30 THE ZOOLOGIST. 



Macrurid.e. 



Macrurus investigatoris, a deep-sea fish from the Indian 

 Ocean at a depth of 446 fathoms (2676 ft.). A prominent 

 bulbous swelling of thin bone under the skull, and sufficiently 

 transparent, allows the sagittae to be seen "in situ." The 

 sagittae could be picked out of their pocket through the opening 

 at the top of it ; they are large for the size of the fish (fig. VI., 3). 



Macrurus armatus has a similar bulbous excrescence to 

 that above described that contain the sacculi. 



Bathygadus furvescens, a deep-sea fish from the Indian Ocean 

 at 555 fathoms (3330 ft.). A bulb of transparent bone under 

 the basi-occiput allows the sagittae to be seen ; they are fairly 

 large for the size of the fish (fig. VI., 4). They fill the cavity in 

 which they rest, giving no room for motion, and were got out 

 easily without much cutting away of bone. A distinct lagena 

 with a special pocket for it. 



Gadidje. 



Bregmaceros macclellandii, from the Bay of Bengal, Indian 

 Ocean. Gunther says of it, " a dwarf Gadoid, the only one 

 found at the surface between the Tropics." As in other Gadoids 

 the sagittae are large for the size of the fish (fig. IV., 3). The 

 specimen obtained was only two and a half inches in length. 



Gadus merlangus (the Whiting). Illustrated fig. VI., 8. 



Berycidje. 

 Hoplostethus mediterraneus, a deep-sea fish from the Indian 

 Ocean, got at 330 fathoms (1980 ft.). A large transparent 

 bulbous swelling under the basi-occiput allows the sagittse to be 

 clearly seen. When the head was inverted and rocked from side 

 to side the sagittae, the right-side one especially, could be seen 

 moving in the sacculus and falling from side to side, showing 

 the roominess of the cavity containing them. The sagitta is 

 large and of uncommon shape, with its two little projecting 

 spikes (fig. VI. ,2). The "sulcus acousticus"runs in a boldly curved 

 line along the length of the stone and curves upwards at the 

 forward end. The sacculus has a distinct lagena to it. 



CENTRARCHIDiE. 



Kuhlia marginata. Illustrated fig. IV., 1. 



