468 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



end; the terminal claw is pectinate. The two digits of the chela of 

 the maxillipeds are about the same length, and each is 2-segmented. 

 The end segments are enlarged; the one on the movable digit is 

 spherical and fits inside the other, which is bowl-shaped. 



The first legs are covered with spines on the ventral surface, the 

 exopod is 3-segmented, the endopod 1-segmented, with a single apical 

 seta and a row of teeth along its inner margin. The rami of the 

 second and third legs are 3-segmented; the second exopod is consid- 

 erably lengthened and modified for prehension. The exopod of the 

 fourth leg is 3-segmented, while the endopod is a huge spine, much 

 longer and stouter than the exopod; the fifth legs are large 1-seg- 

 mented laminae, each tipped with a single seta. Total length, 

 1.5-1.7 mm. Width of fourth segment, 0.35 mm. Length of ovisacs, 

 0.7 mm. 



Male. — Unlmown. 



Remarks. — This species is so hidden between the gill filaments that 

 it is easily overlooked, and this is probably one reason why it has 

 not been found before. Its most prominent single character is the 

 huge endopod spine of the fourth legs. 



EUDACTYLINODES, new genus 



Female. — Head fused with first segment; four free thorax seg- 

 ments without dorsal plates; fifth segment nearly twice as long as 

 wide; genital segment smaller than the fifth segment, the oviduct 

 openings dorso-lateral ; abdomen 2- or 1-segmented, conical; caudal 

 rami minute, as wide as long. First antennae indistinctly segmented, 

 but apparently made up of eight segments, the second segment with 

 long stout claws, a broad lamina, or spines, the end segment with an 

 apical tuft of spines. Second antenna 3-segmented, uncinate; first 

 maxilla a single dactylose process, with two apical plumose setae. 

 Maxillipeds huge and horizontal, uniramose, made up of a stout 

 basal segment and a terminal portion indistinctly 3-segmented; the 

 latter is longer than the basal segment, elliptically curved, and shuts 

 down against the basal portion. All four pairs of legs biramose, 

 rami 3-segmented, the segmentation often indistinct; fifth legs 

 dactylose, uniramose, 1-segmented, invisible dorsally. Eggs few in 

 number, large and scarcely flattened. 



Male. — Head fused with first segment and the widest part of the 

 body; four free segments diminishing in length and width back- 

 ward; genital segment wider than fourth segment and nearly twice 

 as long as wide, narrowed posteriorly. Abdomen 4-segmented, the 

 segments diminishing in size distally; caudal rami elongate. First 

 antenna 8-segmented, armed as in the female; maxillipeds uncinate 

 and not like those of the female. First four pairs of legs biramose, 

 rami 3-segmented, all three segments of both rami armed with setae; 



