542 Memoir Sears Foundation for Marine Research 



(palatine) plates about twice as long as anterior plates, about V3 (66 "/o) as long as eye 

 and about 1.6 times as long as broad; exposed part subtriangular, weakly convex 

 transversely, outer margin slightly irregular but without definite radial ridges, inner 

 anterior part with one low rounded prominence (tritor). Lower (mandibular) plates of 

 shape shown in Fig. 121, the anterior margin deeply excavated with prominent outer 

 and inner angles; without radial ridges but with one round or oval swelling (tritor) 

 near outer anterior corner. 



Dorsal spine 8" as pictured, about as long as distance from tip of snout to rear 

 edge of eye, reaching about to apex of first dorsal fin; outer part free, the rear face 

 with two rows of sharp thorns pointing toward base, as in Chimaera. First dorsal fin 

 with angular apex and moderately concave posterior margin; its base (from origin of 

 spine to bottom of interdorsal notch) about 2/3 {(ii^-dd %) as long as height along 

 anterior margin. Distance between first dorsal and first sensible elevation of second 

 dorsal a little more than half (52—53 "/o) ^s long as anterior margin of first dorsal. 

 Second dorsal fleshy with only outer parts of horny rays visible; upper margin nearly 

 straight; height at midlength a little less than Vs (18-19 "/o) ^s great as length of 

 anterior margin of first dorsal; about equally great at anterior end and little greater 

 at rear end; posterior outline of second dorsal curving abruptly downward." No 

 definite interspace between second dorsal and upper origin of caudal. Caudal lanceolate, 

 tapering to narrow tip, prolonged as a short filament;*^ maximum height of caudal above 

 axis a little less (80 "/g) than height of second dorsal at posterior end; its extreme length 

 to most posterior ray between 4.5 and 4.75 times as great as its height; caudal below 

 axis a little narrower (about 80-81 "/o) than above axis; most posterior ray of lower 

 side posterior to most posterior ray of upper side by a distance about equal to length 

 of upper side; origin of lower side of caudal indefinite in position, preceded by a low 

 fleshy ridge distinguishable forward for a distance about as long as upper side of 

 caudal. Pelvic fins with weakly convex anterior margin, slightly more convex distal 

 margin, subangular outer corners, and gradually rounded posterior (inner) corners; 

 length of pelvics along anterior margin about as great as distance from tip of snout 

 to rear margin of eye; pelvics originating posterior to axils of pectorals by a distance 

 about 1.2— 1.3 times as great as distance from tip of snout to origin of pectorals. 

 Pectoral fins about 1.3-1.5 times as long as distance from tip of snout to pectoral 

 origins; tips, when laid back, falling a little short of origins of pelvics on specimens 

 seen, but perhaps reaching to origin of pelvics in some cases; anterior margin of pec- 

 torals weakly convex; distal margin weakly concave; apex narrowly rounded; inner 

 corner broadly so; inner margin with conspicuous notch at axil. 



Secondary Sexual Characters. Female without prepelvic openings. Ventral pad a 

 little shorter than distance from tip of snout to front of eye, its anterior end posterior 

 to bases of pelvics by a distance about as long as eye. 



80. The spine has lost its tip on our specimens. 



81. The margin of the second dorsal is deeply indented on our specimen about midway of its length, no doubt as result 

 of injury. 



82. The filament is less than half as long as the eye on our specimen, though seemingly intact. 



