81<s2 Bulletin //, Lhiited States National Museum. 
crossed irregularly with white; aual liii i)ule jiiuk, crossed with dark 
brown. There are 2 or 3 perfectly distinct types of coloration, as follows: 
Some specimens from pools containing green algie are pure light green, 
others from coralline iioolsare tinged with lavender, as /»’. embrijnm. This 
species resembles most closely O. maciiloatia, which name has been erro- 
neously applied to it, but it diflers markedly in its slenderer body, more 
pointed snout, the arrangement of the cirri, and the perfectly distinct 
coloration, also in the greater length of the dorsal fins, the enlargement 
of only one anal ray in the male, and the shortness of the maxillary. Coast 
of California. 
Specimens are at hand from Crescent City, Cal., li(dinas Bay, Half Moon 
Bay, Monterey Bay, and San Luis Obispo, Cal. Found in all kinds of 
jiools, from San Francisco to Monterey Bay, but nowhere common. Length 
60 mm. The most beautiful and active of the tide-pool fishes, extremely 
variable in color. (Greeley.) 
Centridermichthys maculosus, Guxther, Cat., II, 171, I860; not Oliyocollus maculosut, 
Girard. 
OUyocottus ?nacHio«w<, JORDA.v & Gilbert, Synopsis, 718, 1883; Jordan Sc Evermanx, 
Fishes of Xorth and Middle America, ii, 2013, 1898. 
Oligocottue snyderi, Greeley, in .Jordan 6c Everniann, Fishes of North and Middle America, 
in, 2871, 1898, Pacific Grove, Cal. (Tyjie, No. 5840, h. S. Jr. Univ. Mus. Coll. 
Greeley 6c Maddren.) 
Uialarchua snyderi, Greeley, Bull. U. .S. Fish Com. 1899, 15, tig. 4. 
946 (c) EXIMIA, Greeley. 
Exirnia, Greeley, Bull. TT. S. Fish Com. 1899 (Dec. 33, 1899), 18 (ruhellio). 
.\llied to Olifjocottua, but differing in the presence of a large three- 
liointed preopercular spine instead of the simple forked spine of (Jlujocot- 
tua. .Skin smooth. A slit behind the last gill. 
23S4 (c). EXIMIA III BELLIO, Greeley. 
Head 2g ; eye 3| in head; snout 3|; D. ATI or A"IH-15 or 16; A. 12 or 
13; P. 13 or 14; A'. 1, 3. Body compressed, snout pointed and comiiressed, 
head deep, occiput narrow, slightly concave; interorbital space narrow, 
^ the large eye, shallowly grooved. Nasal spines prominent, very large 
and pointed. Teeth small, pointed on jaws, vomer and jialatines; jaws 
equal, mouth horizontal, maxillary 3 in head, reaching a vertical below 
anterior edge of pupil. Margin of jireopercle armed with a very strong 
spine as long as eye, extending backward and downward, bearing on its 
upper surface a second and third spine, both pointing back and up; all 
the spines covered with skin in life; opercle ending in a rounded flap. 
Branchiostegals 6, not united to the isthmus; gills 3J, a slit behind the 
last gill. Aual papilla inconspicuous. Dorsal fins not joined ; first dorsal 
beginning in advance of margin of opercle, first 2 spines short, the 
upper margin slightly rounded ; soft dorsal beginning in advance of origin 
of anal, all the rays and spines very slender, pectoral reaching well 
beyond the origin of the anal; anal fin small, the rays slender, the mem- 
branes emarginate between each 2 rays; in the males the first ray enlarged, 
the second slightly elongated, the 2 united and not .separated from the rest 
