GARMAN : NEW PLAGIOSTOMIA AND CHISMOPNEA. 255 



compressed, hooked, striate-based, buttressed in front — above the vertebrae from 

 the back of the head to the second dorsal fin ; no larger tubercles around the 

 eyes or the spiracles. Ventral fins broad, anterior portion of moderate length, 

 notch of medium depth, containing four digits. 



Color of the back uniform slaty or leaden-brown, with small spots of black. A 

 white spot on each side of the tail at one-fourth of the distance from the base to 

 the end of the second dorsal fin, and a faint spot of light color near the middle of 

 the hinder half of each pectoral fin. Lower surface of disk white, smooth; lower 

 side of tail darker along the middle. 



Type Cat. 1261 M. C. Z., from Friday Harbor, Washington. 



The name is given in honor of Dr. Trevor Kincaid, to whom we are indebted 

 for knowledge of the species. 



Chismopnea. 

 Chimaera barbouri, sp. nov. 



As compared with other species of the genus the body of this one is moderately 

 stout and the tail is somewhat less elongate. A feature that at once serves to 

 distinguish this species is the shape and height of the second dorsal fin ; as on 

 Chimaera mirabilis of Collett, this fin is high anteriorly and posteriorly, and the 

 outline is convex, while in the middle of its length there is a deep concavity where 

 the height of the fin is less than half as much, the lowest portion being reached by 

 a gradual descent from either end. The eye is large ; it occupies nearly one-third 

 of the length of the head. The snout is massive ; its length is greater than that 

 of the eye. The dental plates are thin and sharp on their outer edges. In each 

 vomerine plate there are five enamel rods, as in C. monstrosa* but in C. barbouri, 

 the inner one of the five, the longest and the strongest, stands at a little distance 

 from the others. Each palatine plate has a pair of prominent longitudinal tritors 

 on its side near the inner edge, and on each mandibular plate there is a single 

 prominence not so elongate as those to which it is opposed on the roof of the 

 mouth. These lateral tritors, being the results of wear on the sides of the enamel 

 rods, only appear in older individuals, and of course are not present in the younger 

 ones, which are provided with the marginal tritors on the edges of the plates, on 

 the ends of the enamel rods, as was pointed out for other species of Chimaera in 

 the article on the Chismopnea, 1904, Bull. M. C. Z., 41, p. 258. In a measure 

 the palatine and mandibular plates of the specimen before us resemble those of 

 some Callorhynchi, as may be seen by comparing with figures 1-4 of Plate 6 of 

 the mentioned article. 



In the first dorsal fin the spine is triangular ; it bears hooked spinules on the 

 hinder angles. The dorsals appear to be widely separated, but they are united by 

 a very low fold of membrane. The height of the first dorsal, from origin to apex, 

 is much less than the entire length from the second dorsal to the origin of the 

 first. The greatest length of the rays of the second dorsal approximates the 

 length of the eye, which is about twice the length of the rays in the depth of 

 the concavity of the fin. In height the supracaudal fin is somewhat less than 



