23.2 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



Family Pseudotriakidte 



PSEUDOTRIAKIS ACRALES' Jordan and Snyder, new species 



Oshizame (Dumb Shark) 



(Plate LXII) 



One example, 172 centimeters long, from off Toi in Suruga bay. 

 Type No. 12,903, Ichthyological collection, Leland Stanford Junior 

 University. 



Depth of body at origin of first dorsal about gyi hi total length ; 

 head measured to first gill opening 5^ ; snout 2^ in head meas- 

 ured to first gill opening ; width of interorbital space 2y ; head 

 broad and flat, the greatest width contained i^4 times in the length, 

 the depth 2^ ; interorbital space slightly concave ; orbit narrow 

 and long, its diameter 8 in head, the skin below eye with a deep 

 fold ; spiracle elongate, the greatest width equal to half the diam- 

 eter of orbit; width of space between spiracle and first gill open- 

 ing 3^ in head ; height of third gill opening equal to diameter of 

 orbit; width of space between nostrils equal to distance between 

 anterior edge of orbit and spiracle, 4}^ in head ; distance between an- 

 terior edge of mouth and tip of snout equal to space between anterior 

 edge of orbit and middle of spiracle, 3^ in head; distance from 

 angle of mouth to its anterior edge measured on upper jaw 2y2 

 in head. 



Teeth on jaws very small, in oblique rows, the obliquity more 

 pronounced toward posterior part of jaws ; rows on upper jaw 

 widely spaced posteriorly. Teeth of upper jaw and of tip of the 

 lower, each with a long, sharply pointed, median cusp ; a smaller 

 cusp on the outer posterior edge, one or two similar small cusps on 

 the inner anterior edge, and a series of sharp ridges on the outer 

 side; posterior to tip of lower jaw the ridges are less apparent, the 

 central cusp grows smaller, the lateral ones larger, others being 

 added until the teeth become broad and flat with serrated edges. 

 Skin covered with a shagreen of minute, leaf-like prickles, each with 

 a strong, elevated midrib — some of them with a slight denticulation 

 on each side. 



Distance between origin of first dorsal fin and tip of snout equal 

 to 4% times the length of space between eye and anterior gill 

 opening ; fin highest behind the middle, where its height is contained 

 5j^ times in the length of base. 



Distance between first and second dorsals equal to 3^ times the 

 diameter of orbit ; base of second dorsal equal to twice its height ; 



aKpaT^Tjq, speechless. 



