NO. 2149. JAPANEiiE MACROUROID FISHES— GILBERT AND HUBBS. 173 



13. COELORHYNCHUS JORDANI Smith and Pope. 



Coelorhynchus jordani Smith and Pope, Proc. U. S. Nat. Miis., vol. 31, 1906, 

 p. 494, fig. 11. 



This species is very closely related to C. khhlnouijei, and appears 

 to represent that form in Kagoshima Gulf and Eastern Sea. C. 

 Mshinouyei is known only from Suriiga Gulf and Sagami Bay. 



C. jordani is the smaller form, and differs constantly from C. 

 Mshinouyei in a number of details, as follows : 



1. The absence of the naked thoracic fossa between the ventrals. 

 (A gland-like body is located in the muscles betw^een the ventral fins, 

 similar to that found beneath the fossa in Ahyssicola macrochir.) 



2. The orbit much smaller in the adult, apparently decreasing more 

 rapidly with age, being shorter instead of longer than the postorbital 

 length of the head. 



3. The longer barbel. 



4. The pectoral fin shorter and narrower; its rays weaker and 

 fewer, 14 or 15, instead of 17, as constantly found in C. kishinouijei. 



5. The ventral fin usually shorter. 



6. The scales on the head, especially on the ridges, much smoother 

 and more regularly imbricate ; the scales between the occipital ridges 

 not in the three definite rows characteristic of C. Mshinouyei; scales 

 otherwise similar in the two species. 



7. The posterior margin of the preopercular ridge, and of the sub- 

 opercle, more strongly curved. 



8. The backward projection of the subopercle, its lower angle 

 longer and slenderer. 



9. Pyloric caeca more numerous, slenderer, and shorter, about half 

 as long as the orbit, numbering in the six specimens counted : 25, 26, 

 28, 29, 31, 31. 



10. Coloration agreeing in almost every detail, but generally 

 lighter ; the posterior of the two spots on the body absent in all but 

 one young specimen, the anterior spot in the same position, but much 

 more indistinct, and much narrower, covering only 2 or 3, in- 

 stead of about 6 scale-rows. The outer ventral ray white, the black- 

 ish base overlaid with gray, the rays not lighter in the middle than 

 at their distal ends. 



