346 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



("rough hand") refers to it; the terminal hook is armed midway 

 with a strong, sharp spine, which rests against a nodule on the 

 preceding segment, which is also armed with two short sharp 

 spines near the tip of the hook. Furcula slender with the arms 

 diverging very little, invested anteriorly with tripartite sharp- 

 pointed cap. 



First leg uniramous, with a broad basal joint, which bears two 

 rows of spinules anteriorly, and a pair of short, sharp spines on 

 the posterior-lateral angle; second segment slender, tapering, 

 spinulose distally; terminal segment bears three hooks and four 

 plumose setae. Second leg biramous, basal segment twice as long 

 as wide ; exopod 3-segmented, proximal segment with two spines 

 and two plumose setae ; endopod 3-segmented, with one, three, and 

 six plumose setae. Third leg lamellate, biramous; base with a 

 strong hook; exopod 2-segmented; proximal segment with ai 

 crinkled border and two and four curved plumose setae ; endopod 

 biramous, distal segment with a spine and six plumose setae. 

 Fourth leg 4-segmented, with five spines. Fifth leg represented by 

 three small spines on the genital segment. 



Measurements : Body length 3.3 mm. ; width of carapace 1.9 mm. 



Male. — Similar to female, but the endopod of third leg is longer. 



Types.— Female, U.S.N.M. No. 88563 ; male, U.S.N.M. No. 88562. 



Remarks. — This species differs from Caligus bonito Wilsoni 

 (1905), which appears to be closest to it, in the armature of the; 

 maxilliped, particularly the rough palm, the character of the fur- 

 cula, and the shape of the genital segment. 



CALIGUS SPINOSURCULUS, new species 



Figure 69, a^c 



Female. — Carapace orbicular, slightly wider than long (1.78 by^ 

 1.6 mm.) ; with a spinous suckerlike organ (fig. 69, c) on each side? 

 at the posterior end, and for this character the species is named ; ; 

 carapace less than half the total length (1.6-3.4 mm.). Genital 1 

 segment oval and slightly bilobed posteriorly. Abdomen 1-seg- 

 mented, rectangular, slightly curved on sides; about one-fourthi 

 as long as the genital segment (0.32-1.12 mm.) ; about two-thirds? 

 as wide as long (0.22-0.32 mm). Anal sinus not deep, a smalll 

 papilla on either side of it, and lateral to these five or six setae. ^ 

 The caudal rami are short, less than one-fourth as long as abdoH 

 men ; armed with four plumose setae. j 



Lunules shallow and small; first antennae not prominent; ter- 

 minal segment slender. Second antenna small and slender ; middle 

 segment spinulose. First maxilla with a small medial spine near 

 its middle, two setae at base. Second maxilla slender, terminated. 



