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U. S. P. R. E. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



left, from the frontal region to the base of the caudal fin, approximating closely to the dorsal. 

 A second series originates at the nostrils, passes beneath the eye, sends downwards a post-ocular 

 branch, proceeds along the tympanic region sending off a preopercular branch, then onwards 

 along the upper edge of the opercle and middle region of the back to the base of the caudal. A 

 third series proceeds from the symphysis of the dentary (lower jaw) to the opercular apparatus, 

 where it bifurcates, one branch following the inferior edge of the sub-opercle, the other branch 

 the inferior edge of the opercle. A fourth series extends from the throat to the branchiostegal 

 apparatus. A fifth series originates immediately behind the preceding one and extends within 

 the base of the ventrals, hence diverges towards the chest after sending a recurrent branch 

 outside of the insertion of the ventrals and another to the base of the pectorals, posteriorly to 

 which it still ascends a little, meets with the series from behind the pectorals, and following 

 the inferior middle region of the body terminates before it reaches the caudal fin. Finally, 

 a sixth series begins under the thorax and extends to the base of the caudal, approximating 

 closely the anal fin. 



The color of the upper region of the hea I and body is dark bluish violet ; the sides and the 

 belly being occasionally silvery grey, at others simply lighter than on the back. There is a 

 sub-crescentic dark vitta beneath the eye, and each pore reflects a golden dot. 



References to the figures. Plate XXV, fig. 1, represents Porichthys notatus, size of life, from 

 the bay of San Francisco, California ; figure 2, an inferior view of the entire fish ; figure 3 is a 

 side view of the head ; figure 4, an upper view of the same ; figure 5, a pectoral fin ; figure 6, 

 a ventral fin. The bifurcations of the two inner rays were taken by the artist for independent 

 rays, hence the fact of five instead of three being represented in this figure. The series of pores 

 are not fully represented. 



List of specimens. 



