i 9 4i CATALOGUE OF FISHES OF TORTUGAS 275 



Hemiemblemaria Longley and Hildebrand 

 Hemiemblemaria Longley and Hildebrand, Carnegie Inst. Wash. Pub. 517, 1940, p. 273. 



Hemiemblemaria simulus Longley and Hildebrand 



Hemiemblemaria simulus Longley and Hildebrand, Carnegie Inst. Wash. Pub. 517, 1940, 

 p. 273, pi. 1, figs. 2a, ib — Tortugas, Florida. 



Chaenopsis ocellatus Poey 



This genus appears to have been known from the West Indian region, till the 

 present, only through the type of Chaenopsis ocellatus, a male about 125 mm. in 

 length. Its fin formulas are D. XIX,34; A. 11,35; P- x 3' tnat * s ' a dorsal spine and 

 a pectoral ray more, 4 dorsal and 3 anal rays less than indicated in the original 

 description; ventrals with 1 weak spine with a filamentous tip, and 3 rays, the 3d 

 very slight. 



More than 30 specimens have been available for study. In 7 individuals exam- 

 ined, the dorsal fin has 52 to 54 supports, the anal 36 to 38, so in total number the 

 Cuban specimen falls within the limits of the Florida material. 



Florida fish of both sexes are mature at as small a length as 75 mm., and none 

 as large as the Cuban specimen has been obtained, but all belong, I think, to the 

 same species. 



Males and females are readily distinguishable, as in the latter the anus is 

 surrounded by a series of papillae wanting in the male, in which the dorsal fin is 

 somewhat higher anteriorly than in the other sex. 



This fish occurs commonly on bottom covered by sand or fine gravel. Hidden 

 tubes of sand grains cemented together by a transparent, elastic, glairy substance, 

 which has the appearance of having been recently secreted by the fish, house 

 almost all. These tubes are nearly vertical and in them the fish rest, sometimes 

 with bodies protruding for nearly half their length. 



The species is changeable in shade. In the dark phase, to which the adult males 

 most strongly incline, the dorsal surface is light-colored, the sides olive, growing 

 lighter toward the belly. The gray dorsal surface is finely flecked with dark 

 color, and at regular intervals these spots are ordered in transverse series, form- 

 ing some twelve hairlines across the back. In paler phases the most notable differ- 

 ence is the lightening of the ventral color. With the exception of the dorsal and 

 anal, the fins are transparent; a dark spot between the first 2 spines of dorsal, at 

 the most semiocellated; the fin otherwise plain and dusky anteriorly, but grow- 

 ing paler and faintly barred behind; anal with a submarginal dusky line through- 

 out its length. 



The eggs are deposited in the tubes in which the fish live. The single lot dis- 

 covered was found on June 12. The eggs are oblate spheroids, 0.95 mm. in diam- 

 eter and three-fifths as much from pole to pole. The tube with the eggs was 

 occupied by a female with functional ovaries. This is the only instance in which 

 I have found a female of any species of fish guarding or seeming to guard her 

 eggs. W. H. L. 



