178 



CALIFORNIA ACADEMY OF SCIENCES 



319. Evermannia zosterura {Jordan d- Gilbert). 



Seven specimens were secured from the tide-pools of the Panama reef, where 

 it was associated with the much more numerous U. ■pannmensif^. The species had 

 been detected heretofore only at Mazatlan, Mex. In the Panama specimens, the 

 normal fin-formula is D. IV, 14-f 1; A. 13+1. One specimen only varies from this 

 in having the anal rays 14+1. In seven additional specimens from Mazatlan no 

 variation exists. 



U. zosterura agrees with U. panamensis in having a rather long flexible 

 appendage to the shoulder-girdle, and in the presence of embedded scales; though both 

 characters are denied in all published descriptions. The scales are very few in number, 

 and can be detected only by the examination of detached portions of the skin under 

 high magnification. There are thus no characters remaining to separate Evermannia 

 from Ilypnus, save that the latter has five instead of four dorsal spines, with none 

 of them filamentous or produced; the scales are also regularly arranged and are not 

 concealed. These characters seem doubtfully sufficient for generic division, but the 

 groups may be provisionally retained pending further examination of allied species. 

 C/evelandia is somewhat less closely related. It is said to have no fleshy appendages 

 to the shoulder-girdle, but in 0. ios, which we have re-examined, there is an evident 

 low sharp crest along the lower portion of the girdle, rising at about two points to 

 form inconspicuous papillae. This condition is quite difforent from that obtaining in 

 Evermannia and Jlyjmus, where a single long flexible finger-like process arises from 

 the same locality in all of the species. 



Measurements in Hundredths of Length without Caudal. 



Length of body in mm 



Length of head 



Length of snout 



Length of maxillary 



Diameter of orbit 



Depth of body at ventral base 



Distance from snout to spinous dorsal 



Base of second dorsal... 



Distance from snout to anal 



Base of anal 



Length of pectoral fin 



Length of ventral fin 



Length of caudal fin 



