108 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
59. Siphostoma elucens (Poey). 
Head 7 in total length; depth 3.6 in head; snout 1.9 in head; body rings 17; caudal rings 32. 
D. 23, on 1 + 4 rings. Body rather stout; snout moderate; keels rather strong; pouch of male covering 
about 17 rings. 
Color grayish-brown, back and sides more or less mottled with lighter and darker; lower half of 
snout with alternate bars of white and brown. 
Known only from Havana and Porto Rico; one specimen, a male, 6 inches long, with pouch tilled 
with eggs, obtained at San Antonio Bridge, January 12. 
Syngnathus elucens Poey, Synopsis, 443, 1867, Havana. 
? Syngnathus flavirostris Poey, Enumeratio, 178, 1875, Havana. 
? Syngnathus picturatus Poey, Enumeratio, 178, 1875, Havana. 
? Syngnathus linea Poey, Enumeratio, 178, 1875, Havana. 
? Syngnathus marmoreus Poey, Enumeratio, 178, 1875, Havana. 
? Syngnathus ascendens Poey, Enumeratio, 179, 1875, Havana. 
Siphostoma elucens, Jordan & Evermann, 1. c., 768, 1896. 
60. Siphostoma jonesi (Gunther). 
Rings 17 + 32. Dorsal 18, on 1 + 5rings. Head and snout short, the latter somewhat bent upward, 
shorter than the postorbital portion of the head, keeled above, but without spines in the median line. 
Interorbital space concave, crown and occiput with a median keel. Keels of body sharp but not spiny; 
lateral keel of the trunk passing into lower keel of tail; a ridge running across opercle but not reaching 
its end; tail twice as long as trunk without head; caudal very short. 
Color: Blackish-brown; upper half of trunk with 3, upper half of tail with 7, equidistant white 
crossbands. 
Bermudas and Porto Rico. Two small males, 2.75 and 3.50 inches long, respectively, dredged at 
station 6085, between Vieques and Culebra islands, in 14 fathoms, February 6. The larger has the 
pouch well filled with eggs and the other has a few eggs. 
Syngnathus jonesi Gunther, Ann. Mag. Nat. Hist., series 4, XIV, 8, 1874, Bermudas. 
Siphostoma jonesi, Jordan & Evermann, 1. c., 768, 1896. 
Fig. 21. — Corythroichthys cayorum. 
Genus 41. CORYTHROICHTHYS Kaup. 
This genus differs from Siphostoma in the strong keel on top of head, the strong opercular ridges, 
the short, stout body with prominent angles, and the very short snout. Three species known. 
a. Top of head strongly carinated, keel usually extending from interorbital space to first body ring; body stout, 
usually with sharp angles and variegated coloration; head in line with axis of body; opercle with a prominent 
ridge. 
h. Caudal rings about 30; dorsal rays 23 to 27, snout short. 
r. Rings 18 + 30; dorsal rays 23, on 1 + 4 rings; snout 2.4 in head, its color white; body with 12 irregular brown cross- 
bands, and white markings albirostre 
hh. Caudal rings 25, body rings 20; dorsal rays 40, on 3 + 7 rings; snout long, more than half head; form of body unde- 
scribed cayennense 
bbb. Caudal rings 26, body rings 17; dorsal rays 21, on 1.5 + 3.5 rings; snout very short, 3.2 in head cayorum, 61 
61. Corythroichthys cayorum Evermann & Kendall. 
Head 8.6; depth 12.6; snout 3.2 in head; eye 4.33; D. 21 rays, on 1 .5+ 3.5 rings; A. 3, on first caudal 
ring; C. 10; P. 10. Rings 17 + 26=43. Body short and stout; head short, snout very short; tail but 
little longer than head and trunk. Cranial ridges strong; a high, sharp keel on snout; occipital keel 
very high, its edges convex, notched near middle, not continuous with keel on snout; a strong supra- 
ocular ridge, beginning opposite posterior end of nasal keel and continuing backward, with one hiatus 
upon upper edge of opercle; just below this on opercle another longer but scarcely stronger ridge; 
