36 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
Measurements of typical specimen. 
(No. , United States National Museum.) 
prem e Lem obese ten ae ee seme seem e Se ea eee een ie Ona bess 
bemeth tor basetot: caudal mum vs.4 uN seiios ck eos deck sscoeeetr 9.90 inches = 1.00 
Greatest depth .....------+---+ se 2-20 22-22 eee eee eee es ee eens pe eee oe +--+ -- Al 
IGRI UKE OQUINER Ae) else Gegteda Hepacae Los tao seo Sees Econo NG os. nos aeSeag sass s5c 105 
Length of caudal peduncle...-.....--..----- Saeko cosbs5 Scanay Seedsécosos=- 065 
Wenoiivotenea der cat asseaisaa =—le\ee a In PAS SH SHSSOS OOOOH HHSd ScceeaosSnc 220 
Midthvoteinbenronitalmatedo sss) he oes eseee eee am seme nannies = ase sane -O17 
ILAMCHIN, CHE SIOW hagas dosoed dasamsa urd sa6e boo5 bodGMponba bubgenasoeas Bebees 04 
Men ot hho teams laevis een ae eye eteei seme eeteeise toes ea Pe ee es See 10 
Menmthot mandibles. 3. diesem se ase eteae oma c ee celee oee meee ete eer ae 11 
Diane tervorvor Dit siete sco ske peste si eeneo tetasle mae lole wee ebaries peeame ms 065 
Distancesrom/snombsto|dorsaliti= soe cociseris ole eicie oie = eee ee seem ee ieee ete 075 
enethuotebase)ofad orsalleepas.e cee ete neee rece nesise Sate eioeiee seine aes . eid 
(Creabestihel chitotedonsalems cane satan s eescctaicins «eects ete ee eee eee ree 10 
DistancerofsanallsiromysnO mt seseee-eeeee ease eies eee bees aeiee == ee eee eee oz 
Wene the otapaseno tamale yacpeni-812 See oe sllsostsee Shon asin oats emis sme neers .69 
HershtOriloneestTay s2s(oscs esc 2-64 sees ton wie ose Pe eee sae soe oe) ees heeeae lL 
reno thiotme nite alle q/Soevs tetas Saeco s oe eee oe oso SEM ee salen ee ek eiaaee 13 
keno chrommectoralk(imhbysid eC) sees aoe ses ae else alenticieisebeeie sete anise = 24 
mene thyotientralss S26 Sac.0 25 aco see siete wis oe seieismiens oe oe ope ae Slalom ee semen 085, 
The typical example of this species was taken on a hook on the west 
side of the island of Santa Catilina, Los Angeles County, California. 
DESCRIPTION OF A NEW RAY (PLATYRUINA TRISERIATA), FROM 
THE COAST OF CALEFORNIA. 
EY DAVID Ss. JORDAN AND CHARLES H. GILBERT. 
; PLATYRHINA TRISERIATA. 
Disk broad-ovate, broader than long; the snout very bluntly rounded, 
not projecting; the angle formed anteriorly by the pectorals very ob- 
tuse; anterior margins of the pectorals slightly convex; tail stout, in 
form intermediate between Raia and Rhinobatus, its width at base about 
equal to the length of the snout and a little more than the interorbital 
width ; tail much longer than the disk, not much depressed, its sides 
vertical, its lower lateral edges with broad horizontal fold, a slight 
groove above on each side of the median series of spines. 
Dorsal fins similar, higher than long, the anterior far behind the end 
of the claspers ; the posterior free margin of both fins very convex, not 
forming an angle. Caudal fin large, well developed both above and 
below, its outline entire, elliptical. Ventral fins with their margins en- 
tire, the claspers well developed. Pectoral fins extending forward to a 
point but little short of the tip of the snout. 
tostral ridges wide apart at base, rapidly convergent, inclosing a tri- 
angular area; a slight translucent space separates this from the opaque 
pectorals; eyes small, wide apart, the broad spiracles close behind them. 
