DISCUSSION OP SPECIES AND THEIR DISTRIBUTION. 131 



Height, 14,V in total length. Head, 7£. Eye, 2 in snout, 5 in bead, reaching to profile. 

 Interorbital space less than long- diameter of eye. Snout scaleless. .Mouth moderate, not 

 nearly reaching tip of snout. Dorsal fin over the space between ventral tins and vent. 

 Longest dorsal rays (second and third) twice, as long as the base of the fin. Pectorals scale 

 less, longer than ventrals. Vent nils scaly. Vent in anterior half of total length. No anal 

 papilla. Base of anal scaly. Caudal consists of two hair-like rays. Lateral line very low 

 down and disappearing posteriorly. 



Radial formula: B. 14; D. 11; A. 191; P. 11; V. 10; scales, 14-ca. 170-6. 



The first individual obtained was caught in February. It was a female with eggs, 

 which were in two masses lying side by side, 5i inches long, notcovered with a sac Pyloric 

 cujca 12, small. Air bladder 5 inches long and with a delicate silvery coat, intestine 

 straight. Peritoneum black anteriorly, posteriorly with patches of black lines on a pale 

 ground. (Johnson.) Two specimens (No. 34418, U. S. N. M.), one 10i inches and the other 

 21 inches in length, were obtained by the Albatross at station 2181, in 39° 29' N. hit., 71° 40' 

 W. Ion., at a depth of 093 fathoms. 



Others were obtained by the Blake at stations Lxvn, 128-240 fathoms, and lxviii, 

 243-458 fathoms, off Guadeloupe and Santa Lucia. 



HALOSAURUS JOHNSONIANUS, Vaillant. (Figure 153.) 

 Halosaurus Johnsoniamis, Vaillant, Exp. Sci. Travailleur et Talisruau, 181, pi, xv, fig. 2, 2\ 2 b , 2 C , 2*. 



This Halosaurus is very similar to the preceding, but does not appear to reach so large 

 a size. The form is more slender, the height not exceeding one twenty-fifth of the total 

 length ; the body is cylindrical, but it should be remarked that we have not obtained a sin- 

 gle example in a state of preservation comparable to that of certain individuals of the pre- 

 ceding species (Halosaurus Oweni). 



The form of the head, the proportions of the muzzle, those of the eye and the inter- 

 orbital space, the arrangement of the gill cover offer nothing distinctive. Moreover, if we 

 may be able to judge, this last is not scaled; but on the temples and the upper part of the 

 head scales are present without doubt. 



The vent is very little behind the anterior third of the body and is distant from the 

 end of the snout only 3 times the length of the head. 



The origin of the dorsal is at a distance from the end of the snout equal to twice the 

 length of the head. The pectorals do not reach nearly to the insertion of the ventrals, 

 which is at a distance from the end of the snout less than twice the length of the head; 

 the ventral is wholly in advance of the dorsal. 



The coloration, although approaching that of Halosaurus Oweni, Johnson, shows certain 

 differences. Each scale shows at its free extremity a black spot, forming a reticulation in 

 check pattern. The dark scales of the lateral line form a pronounced band; finally, as in the 

 following pages, the dark color of the branchial cavity is more extended on the scapular 

 regions, extends across the gill covers and on the whole head. These characters, together 

 with the accessory characters, are sufficient to distinguish this species from the preceding, 

 to which it is nearly related. 



Radial formula: B.12; D.1,10; A. 186(1); V.1,8. 



Total length of type (millimeters), 390. Height, 15.04. Thickness, 12.03. Head, 47.12- 

 Snout, 22.47. Diameter of eye, 7.15. Interorbital space, 4.08. — Vaillant. 



Ninety-six individuals are tabulated by Vaillant; the localities are off the Morocco 

 coast, the Canaries, Soudan, and on Arguin Bank, the depths ranging from 834 to 2,115 

 meters. 



HALOSAURUS GUNTHERI, Goode and Bean, n. s. 



Vertex scaly. Snout produced, its preoral portion contained 2^ times in its length. 

 Eye large, its length equal to half that of the snout, half that of postocular portion of the 

 head, and much wider than the width of the interorbital space, and contained 5 times in 

 the length of the head. Maxillary reaching nearly to front margin of the eye. Length of 



