266 



BULLETIN OF THE BUREAU OF FISHERIES. 



Measurements of a Female 147.5 Cm. (58 Inches) Long from Newport River, Aug. 3, 1914. 



Breadth of head 20. 8 



Tip of snout to — 



First gill slit Ji. 4 



Last gill slit 27. 3 



Base of pectoral 26. o 



Front of moutli 7. 8 



Depth of body at origin of first dorsal 18-5 



Horizontal diameter of orbit i. 7 



Length of nasal aperture 1.7 



Distance between angles of mouth 10. o 



Height of— 



First gill slit 4-9 



Second gill slit 5-6 



Third gill slit 6. o 



Fourth gill slit 5-S 



Fifth gill sUt 4-8 



Length of anterior margin of first dorsal x6. 9 



Length of posterior margin of first dorsal 4. s 



Base of first dorsal 10. 4 



Distance between dorsals 27.3 



Length of anterior margin of second dorsal 7. 4 



Length of posterior margin of second dorsal 6. s 



Base of second dorsal 4. 8 



Distance f rem second dorsal to base of caudal 9. o 



Length of outer pectoral margin 19. 4 



Length of inner pectoral margin 6.8 



Breadth of pectoral 12. 6 



Axil of pectorals to origin of ventrals 27. s 



Length of outer margin of ventrals 9. s 



Length of inner margin of ventrals 3.8 



Breadth of ventrals 8.3 



Distance from base of ventrals to origin of anal 9. a 



Length of anterior margin of anal 6. o 



Length of posterior margin of anal 4. 2 



Base of anal 8. o 



Distance from anal to base of caudal 7.3 



Length of upper caudal lobe 29. 3 



Length of subcaudal lobe 13.0 



Tip of caudal to notch 7. 7 



Dorsal fin high, anterior margin slightly convex, distal margin rather deeply concave, posterior 

 lobe short, acute angled, origin of dorsal over tip of inner pectoral lobe; second dorsal small, slightly 

 behind origin of anal ; distal margin deeply concave, upper lobe roimded , lower lobe acuminate; pectorals 

 short, their length not much greater than their breadth; distal margin slightly concave; anal low, broad, 

 distal margin plightly incised; caudal short, about one-fifth total length; subcaudal lobe prominent. 



This individual had nine embryos, six in the left uterus and three in the right one. Of these three 

 were males, 12.2 to 14. i cm. long, and four females 13.4 to 14 cm. long. Another specimen, 124 cm. long, 

 taken on Bird Shoal August 6, 1914, had fotu" embr>'os in each uterus, about 17.5 to 18.5 cm. long. The 

 embryos lie with the head at the forward end of the uterus. The placenta, which was nearly as long as 

 the embr>'0, was richly supplied with villi, some of which were 25 mm. long by 3 mm. in diameter. The 

 yolk sac at the end of the placenta was attached to the wall of the uterus and was richly supplied with 



blood vessels. 



Specimens Taken During the Summers of 1912 to 1914. 



Date. 



June 27. 



Do.. 



Do.. 

 July II.. 



Do.. 



Do.. 



Do.. 

 July 30. . 

 Sept. 10. 



July I.. 

 July 22. 



July 22., 

 Aug. 3.. 



Do. 

 Aug. 6. . 



Do. 



Locality. 



Near laboratory. 



....do 



....do 



Near Morehead . 



....do 



....do 



do 



Newport River. 

 North River 



....do 



Town Creek. 



North River 



Newport River. 



....do....; 



Bird Shoal 



do 



Length. 



cm, 

 42.5 



49.4 



48.7 

 95.0 

 73- o 

 70. o 

 70.0 

 47.0 



S8.7 



89.8 



54- o 

 94.0 



1-4. S 

 97.0 



124.0 



Weight. 



fframs. 



2S6 



474 

 369 

 3,290 

 1,274 

 1,161 

 1, 161 



7S0 



Sex. 



Stomach contents. 



I shrimp (P. brasiliensis): remains of a 

 small teleost; fragments of eel grass; 

 bit of wood. 



1 shrimp {P. brasiliensis). 



I small crab; 2 small yellow stones. 



3 shrimps (P. brasUiettsis). 



Empty. 



Material tmidentifiable. 

 Do. 



Empty. 

 Do. 



Small blue crabs. 



I large blue crab and other unidentifi- 

 able material. 



Remains of a blue crab. 



Empty. 



1 blue crab. 



2 blue crabs; 1 pinfish; mass of algae. 



This species is much more abundant in the harbor than the hammer-head, and appears to enter the 

 harbor for the purpose of giving birth to its young. 



