204 BULLETIN 180, UNITED STATES NATIONAL MUSEUM 



7.4; 6.5; 7.0); distance from tip of snout to origin of dorsal 29.0 

 (31.5; 32.6; 34.2; 33.3) ; snout to origin of anal fin 57.4 (53.7; 57.9 

 60.8; 57.0); snout to insertion of pelvic fins 30.9 (29.0; 32.0; 31.7 

 30.8); tip of snout to center of vent 56.6 (52.3; 56.4; 58.9; 55.0) 

 distance from posterior base of anal fin to mid-base of caudal fin 

 14.7 (15.9; 16.0; 15.9; 16.0); least depth of caudal peduncle 13.3 

 (14.3; 13.3; 13.5; 14.1); length of longest ray of pectoral fin 20.0 

 (21.3; 22.7; 21.4; 21.8) ; length of longest ray of pelvic fin 11.8 (11.5; 

 12.9; 13.2; 12.5) ; length of longest ray of caudal fin 25.7 (25.6; 27.6; 

 29.4; 27.2) ; longest dorsal spine 5.0 (6.4; 5.4; 7.3; 7.4) ; longest soft 

 dorsal ray 10.3 (11.9; 12.0; 14.7; 12.5); longest soft anal ray 9.9 

 (12.8; 11.8; 11.8; 12.5); least preorbital distance 3.5 (3.6; 4.3; 3.5; 

 3.8) ; postorbital length of head 15.7 (15.1; 17.4; 16.8; 17.3) ; inter- 

 orbital space (fleshy) 7.4 (8.5; 8.4; 7.6; 8.0). 



^ S ■ - 



Figure 17. — Thalassoma marnae, new species: Holotype (U.S.N.M. No. 115563), 63 mm. 



in standard length. 



Dorsal rays VIII, 13 (VIII, 13; VIII, 13; VIII, 13; VIII, 13); 

 anal rays III, 11 (III, 11; III, 11; III, 11; III, 11) ; pectoral rays 

 14-14 (14^14; 14-14; 14-14; 14-14); number of scale rows crossing 

 lateral line from upper edge of gill opening to base of caudal fin 26 

 (26; 27; 26; 20); the downward bend of the lateral line usually 

 occurs at the 20th row; scales from base of first soft dorsal ray to 

 lateral line 21/2 (21/0; 21/2; 21/2; 21/2); scales from origin of anal 

 fin to lateral line 9 (10; 9; 9; 9) ; number of scale rows crossing breast 

 8 (8; 8; 9; 8) ; number of scales in a zigzag row around the caudal 

 peduncle 18 (18; 18; 18; 20); number of gill rakers on first gill 

 arch (7+10; 7 + 11; 7 + 10; 6 + 10). 



Size small, body somewhat compressed, its thickness about half 

 its depth, premaxillary protractile; pseudobranchiae present; gill 

 membranes attached to the isthmus with a narrow free fold across it; 

 the edge of the preopercle free posteriorly, but this free edge ends 

 just as it turns forward; lower lip with a wide frenum; anus just 

 in front of origin of anal fin ; peritoneum blackish ; body fully scaled, 

 head naked, lateral line complete with the downward bend occurring 

 on the twentieth scale row (rarely the nineteenth) ; upper and lower 



