i94i CATALOGUE OF FISHES OF TORTUGAS 3 



Family SPHYRNIDAE. Hammerhead Sharks 



Sphyrna tiburo (Linnaeus). Bonnetnose shark 



This shark apparently is not common at Tortugas, as only 1 specimen, 92.5 cm. 

 long, was taken. The slits of its pupils, like those of the hammerhead, are hori- 

 zontal, not vertical as in other sharks observed. One uterus contained 4 young 

 and the other 5, each 137 mm. long. The walls of the uteri were thin, vascular, 

 and wrinkled, with the delicate egg membrane enclosing each young fish simi- 

 larly plaited, its folds fitting so closely within those of the uterus that a per- 

 ceptible tension was necessary to separate the two. Long villi, close together, 

 formed a fringe upon the entire length of the yolk stalk. The stomach contained 

 an octopus. 



The foregoing information is from Dr. Longley's field notes. His collection 

 contains 1 embryo, 220 mm. long. 



Reported from both coasts of the Americas and also from the Orient. 



S.F.H. 



Sphyrna zygaena (Linnaeus). Hammerhead shark 



This shark, according to Dr. Longley's notes, is rare at Tortugas, as only 2 

 were observed during many summers at the Laboratory. One specimen, 217 cm. 

 long, taken in a gill net near shore, had a maximum depth of 262 mm.; width 

 of hammer 500 mm.; width of mouth 125 mm. The pupils in this shark, as in 

 the bonnetnose, were horizontal and not vertical as in other sharks observed. 

 The stomach contained the mantle of a large squid, the plates of a trunkfish, and 

 an 85-cm. houndfish. 



Reported from both coasts of America, and from the Orient. S. F. H. 



Family SQUALIDAE. Dogfishes 



Squalus acanthias Linnaeus 



The Tortugas collection contains 7 embryos, 5 each about 220 mm. in length, 

 and 2 smaller ones, each about 135 mm. long. The characteristic spines in the 

 dorsal fins, even in the smaller embryos, are already fairly well developed. 



No data or field notes pertaining to these specimens were found. 



Common on both coasts of the north Atlantic, ranging to the West Indies. 



S.F.H. 



Etmopterus hillianus (Poey) 



One specimen in rather bad condition, about 315 mm. long without caudal fin, 

 taken south of Tortugas in 357 to 392 fathoms, was identified by Dr. Longley as 

 this species. Head to first gill opening 64 mm.; depth 64 mm.; eye 13 mm.; snout 

 22 mm.; snout in advance of mouth 35 mm.; interorbital 20 mm.; width of 

 mouth 22 mm.; length of base of first dorsal 16, second dorsal 23 mm.; length 

 of 1st dorsal spine 10, 2d dorsal spine 20 mm. Snout, in advance of the nearly 

 straight transverse mouth, broad and depressed; first dorsal inserted nearer 



