1884 Bulletin:].'/, United States National Museum. 



z'. Spinous dorsal wholly hidden in the skin ; bones of head not greatly cavernous ; 

 lower jaw (J-shaped, its rami widely separated. Pstcheolutes, 756. 



zz'. Spinous dorsal evident, the spines not wholly hidden; bones of head cavern- 

 ous; lower jaw long, (J -shaped, its rami approximate at base. 



GiLBERTINA, 757. 



703. JORDANIA, Stalks. 



Jordania, Stahks, Proc. Ac. Nat. Sci. Phila. 1895, 410 {zonopc). 



Body elongate, not greatly compressed ; head moderate, partly scaled, 

 with dermal flaps abo^e; mouth moderate, with Lands of villiform teeth 

 on jaws, vomer, and palatines; body above lateial line closely covered 

 with strongly ctenoid scales; lower half of bodj^ with plate-like folds of 

 skin, running obliquely downward and backward from lateral line to 

 within a short distance of anal tin, the posterior edge of each fold finely 

 and sharply serrate; gill membranes united, free from isthmus; a slit 

 behind last gill arch. Three preopercular spines, only the middle one well 

 developed. Spinous dorsal with a very long base, of about 17 spines, 

 longer than the soft dorsal ; anal long; ventrals I, 5, inserted much behind 

 pectorals. Vertebra^ 10 -{-36 ^46. One species; in waters of moderate 

 depth; a singular gi'nus, approximating the IIcja(j7-ammidw. ("I take 

 great pleasure in naming this remarkable genus for my teacher in ichthy- 

 ology, David Starr Jordan." Starks.) 



22fi7. J0BDAXI.4 ZONOPE, Starks. 



HeadSi; depth 54^. D. XVII, 15; A. 22; pores in lateral lino 50; orbit 

 3| in head; maxillary 3i; longest dorsal spine 1§; longest dorsal ray 2^; 

 longest anal ray 2^; length of ventrals 1|; pectorals I longer than head; 

 caudal l*. Body rather elongate, comjirr'ssed posteriorly, not much, if 

 any, anteriorly; the back not elevated; dorsal and ventral outlines almost 

 straight from head to caudal peduncle; head not large, profile from front 

 of dorsal to eyes nearly horizontal and straight, then abruptly turning 

 steeply downward to end of snout; lower profile gently curved from chin 

 to ventral fins; mouth small, the maxillary not reaching the vertical from 

 front of orbit; jaws about equal, or the lower slightly projecting; teeth 

 in villiform bands on jaws, vomer, and jjalatines; eyes large, set high in 

 head, a little shorter than snout; interorbital space deeply concave, i as 

 wide as eye; a slip of skin, i as long as the diameter of the eye, over the 

 anterior edge of each eye, and a longer one over the posterior edge; a few 

 minute fleshy .slips on nape ; nasal spines long and sharp, somewhat curved 

 back; spine on preopercle simple, hooked up, a minute spine above it and 

 a blunt spine below; posterior end of opercle prominent, forming a blunt 

 spine ; opercle produced posteriorly in a flap, which lies in a shallow groove 

 in the shoulder girdle; no opercular spine ; gill membranes united, but 

 not joined to tbe isthmus ; a distinct slit behind fourth gill arch ; branchi- 

 ostegals 5. Top of head to middle of eyes, opercles, and uj)per part of 

 preopercles closely covered with small rough scales, head otherwise 

 naked; body above lateral line completely covered with ctenoid scales, 



