62 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
4. Carcharhinus falciformis (Bi broil ) . “Cazon de Wliaya.” 
Snout moderately prolonged and acute; nostrils without lobe; first dorsal rather backward; 
second dorsal and anal opposite, each other and of medium size; pectoral not twice as long as broad; 
upper teeth with a marked reentrant angle on outer border; two pores of nape well marked. 
Color, blue-black, deeper than in any other species. 
Two specimens, taken on a hook off the Morro at San Juan January 13, measured as follows: 
Measurements. 
No. 0298. 
No. 0299. 
Total length 
Ft. In, 
3 3 
2 4 
8 
11.5 
6 
3.5 
3 
1 1.5 
1 4 
Ft. In. 
7 4 
5 6 
Length of caudal tin from pit 
2 1 
1 4 
5.5 
7.5 
2 6 
Tip of snout to mouth 
No. 0299 possessed the following characters: Snout gently and narrowly rounded; first dorsal far 
in advance of ventrals, its height 9 inches, its base 11 inches; pectoral falcate, inner rays little pro- 
duced; second dorsal and anal opposite, equal in size; ventrals small, claspers 10 inches long; lower 
lobe of caudal about one-third length of upper, which is somewhat falcate. 
Color, olivaceous, paler below. 
Though we were constantly on the lookout for sharks and often had lines out trying for them, 
this is the only species obtained by us in Porto Rico, and only these two specimens were seen. They 
are probably more abundant at other seasons. 
Carcharias falciformis Bihron.in Muller & Henle’s Plagiostomen, 47, 1838, Cuba. 
Squalus tiburo Poey, Memorias, IT, 331, 1861, Havana. 
Carcharinus falciformis, Jordan & Evermann, 1. c., 36, 1896. 
5. Carcharhinus limbatus (Miiller & Henle) . Cuconetta. 
Snout somewhat pointed in fro'nt, rather produced, distance between its extremity and mouth 
somewhat less than width of mouth; nostrils nearly midway between extremity of snout and mouth; 
teeth similar in form in both jaws, erect, constricted, on abroad base, upper more distinctly 
serrated than lower; gill-openings wide, at least twice as wide as the small eye. Pectorals falciform, 
extending beyond end of. dorsal, length of their upper margin nearly four times that of lower. First 
dorsal commencing very close behind axil of pectoral; origins of second dorsal and anal opposite each 
other, the bases being nearly equally long. Caudal tin long, its length equal to distance between 
origins of the two dorsal fins. 
Color, gray, lower side of extremity of pectoral, extremities of second dorsal and anal, and of 
lower caudal lobe, black. (Gunther). 
Found in tropical seas, north to Florida; numerous specimens once taken at Woods Hole, Mass.; 
common in Brazil; used as food by the very poor. Not seen by us in Porto Rico, but recorded from 
there by Doctor Stahl. 
Carcharias ( Prionodon ) limbatus Muller & Henle, Plagiostomen, 49, 1838, Martinique. 
Isogompliodon maculipimiis Poey. Repertorio, I. 191, pi. 4, tigs. 2 and 3, 1867, Cuba. 
Carcharias miiller i Steindachner, Sitzb. Akad. Wiss. Wien 1867, 356, West Indies. 
Carcharias microps Lowe, Proc. Zool. Soc. 1810, 38, Madeira. 
Prionodon cucuri Castlenau, Anim. Non. I-tares. Amer. Sud, Poiss., 99, 1855, Baliia. 
Platypoclon ! Poey, Fauna Puerto-Riquena, 348, 1881. 
Platypodon maculipinnis, Stahl, 1. <?., 81 and 167, 1883. 
Carcharhinus limbatus , Jordan & Evermann, 1. c., 40, 1896. 
