Jordan and Evermajin. — Fishes of North America. 1505 



of color not definite. Length 1 foot. Vancouver Island to Todos Santos 

 Bay, generally common ; the most abundant of the larger species south- 

 ward. (Named for A. C. Jackson, of Ban Francisco, who first noticed the 

 viviparity of Emhiotoca and first brought tbe fact to the attention of 

 Professor Agassiz.*) 



Emhiotoca jacksoni, Agassiz, Amer. Joi.ni. Sci. Arts 1853, 387, and 1854, 366, San Fran- 

 cisco; GiRARD, U. S.Pac. R. R. Surv., x. Fishes, 168. 

 Holconotus fuliguiosus, Gibbons, Proc. Ac. Nat. Sci. Phila. 1854, 123, San Francisco. 

 Emhiotoca cassidyi, Gieard, Proc. Ac. Nat. Sci. Phila. 1854, 151, San Diego. 

 Emhiotoca webhi, Girard, Proc. Ac. Nat. Sci. Phila. 1855, 320, San Diego. 

 Ditrema jacksoni, GtJNTHER, Cat., iv, 245; Jordan & Gilbert, Synopsis, 595. 

 Emhiotoca jacksoni, Eigenmann & Ulkey, I.e., 392. 



6o8. T^NIOTOCA, Alexander Agassiz. 



Holconotus, Gibbons, Proc. Ac. Nat. Sci. Phila., July, 1854, 122 (agassizii=lateralis). 

 Tceniotoca, Alexander Agassiz, Proc. Best. Soc. Nat. Hist., viii, 1861, 133 (lateralis). 



This genus is very close to Phancrodon, differing only in the short, deep 

 caudal peduncle. The single species is highly variegated in color. 

 {raivia, band; rona, iov Emhiotoca). 



1891. T.EMOTOCA LATERALIS (Agassiz). 



(Blue Perch ; Striped Surf-fish.) 



D. X or XI, 23 ; A. Ill, 31 ; scales 7-63-15 ; vertel)r<T 35 to 37. Body oblong, 

 compressed, with a short and very high caudal peduncle, the body taper- 

 ing back less than usual, the dorsal and ventral outlines nearly equally 

 curved. Mouth but little oblique, the maxillary scarcely reaching orbit. 

 Teeth strong; gill rakers short and stout, about 14 below angle. Spinous 

 dorsal very low, the last spine highest, but much shorter than the soft 

 rays; soft dorsal and anal high; pectoral fins triangular in outline to tips 

 of ventrals, which reach to vent ; origin of ventral spine about 2 scales 

 behind the vertical from posterior end of pectoral base; third anal spin© 

 less than ^ as long as first rays. Color reddish olive above, becoming 

 bright orange red below, everywhere thickly dusted with black points; 

 a continuous bright blue streak along the edges of each row of scales; 

 streaks of thoracic region formed by isolated blue spots on the middle of 

 the scales ; head with several series of blue spots and streaks ; fins all 

 olivaceous dusky ; ventrals witli some light orange. Vancouver Island to 

 San Diego ; very abundant northward, scarce south of Point Conception ; 

 a very handsome fish, {lateralis, pertaining to the side.) 



'The date of Dr. Jackson's discovery is June 7, 1852. Dr. Thomas H. Webh, of the 

 Mexican Boundary Survey, soon after sent a similar notice to Agassiz, an extract from 

 his diary at San Diego, May 3, 1852. Dr. J. K. Lord, of Vancouver Island, and Dr. Wil- 

 liam Peters Gibbons, of Alameda, made similar observations at about the same time, as 

 did also Prof. George Davidson and Prof. John L. LeConte, the latter apparently in 1851. 

 The earliest published account is that of Agassiz, after notes of Jackson, in November, 

 1853. After him came Gibbons, in May and June, 1854 ; Girard, in August, 1854, and 

 others still later. See Eigenmann, Bull. U. S. Fish Comm. 1892, 405, for a full historical 

 account of these discoveries. 



