COPEPODA FROM IFALUK ATOLL 205 



somites 3 and 4. There are 2 more or less oblique rows of spinules 

 on sides of 1st, 2nd, and 3rd abdominal somites; in addition, there 

 are spinules on the ventral aspects of somites 3 and 4; the position of 

 all spinules appears from figures 77a, b. Somites 3 and 4 have about 

 the same length. Anal somite short, strongly telescoped into 4th, 

 with broadly rounded anal plate. Insertion of caudal rami bordered 

 with spinules. 



Furcal rami broader than long (proportion 3:2), with 5 marginal 

 setae and 1 appendicular seta. Setae 1 and 4 fine and short; seta 5 

 an acutely pointed spine. Setae 2 and 3 lengthened and thickened, 

 especially 3rd, reaching half length of body. Both setae are setose, 

 seta 3 swollen at base. Appendicular seta fairly long; spiniform seta, 

 inserting in extreme distal end of each ramus. 



Antennules % the length of cephalic somite, 8-segmented. Seg- 

 ment 4 with moderately developed conical process bearing aesthe- 

 tasc and 2 fine setae. Setation represented in figure 80a. 



Antenna (fig. 806) with well-developed exopodite, 3-segmented, 

 with 1, 1, and 3 setae respectively; all setae fairly strong. Endop- 

 odite carries total of 8 appendages, 3 or which ai'e geniculate setae. 

 Internal endopodal margin spinulose. 



Cutting edge of mandibular praecoxa damaged in my preparation, 

 but basipodite well developed, with 3 long setae. Exopodite present, 

 faintly 2-segmented, with 4 setae. Endopodite unsegmented, with 

 total of 7 setae: 2 lateral, 5 terminal (fig. 80c). 



Arthrite of maxillule (fig. 80d) moderately developed, with 9 seti- 

 form spines and haired seta. Coxa and basis each with distinct endite, 

 with 2 and 3 setae respectively. Exopodite small, with 2 setae; 

 endopodite unsegmented, \vith total of 4 setae. No epipodite. 



Maxilla (fig. 80e) with strongly developed basal endite, carrying 

 strong, curved spine and two setae. Praecoxa and coxa partly fused, 

 with total of 3 endites. Distal 2 endites with 3 spinulose, short 

 setae; remaining (proximal) endite with 4 setae. Endopodite small, 

 unsegmented, with 3 setae. 



MaxiUipede (fig. 80/) with short coxa, carrying 3 (and not 2 as 

 figured by Sars, 1906, pi. 91) setae on distal lobe. Basis with straight 

 internal border, with longitudinal row of fine hah-s and seta. External 

 margin moderately swollen. Endopodite unsegmented, forming 

 ciu-ved, acutely pointed claw, slightly shorter than basis. 2 addi- 

 tional setae on endopodite. 



Leg 1 (fig. 79a) with 3-segmented endopodites and exopodites. 

 Basis with spine at internal and external borders. 2nd exopodal 

 segment twice as long as broad and twice as long as segment 1, with 

 strong external spine and fine internal seta. 3rd exopodal segment 

 small, with total of 5 appendages. 1st endopodal segment styliform, 



