292 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



TOL. 46. 



space is contained 3^ to 3^ times in the head. The opercle is faintly 

 marked by two series of concentric rings, the upper overlapping and 

 obliterating the lower. The gill rakers number 12 or 13 + 30 and the 

 longest one is contained If times in the e3^e. 



The depth, in the length without caudal, is 5 to 6 times. The 

 depth of the caudal peduncle is contained 3J times in the length of 

 the head. The number of scales along median line of back, from 

 occipital region to caudal, is from 63 to 67. 



The fin rays number: Pectoral, 11; ventral, 8; dorsal, 10 or 11; 

 anal, 18 to 20. The pectoral is contained seven-eighths time in the 

 head; the ventrals, 1^ times; the dorsal, 1^; the anal, 1§; and the 

 caudal, 1|. All of the fins are longer, comparatively, than in either 

 of the other two species. The distance of the dorsal from the tip of 

 the snout is one-half the total length without caudal. The distance 

 of the insertion of the ventrals from the chin is equal to the distance 

 of the dorsal from the tip of the snout. The pectoral extends to or 

 slightly beyond the origin of the ventrals. The ventrals reach to or 

 slightly beyond the vent. The distance between the posterior 

 insertion of the dorsal and the insertion of the adipose dorsal is a 

 little less than the length of the head, greater than in Osmerus starJcsi 

 or Osmerus attenuatus. The distance between the origin of the 

 pectoral and the origin of the ventrals is equal to the length of the 

 head. The anterior origin of the ventrals is two-thirds of the diameter 

 of the eye in front of the anterior origin of the dorsal. The tip of the 

 dorsal extends not quite to a point opposite the origin of the anal. 

 The adipose dorsal is inserted slightly anterior to the posterior origin 

 of the anal. 



Here described from 10 specimens obtained in the market in San 

 Francisco, California. 



Measurements nf Osmerus thakichihys. 



Total length of body in mm 



Length of body without caudal in mm. 



Depth of body in hundredths of length 

 without caudal 



Depth of caudal peduncle 



Length of head 



Longitudinal diameter of eye 



Interorbital width 



Length of maxillary 



Length of snout to tip of upper jaw. . . . 



Lengtfa of lower jaw 



Length of i)ec*oral 



Length of ventrals 



Longest dorsal ray 



Longest anal ray 



Longest caudal ray 



Distance of dorsal from tip of snout. . . . 



Distance of ventral from chin 



Distance from tip of lower jaw to adi- 

 pose fin 



Distance from origin of pectoral to 

 origin of ventrals 



Number of dorsal rays 



Number of anal rays" 



Scales in longitudinal series above 

 lateral line 



Gill rakers on first gill arch 



Sex 



13-f-30 



Fe- 

 male. 



