23 GENUS SKBASTODES. 591 



ANALYSIS OK NORTH AMERICAN SPECIES OB SEBASTOfiES. 

 a. Interorbital space convex (uever concave), broad, less than 3| in base 

 of skull, cranial ridges very low or obsolete, the spines when present, 

 delicate; base of skull strongly curved, mesethnioid processes not 

 elevated (not directed upward), ventral process of basisphenoid rudi- 

 mentary (01 fairly developed only in young); skull usually thick; 

 anal rays III, 9 to III, 6; gill-rakers usually long and slender; 

 snout, preorbitals and jaws more or less scaly. 

 b. Cranial ridges (except parietal) all obsolete or very slightly devel- 

 oped, cranial spines absent or very inconstant and minute (regu- 

 larly present only in young), (preooular spines usually present in 

 my8tinu8); lower jaw much projecting, 

 c. Parietal bones not meeting, mesethnioid processes weak and de- 

 pressed; scales small, 90-100 transverse series of scales above 

 lateral line, peritoneum white, lower jaw much projecting, en- 

 tering profile, a large symphyseal knob, directed forward. A. 

 Ill, 8-III, 9. 

 d. Head 2$; depth 3£; D. XIII-13; A. Ill, 9; lat. 1. tubes 65-80, 

 transverse rows of scales about 100. Maxillary reaching be- 

 yond eye (in adult), 1$ in head; lower jaw much projecting, 

 with a large symphyseal knob, eye large, 4-6 in head. Scales 

 very small, irregular. Anal spines small, graduated. Pale 

 dull orange red, dark brown above; young olivaceous. Peri- 

 toneum white. San Diego to San Francisco, abundant, and 

 to British Columbia (Bean). paucispinis* 



dd. Head, 2i ; depth, 3|. D. XIII-14; A. Ill, 8; lat, 1. 55 

 (pores), transverse rows of scales above lat. 1. about 90. 

 Maxillary reaching little beyond middle of orbit, 2£ in head; 

 lower jaw much projecting, with large symphyseal knob. Eye 

 3| in head; nasal spine obsolete; interorbital width 4£ in 

 head; anal spines, short, strong, graduated. Scales rough- 

 ctenoid. Dusky olivaceous, silvery below, flushed with red. 

 Peritoneum white. San Diego to San Francisco. goodei.\ 

 cc. Parietal bones usually meeting, mesethmoid processes better 

 developed, straight, not elevated, 

 e. Peritoneum white; dorsal fin deeply emarginate. 

 f. A. Ill, 9. 



* Sebastes paucispinis Ayres, Proc. Cal. Acad. Sci., i, 6, 1854. 

 t Sebastodes goodei Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., 

 12, 1890. 



