296 DEEP SEA FISHES. 



but which of these names should be applied to it is a question to be settled 

 by priority in publication of the works in which they first appear. The 

 "Oceanic Ichthyology" of Goode and Bean, the source of Aldrovandia, 

 was published jointly by the Smithsonian Institution, the U. S. National 

 Museum, and the Museum of Comparative Zoology. The Smithsonian and 

 the National Museum gave to their portion of the work the date of going 

 to press, 1895, and the Museum of Comparative Zoology gave to its share 

 the date of completion, and distribution, September, 1896. In Collett's 

 book on the fishes secured by the yacht " ITIirondelle," the origin of Halo- 

 sauropsis, it is stated that "Ce Fasciciile a ete public et le depot fait au 

 Gonvernement a Monaco le 1" Juillet 1896." From this it is evident that 

 Ilalosauropsis will have to be retained as the name of the subgenus while 

 Aldrovandia becomes a synonym. 



Species of the Ilalosauridtc have been taken in the Atlantic including 

 the Mediterranean from the tropics to a latitude of 42° north, and in the 

 Atlantic and the Indian Ocean southward to the parallel of 46° or there- 

 about. In the western Pacific north of the equator, the " Challenger," and, 

 in the northern extensions of the Indian Ocean, the " Investigator " se- 

 cured a number of others. In the eastern Pacific two species obtained by 

 the " Albatross," and described below, establish the distribution in the Gulf 

 of Panama and westward to a short distance north of Culpepper Island. 

 The known vertical distribution extends from a depth of one hundred and 

 twenty-eight fathoms to one of two thousand seven hundred and fifty 

 fathoms. 



Apparently the fishes of this group live at the bottom. The positions 

 of their lanterns on the lower portions of the head and the body indicates 

 a probable habit of illuminating the mud for a short distance around the 

 individual in its search for prey. There are no special tactile organs, aside 

 from the soft and flexible snout. The eyes are well developed. 



Halosaurus attenuatus sp. n. 



Plate LX. fig. -?, 1 a. 



Br. r. 15; D. 11 ; V. 8 ; P. 15. 



On the specimen described nine and one half inches, of its total length 

 of sixteen, are behind the vent in the tail. The body is elongate, slender, 

 moderately compressed and becomes very attenuate and filamentary in the 



