230 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Basal segment of antennule large, produced anteriorly to fill notch 

 between frontal lobe and inner orbital angle; anterior face flat, with- 

 out spines or other projections. 



Chelipeds short and stout; manus weak, flattened. Walking legs 

 short and stout; propodus (apparently) without movable spinules on 

 posterior margin; dactylus ending in a simple spine, with rudimentary, 

 movable accessory spinules on posterior margin. 



Telson of abdomen composed of seven plates. 



Contains a single species. 



Remarks: Glassell's description of the structure of the antennae in 

 Ulloaia is not clear and may have been a typographical error: "First 

 antennal peduncle removed from the eye, not joining the margin of the 

 carapace" (1938a, p. 434). In reality, the antennal peduncle is removed 

 from the eye by the strongly produced basal segment, which joins the 

 margin of the carapace. Chace (1942, p. 101), who had not seen a speci- 

 men, misinterpreted Glassell's statement and in his key to the porcel- 

 lanid genera placed Ulloaia among the forms with basal antennal seg- 

 ment small and movable segments having free access to the orbit. 



Ulloaia perpusillia Glassell 

 Plate 37, fig. 2; text-fig. 11 



Ulloaia perpusillia Glassell, 1938a, p. 434, pi. 33, fig. 1 (type locality, 

 Punta Penasco, Sonora, Gulf of California). 



Previous records: Gulf of California. Punta Penasco, Sonora: S. A. 

 Glassell (Glassell). 



Diagnosis: Carapace a little longer than broad, lateral margins 

 gradually and evenly diverging from hepatic to mid-branchial regions; 

 surface covered with large granular protuberances; front appearing 

 quadridentate in dorsal view, the two median teeth being on the outer 

 margins of a large, rectangular rostral process, the latter sharply de- 

 flexed and visible only in frontal view; chelipeds roughly granular, 

 manus weak, covered with long plumose hairs; walking legs short and 

 stout, merus with a long, curved posterodistal process. 



Description: Carapace a little longer than broad, lateral margins 

 gradually and evenly diverging from hepatic to mid-branchial regions, 

 epibranchial angle marked only by a small notch ; surface uneven, cov- 

 ered with large protuberances, these protuberances lacking only on in- 

 testinal regions; latter regions, and grooves defining the swollen areas, 



