DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 133 



ALDKOVANDIA MACROCHIEA, (GCnther). (FiRiires 15r,-155a:) 



ffalosaurits macrochir, GuNTHER, Auu. :iiiil Mag. Nat. Hist., 1878, II, 2.51; Challenger Report, xxii, 1887, 237, 



pl.Lix, li};. A. 

 Halosaiirus macrochir, Goode ami Bkax, Bull. Miis. Comp. Zool., x, 1883, 219. 



Snout moderately produced, the preoral portion foniiiiig only one-third of its length. 

 Eye rather small, one-fourth of the postocular i)ortion of the head, and one-half of tiie 

 width of the iuterorbital 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 in front of that of the dorsal. Pectoral 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. These 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 ni)per portions of the gill cover and of the cheek are 

 covered with scales similar to those of the body. 



The band of intermaxillary teeth is broader than the maxillary band. Palatine teeth 

 in two separate patches, each being of an oval shape, with tlie pointed end directed for- 

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

 of the mouth; basil )ranchials with a long and broad band. 



Four well-developed gills. Outer branchial arch with l-i widely-set gill i-akers, of 

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

 towards the ends of the series. 



Radial formula: B. 12; D. 13; V. 10; P. 11-13; L. trausv. 11 | 5. 



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

 by the Challenge); ofl' the Strait of Gibraltar, Station v; depth, 1,090 fathoms; one speci- 

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

 mens, 1>S to 20 inches long. 



Specimens were also obtained by the Bhile, at Station cccviii, in 41° 24' 25" N. lat., 

 65° 35' 30" W. Ion., at a depth of 1,242 fathoms, and Station cccxxv, in 33° 35' 20" N. lat, 

 76° 00' W. Ion., at a depth of G47 fathoms. 



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

 from station 2051, in 39^ 41' N. iat., 09° 20' 20" W. Ion., at a depth of 1,100 fathoms; No. 

 33365, U. S. N. M., from station 2077, in 41° 09' 40" N. lat., 66° 02' 20" W. Ion., at a depth 

 of 1,255 fiithoms, and also from station 2074, in 41° 43' N. lat., 05° 21' .50" W. Ion., at a 

 depth of 1,309 fathoms; station 2534, in 40° 01' N. lat., 07° 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 depth of 888 

 fathoms; station 2140, in 17° 30' 10" N. lat., 76° 46' 05" W. Ion., at a depth of 966 fathoms; 

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

 2111, in 35° 09' .50" N. lat., 74° 57' 40" W, Ion., at a depth of 938 fatlioms; station 2106, in 

 37° 41' 20" N. lat., 73° 03' 20" W. Ion. ; station 2563, in 39° 18' 30" N. lat., 71° 23' 30" W. 

 Ion., at a depth of ],422 fathoms; station 2562, in 39° 15' 30" N. lat., 71° 25' W. Ion., at a 

 (lei)th of 1,434 fathoms; station 2.550, in 39° 44' 30" N. lat., 70o 30' 45" W. Ion., at a depth 

 of 1,081 fathoms; station 2571, in 40° 09' 30" N. lat., 67° 09' W. Ion., at a depth of 1,;{.5(; 

 fathoms; station 2564, 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 828 fathoms. 



ALDROVANDIA GOODEI,(Gill.). 

 Haloaaurus Goodei, GiLi., Proc. U. S. Nat. Mils., vi, 1881,2.57. 



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

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

 head, and measuring a little less than one-half of the width of the iuterorbital space. The 



