62 U.S. NATIONAL MUSEUM BULLETIN 278 



1947, p. 70.— Edmondson and Mansfield, 1948, pp. 206-207, fig. 3.— Stein- 

 berg and Dougherty, 1957, pp. 281-283, figs. 8-11, 13, 29.— McCain, 1965, 

 p. 192. 

 Hemiaegma quadripnndata Sundara Raj, 1927, pp. 12G-127, pi. 18. 



Diagnosis. — Since this genus is monotypic, the characters of the 

 genus are diagnostic for the species. 



Description. — Body smooth except for pair of ventral spines 

 between insertions of gnathopods 2. Length of largest male 4 mm, 

 female 3.2 mm, smallest ovigerous female 2.7 mm. 



Antenna 1 approximately length of pereonites 1-4. Antenna 2 

 slightly longer than peduncle of antenna 1. 



Left mandible with 5-toothed incisor, 5-toothed lacinia mobilis, 

 setal row absent, numerous setules present between molar and lacinia 

 mobilis. Eight mandible similar to left except lacinia mobilis apically 

 serrate instead of 5-toothed. Palp of maxilla 1 with 2 or 3 apical spines 

 and 1 seta, outer lobe mth 6 spines. Outer lobe of maxilla 2 with 

 4 or 5 apical setae, inner lobe with 3-5 apical setae. Outer lobe of 

 maxilliped with 2 apical setae, 1 seta near midlength of medial margin, 

 and larger specimens wdth 1 or 2 proximal setae on medial margin; 

 inner lobe with 2 setae and 1 smaU spine; dactylus of palp with 

 serrate grasping margin. 



Propodus of gnathopod 1 with 1 small proximal grasping spine 

 on medial surface and large proximal knob covered with small pro- 

 jections, dactylus not serrate on grasping margin. Propodus of 

 gnathopod 2 mth proximal grasping spine, distal notch with slightly 

 proximal spine, and distal bilobed tooth. 



Gills elliptical. 



Pereopods 3 and 4, 1 -segmented with 2 or 3 apical setae. Palm 

 of propodus of pereopods 5-7 concave with 5 or 6 proximal knobs, 

 each w^ith small spine. 



Abdomen of male and female with pair of biarticulate appendages, 

 dorsal lobe bilobed. 



Distribution. — Type-locality: Off Amoy, China, at a depth of 

 15-46 m. 



Other records: Off Virginia; Port Aransas, Texas; Oahu, Hawaii, 

 Tateyama, Honshu, Japan; 1°42.5' S., 130°47.5' E.; region of Fre- 

 mantle, Austraha; Krudadai Island, India; South Arabian coast. 



New records: Several localities near Bermuda; off Cape Hatteras, 

 N.C.; Elliot Key, Fla.; Loggerhead Key, Tortugas; 29°44' N., 88° 

 23.5' W.; St. John, Virgin Islands; False Bay, South Africa; Bora 

 Bora. 



Remarks. — This species is easily identified by the unusual hex- 

 agonal outhne of the pereonites when viewed dorsally. When viewed 

 in this position the gnathopods 1 are usually held in a posteriorly 



