DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 133 



ALDROVANDIA MACROCHIRA, (GuNTnEn). (Fisures ir,5-15r,;i.) 



Halosaiirus marrochir, GrxTnEU, Ann. and Maii. .\at. Hist., 1)^78, ii,251; flialk-n','fr Report, xxii, 1887, 237, 



pi. Lix, iig. .v. 

 Haloaaurus macrochir, Godde ami Bean, Bull. Mils. Comp. Zn<il.. x, 1883, 219. 



Snout iiiodeiately produced, the preoral portion forming only one-third of its ieugth. 

 Eye rather .small, one-fourth of the postocuhir portion of the head, and one-half of the 

 width of the interorbital space. Maxillary reaching to the front margin of the eye. The 

 length of the head is more than its distance from the root of the ventral, the origin of 

 which is immediately m front of that of the dorsal. I'ectoral fin with narrow base, very 

 long, extending nearly to the root of the ventral. Scales of the lateral line larger than the 

 others, more or less hidden in a pouch of black skin, with a phosphorescent organ at the 

 base of the free portion. Tliese large scales are continued for some length on the tail and 

 cover the base of the anal fin, which, like the dorsal, is covered in its basal half with small 

 scales. Uniform black. 



The entire head is naked ; only the upper ])ortions of the gill cover and of the cheek are 

 covered with scales similar to those of the body. 



The band of intermaxillary teeth is lu-oader than the maxillary band. Palatine teeth 

 in two separate patches, each being of an oval shape, with the p()inted end directed for- 

 wards; pterygoid teeth in a very narrow band, which extends tar backwards in the cavity 

 of the mouth; basibranchials with a long and broad baud. 



Four well-developed gills. Outer branchial arch with li widely-set gill rakers, of 

 which the middle ones are slender and as long as the eye, the others becoming shorter 

 towards the ends of the series. 



Eadial formula: B. 13; D. 13; V. 10; V. 11-1.5; L. traiisv. 14 | 5. 



This form is common in the central parts of the Atlantic, where it was first discovered 

 by the Challenger^ off the Sti-ait of Gibraltar, Station V; depth, 1,090 fathoms; one speci- 

 men, 21 J inches long. Near Marion Island, station 140; depth, 1,375 fathoms; four speci- 

 mens, 18 to 20 inches long. 



Specimens were alst> obtained by the Bhihe, at Station CCOViii, in 41° 24' 25" E. lat., 

 650 35' 30" w. Ion., at a depth of 1,242 fathoms, and Station ccoxxv, in 33° 35' 20" N. lat., 

 760 00' W. Ion., at a depth of 647 fathoms. 



The Albatross secured specimens from the following localities: No. 33312, T". S. N. M. 

 from station 2051, in39o 41' N. iat., 69° 20' 20" W. Ion., at a depth of 1,100 fathoms; No. 

 33365, U. S. N. M., fi'om station 2077, in 41° 09' 40" N. lat., 06° 02' 20" W. Ion., at a depth 

 of 1,255 fathom.s, and also from station 2074, in 41° 43' N. lat., 65° 21' 50" W. Ion., at a 

 depth of 1,309 fiithoms; station 2534, in 40° 01' N. lat., 67° 29' 15" W. Ion., at a depth of 

 1,234 fathoms; station 2110, in 35^ 45' 23" N. lat., 74° 31' 25" W. Ion., at a deptli of 8S,S 

 fathoms; station 2140, in 17° 30' 10" N. lat., 70o 46' 05" W. Ion., at a depth of 960 fathoms; 

 station 2550, in 39° 44' 30" N. lat., 70° 30' 45" W. Ion., at a depth of 1,081 fathoms; station 

 2111, in 350 09' 50" N. lat., 74° 57' 40" W. Ion., at a de])th of 938 fatlioms; station 2100, in 

 370 41' 20" N. lat., 730 03' 20" W. Ion.; station 2503, in 39° 18' 30" N. Int., 71° 23' .'iO" W. 

 Ion., at a depth of 1,422 fathoms; station 2502, in 39° 15' 30" N. lat., 71° 25' W. ion., at a 

 depth of 1,434 fathoms; station 2550, in 39^ 44' 30" K lat., 70o 30' 45" W. Ion., at a depth 

 of 1,081 tiithoms; station 2571, in H)o 09' 30" N. hit., 67° 09' W. Ion., at a depth of 1,350 

 fathoms; station 2504, in 39° 22' N. lat., 71° 23' 30" W. Ion., at a depth of 1,390 fathoms, 

 and station 2533 in 40° 16' 30" N. lat., 67° 26' 15" W. Ion., at a depth of 82S fathoms. 



AiDROVANDIA GOODEI,(Gilx.). 



Haloaaurus Goodci, Gii,i-, Proe. U. S. Nat. JIus., vi, 1881, 2'u. 



The snout is moderately produced, its preoral portion forming two-seveiifhs of its 

 own length; the eye is small, equal to about one-fifth of the postociilar portion of the 

 head, and measuring a little less than one-half of the width of the interorbital »]y.Hi: The 



