﻿248 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 102 



teristically branched in each species. Curved chitin rods, sometimes 

 armed with spines or spinous processes, between bases of legs 1 and 

 2. Leg 2 with trimerous rami ; outer spines of exopod 1 and 2 only 

 moderately developed ; endopod 1 and 2 with outer marginal laminae. 



Leg 3 having both rami 3-segmented, their bases set closely together. 

 Exopod well developed, the first segment elongate as in the second leg, 

 outer spines weaker. Endopod 1 and 2 with outer laminae, that of 

 segment 1 greatly enlarged and overlying the exopod, that of seg- 

 ment 2 much smaller ; the second segment the longest, with two inner 

 setae arranged like those of the second leg; third segment approxi- 

 mately the same size as the first segment, with four terminal setae. 



Leg 4 uniramose and stout ; 4-segmented, the basal segment greatly 

 broadened; somewhat sexually dimorphic in armature; some species 

 having short spines on the inner margins of segments 2-4 ; the sutures 

 between these segments transverse. No rudiments of legs 5 and 6 

 visible on genital segment of adult, but present on the ventral side in 

 female chalimi ; condition in immature male not observed. 



Length of known females, 6-15 mm. ; of males, 4.8-12 mm. 



Parasites of giant rays. 



Genotype. — Pupulina -fiores P. J. van Beneden. 



PUPULINA FLORES van Beneden, new description 



Plate 12 ; Plate 14, Figtxres 8-11 



PupuUria fiores van Beneden, 1892, p. 254, pi. 3, figs. 6-8, female. 



Lepeophtheirus fiores, Bassett-Smith, 1899, p. 455. 



Lepeophtheirus fiores, C. B. Wilson, 1905, pp. 617, 618, in key. 



Ptipulina fiores, C. B. Wilson, 1935a, p. 594, figs. 1-13, female and male. 



Pupulina fiores, C. B. Wilson, 1935b, p. 331, refers van Beneden's male to Para- 



leMon elongatus female. 

 Pupulina fiores, Beee, 1936, p. 590, the "large female." 



Specimens examined, — Six mature, two immature females ; two ma- 

 ture males, U.S.N.M. No. 60439. Host: Mania birostris (Walbaum). 

 Locality : near the Galapagos Islands. Identified by Charles Branch 

 Wilson. 



One female, U.S.N.M. No. 79150. Host: "probably Mohula hypos- 

 toma (Bancroft)." Locality: Lemon Bay, Fla., Gulf of Mexico. 

 Identified by Ruby Bere. 



Diagnosis. — Anterior (cephalothorax) and posterior parts of body 

 approximately equal in length in both sexes. Processes of female 

 genital segment reaching a little beyond the middle of the abdomen. 

 Caudal rami attached terminally, linear ; those of female only a little 

 shorter than the abdomen ; those of male longer. Outer chitin piece 

 of first maxilla extended distally almost to tip of the process of the 

 inner piece; the latter bifurcate in male. Maxilliped of male with 

 a short papillalike process on the basal segment. Posterior ventral 



