390 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
8. RHACOCHILUS TOXOTES Agassiz. 
(Plate xcii, fig. 2.) 
Rhacochilus toxotes Agassiz, Am. Journ. Sci. and Art (2), v. 17, 367, 1854; Archiv fur Naturge- 
schichte, 21. Jahrg., B. 1, 33; Girard, Proc. Acad. Nat. Sci. Phila., v. 8, 136, 1856; 
Girard, Expl. and Surv.'for R. R. Route to Pacific, v. 10, Fishes, 188, pi. XL, 1859 
(Tomales Bay); A. Agassiz, Proc. Boston Soc. Nat. Hist., v. 8^130, 1861; Cooper, Nat. 
Wealth Cal. by Cronise, 489, 1868; Jordan & Gilbert, Proc. U. S. N. M. 1880, 456 (San 
Francisco to San Pedro, California); Jordan &. Jouy, Proc. U. S. N. M. 1881, 11 
(Monterey, Wilmington, Santa Barbara, San Francisco, California); Jordan & Gilbert, 
Proc. U. S. N. M. 1881, 49 (San Pedro to San Francisco, California) ; Eigenmann, 1890; 
Jordan & Gilbert, Syn. Fish. N. A., 596, 1883 (California) ; Jordan, Cat. Fish. N. Am., 96, 
1885; Eigenmann & Eigenmann, Ann. N. Y. Acad. Sci., vi, June, 1892 (San Diego to 
San Francisco). 
Ditrema toxotes Gunther, Cat. Fish. Brit. Mus., iv, 247, 1862 (San Francisco). 
Pacliylabrus variegatus Gibbons, Proc. Acad. Nat. Sci. Phila., v. 7, p. 126; Archiv fur NaturV 
geschichte, 21 Jahrg., B. 1, p. 311, 1855. 
Habitat: San Francisco to San Diego. 
Body ovate, tapering abruptly into a long and robust caudal peduncle; mouth 
comparatively large, the lower jaw included; eye large; the soft dorsal rays consider- 
ably higher than the low spinous dorsal; caudal short, deeply forked, the upper lobe 
the longer; pectorals and ventrals long. Head, 3§; depth, 2§; D. x, 23; A. hi, 30; 
lat. line, 76. Color olivaceous with brassy reflections and dusky points; fins plain. 
7. NEODITREMA Steindachner & Doderlein. 
Neoditrema Steindachner & Doderlein, Denk. Ak. Wiss. Wien, XLVii 32, 1883 (ransonneti) . 
Type : Neoditrema ransonneti St. & D. 
This genus is described as a Ditrema without teeth in its jaws. 
9. NEODITREMA RANSONNETI Steindachner & Doderlein. 
Neoditrema ransonneti Steindachner & Doderlein (Yokohama, Tokio). 
Habitat: Japan. 
Strongly compressed, especially below the pectorals; profile to occipital process 
concave; mouth greatly protractile; head pointed, mouth oblique; lower jaw included ; 
maxillaries concealed under preorbital, reaching to eye. Dorsal spines graduated 
from the first to the last, which is equal to the snout and half the eye in length ; caudal 
widely forked, about equal to the head exclusive of snout. Back dusky, golden yellow 
below lateral line; base and tip of caudal dusky, remainder of fin yellow. Head, 3§ 
to 33; depth, 3^; D. vi-vm, 21 or 22; A. hi, 26-27. Lat. 1., 70. Br., 5. (Steindachner.) 
8. DITREMA* Schlegel. 
Ditrema Schlegel, Fauna Japonica, 77, pi. xl, fig. 2. 
Ditrema Bleeker, Yerh. Batav. Genootsch, xxv, 33 ( teinminckii ). 
Ditrema Brevoort, Narrative U. S. Exped. to Japan (Perry’s), n, 265, 1856 (first referred to the 
family Enibiotocidce) . 
Ditrema Giinther, Cat. Fish Brit. Mas., iv, 244, 1862 (=Embiotocidce). 
Ditrema Jordan & Gilbert, Syn. Fish N. A., 594, 1883 (=several genera). 
Type : Ditrema temmincMi Bleeker. 
* Ditrema: Air, double, and rpr/fia, hole; referring to the presence of the special generative aperture 
in addition to the anal one. 
