones largest. Surface lightly pubescent. Front quadri- 

 dentate in dorsal view, the two median teeth broad, triangular, formed 

 by outer rolling edges of the sharply deflexed rostral process, latter not 

 visible from above; lateral teeth the strongly produced, triangular inner 

 orbital angles. In frontal view, the deflexed rostral process broad, rec- 

 tangular, separated by broad, deep triangular notches from inner orbital 

 angles; these spaces completely filled by anterior faces of basal anten- 

 nular segments. Eyes visible in dorsal view; outer orbital angles slightly 

 produced. 



Movable segments of antenna more or less smooth ; flagellum a little 

 over half carapace width, with long, sparse hairs. Outer maxillipeds 

 lightly punctate. 



Chelipeds covered with large, rough granules, some of them produced 

 into spinules. Merus with a strongly projecting lobe on anterior margin. 

 Carpus slightly longer than wide, armed on anterior margin with a 

 median lobe or broad tooth; surface uneven, with two longitudinal 

 grooves. Manus less uneven than carpus; outer margin with long plu- 

 mose hairs. Gape of fingers with a long tuft of plumose hairs, similar 

 hairs also covering the ventral surface of the manus. 



Walking legs roughly granular to spinulate as in chelipeds, covered 

 with long plumose hairs. Merus with a long, curved posterodistal proc- 

 ess. 



Variations: The female specimen from Costa Rica (see Material Ex- 

 amined) differed in some respects from the male holotype. The pro- 

 tuberances covering the carapace were less distinct, as were the grooves 

 defining them; the median longitudinal ridge on the carapace was 



