314(1 
Bulletin United States iVational Museum. 
s]>ots, while others have few or none. The young have no spots. f»ur 
specimens vary in length from 10 to 60 centimeters. 
iHilariiis hahanits has a large ami rather complex air hladtler. It lies 
close to the spinal column and extends almost to the jtosterior end of the 
body cavity. It is divided by a deep transverse constriction into two 
halves. The anterior part is heart-shaped, constricted dorso-ventrally. 
It is separated by a T-shai>ed partition into 3 chambers. Of these the 
anterior, transverse chamber is partly divided on the median line by a 
fold of the dorsal wall of the bladder over the vertebral cidumn. The 
transverse chamber is connected on each side with the 2 posterior lateral 
chambers by large openings in the ends of the transverse wall. The 
posterior half of the bladder is without ]>artitions. It is connected with 
the left lateral chamber only by a small opening. (.Jordan »fc Snyder.) 
Known only from Kio Ixtla at Puente de Ixtla, Morelos, Mexico. (Tyjie, 
No. 6149, L. .S. .Ir. Univ. Mus. Coll. .Jordan <Sc Snyder.) 
Isflanus haUannt, Jordan Jc .Snvder. Hull. U. .S. Fish Com. 1899 (1900), 118, Ilio Ixila, 
ilorelo^i. Mexico. 
Page 211. After Ahjansea tinceUa (Cuvier A; Valenciennes), in.sert: 
as; (b). AU;.l\SE.l L.K i sritls. .sti imlacbm-r. 
Head 3.67 ; depth .7; eye 4.7.5; snout 3.6; interorbital 3. 1). Ill, 7; A. 
Hi, 6; P.17; V. 9; scales 76-13. Body elongate, strongly comj)ressc-d be- 
hind; caudal peduncle long and slender, its length 5 in head, its dep’th 10; 
head pointed, rounded above, greatly increasing in width behind the eyes 
where the width is half the head’s length ; mouth slightly oblique, jaws 
equal; tip of chin slightly thickened; maxillary nearly reaching eye; 
gape 4 in head; preorbital boat-shaped, concave above, convex below, 
e((ual to eye, or 1.6 longer than wide; teeth 4-4, hooked, with compressed 
crowns. Origin of dorsal midway between anterior border of eye and 
base of caudal, a little in front of ventrals, whose origin is equally dis- 
tant between center of eye and base of caudal; height of dorsal 1.75 in 
head, its base half its height; height of anal 2.14 in head, or twice its 
base; caudal forked, 1.2 in head, the middle rays not quite half length 
of longest; ventrals short, 2.17 in head, their tips not reaching vent ; pec- 
toral 1.6 in head. .Scales firm, half-oval in shape, larger ]>osteriorly ; 
lateral line on middle of side, descending somewhat anteriorly. Color 
dark brownish gr.iy above, a darker band along middle of side; color 
below lateral line becoming abruptly lighter gray, merging into silvery 
on under parts. One example 20 cm. long from Lake Patzcuaro, Mexico. 
(Steindachner.) 
Ahjansea lactistrii, Steixd.cchxer. Einige Fischarten Mex., 10. pi. m, figH. 1-lfc. ISO.*), Lake 
Patzcuaro, Mexico. (Coll. Princess Theresa von Hayern.) 
Page 254. OrceUa, proposed by us for a subgenus in Xolropis, is pre- 
occupietl by OrceUa, Gray, 1866, a genus of Cetacea. For our use of it we 
substitute OrciUa. 
(trcula, Jordan A: Everma.nn, new siihgenus in yotropis (orca). 
