16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



of these females has been designated as the holotype (USNM 

 112870), the others as paratypes (USNM 112869). 

 Measurements.^ — (In mm) 10 females: 



Greatest length of body 



Length of cephalothorax 



Width of cephalothorax 



Length of trunk 



Width of trunk 



Length of egg strings (5 strings) 



Description of female. — Body (fig. 6a) divisible into two regions, 

 Cephalothorax, including cephalon and maxilliped-bearing thoracic 

 segment, forming first region, pedigeroiis segments and genital segment 

 forming second. Cephalothorax of general ovoid shape, margins 

 slightly irregular. Anterior dorsal region of cephalothorax heavily 

 sclerotized, with cross-shaped region of sclerotization extending pos- 

 teriorly on median dorsal surface to middle of cephalothorax although 

 fine line of heavy sclerotization extending posteriorly to posterior- 

 median dorsal surface. Second region composed of fused pedigerous 

 and genital segments, constricted anteriorly into necklike connection 

 with cephalothorax, constriction composed anteriorly of 2 dorsally 

 fused pedigerous segments. Posterior two-thirds of second region 

 tapered in some specimens to posterior end although shape variable, 

 depending at least partially on number of eggs in genital segment. 

 Posterior lateral and posterior ventral surfaces of second region irregu- 

 lar, knobby, knobs forifiing margin of oviducal openings and more 

 apparent in ovigerous females. Posterior end rounded, projecting past 

 oviducal openings in some specimens, bearing knoblike caudal rami on 

 lateral ventral siu-face. Caudal rami (fig. 66) small, each tipped 

 by 2 small setules. 



Antennule (fig. 6c) 6-segmented, strongly compressed. First 

 segment with 6 irregular naked setae from ventral margin; second 

 segment with 3 setae; third w^ith 1 from ventral margin, 1 from distal, 

 and third from dorsal surface; fom'th segment naked; fifth with one 

 seta from dorsal surface; sixth with 7 setules distally. Antenna (fig. 

 Qd) 2- or 3-segmented, basalmost portion squat and irregular, segment- 

 like but questionable, with several knoblike articulation siu"faces 

 received by proximal end of penultimate segment. Penultimate 



Figure 6. — Hatschekia breviramus, new species, female; a, dorsal view; ^, posterior region, 

 left side showing caudal ramus (r) and anal indentation (a); c, right antennule, anterior 

 view; d, left antenna, ventral view; e, membrane-like flap at base of antenna, ventral view; 

 /, oral region, left side showing mouth cone, mandible (mdbl), and maxillule (ma); g, oral 

 region showing mouth cone, mandible, maxilla?, antenna base (a-2), and maxilliped base 

 (mxpd); h, maxilliped, ventral view; i, distal end of maxilliped, ventral view. 



