210 



REPORT OF THE COMMISSIONERS OF 



Measurements. — Continued. 

 Length of posterior, margin of dorsal, 

 From first to second dorsal. 

 Length of second dorsal base, . 

 Middle of second dorsal base to top of fin 

 Posterior margin of second dorsal. 

 Second dorsal to caudal jiit, 

 Caudal from pit. 

 Lower caudal lobe. 

 Terminal caudal lobe, 

 Snout to pectoral, obliquely, 

 Length of pectoral. 

 Lower margin of pectoral, 

 Extended pectoral not quite reaching to perpendicular through front 



of dorsal. 

 Ventral origin slightly behind end of first dorsal base. 

 Length of ventral, .......... 



Inner margin of ventral, ......... 



Vent to tip of clasper, . ........ 



End of ventral base to origin of anal, ...... 



Anal base, ........... 



Hind margin of anal, ......... 



Depth of anal, .......... 



Anal base to origin of lower caudal lobe, . . . . . 



3yz in. 



i^ '■ 



1% " 



3^ "■ 



3 " 

 I 



2 " 



13/ " 



5. Squalus acanthias {Linnams). HoRXiiD Docfish. — The spined dogfish has 

 been brought from Gravesend Bay in October only ; it is common on the fishing banks 

 oft the New Jersey coast. The species is not hardy in captivity. 



6. Squatina squatina {Liiuuciis). Shark Ray ; Monkfish. — The shark ray has 

 not been received alive, and is to be found only in the bays adjacent to the Atlantic. 

 It appears occasionally in Gravesend Bay in summer. 



7. Raia erinacea {Mitchill). Common Skate. — The prickly skate was received 

 from Gravesend Bay in November, 1897, ^■'"^ '^he eggs came from there in March, 

 1896. The species has deposited eggs in the Aquarium in winter. It will not live 

 in the tanks in summer, but endures the spring, fall and part of the winter. 



8. Raia laevis {Afitc/n'l/). Barndoor Skate. — This skate has come to the Aqua- 

 rium from Gravesend Bay in October, 1896 and 1897. It is short lived in captivity 

 because of the want of sand and mud, and tiie difficulty of providing suitable food. 

 Individuals have been kept alive three or four months. 



