G8 coxTi;ir.rn<.\s' TO NORTH AMERICAN ICHTHYOLOGY iv. 







the miter extremities : posterior convex ; inner straight a portion of their 

 length. Vent nils truncate, rounded. Snout produced, forming ;i 

 i.ninded |i-oininenee in front of the margins of the disk. Length from 

 the forehead !<-< than the width of the head. A line joining the wider 

 portions Of the disk passes nearer to the head than to the shoulders. 

 Tail more than twice us long- as the body, without a trace of keel above; 

 a Ion-' narrow expansion below has its origin opposite that of the spine, 

 and terminates in a keel which continues to the extremity, roughened 

 with small tubercles, with an irregular series of broad-based conical 

 tubereles on each side. A pair of large, compressed, erect tubercles 

 stands immediately in front of the caudal spine, and a similar one is 

 placed over the middle of the pelvic arch. These suggest a continuous 

 >eries in larger specimens. Three larger elongated tubercles, with 

 points directed backward, similar to those of I>. luitiala, occupy the mid- 

 dleof the shoulder girdle. ^loutli curved, six (.1-6 1} papilla? at the bot- 

 tom behind the teeth; two of these are in the middle in front, where 

 usually there is but one. Color light olive, probably greenish in life, 

 white below. .Distinguished from D. centrum by the prominent snout, 

 the shape of the tubercles in the middle of the back, and the narrowness 

 of the posterior portion of the disk. Length of body 1(5, tail 35.3, and 

 width of pectorals iMt.,") inches. Sent from the Sandwich Islands by 

 Andrew (iarrett. 



DAS in AT is SABIXA. 



tabina I.i'Mirur. .Jmiv. Ac.-nl. X.it. Sri. I'lul. iv, p. I"*.'. 



Tni'/nii .s. I'.i'nui Miill. ct l[r;ili'. I'l.-iuinstoilirli, p. \(\'.\. 

 li'inii 1 >iiiiii ; ril, Kl;isiiiol;uu-li. p. (ill?. 



|)i-k -iibcircular. Snout produced, blunt. Anterior margins of the 

 pectorals concave near the snout, becoming convex toward the broadly 

 rounded outer extremities ; hinder and inner margins convex, rpper 

 jaw \\ith a deep indentation, receiving a corresponding prominence on 

 the lower. Teeth ;it t he sides of t his indentation much larger, resem- 

 bling the molars of Ili-lci-ndunlns. Mouth with live papilhe. Tail less 

 t han t wiee ;is lung us the disk, tapering to a line point, rough \\ ith small 

 piiekles .ximilar to those scattered over the head and back, a cutaneous 

 ..insioii abo\c. mid a liroader, longei- one below. These end nearly 

 opposite riich oth.-i. the h.wer extends forward under the spine. AVith 

 a median row ol' tubercles on the dorsum and one or a pair on each 

 >houlder. Distinguished from tnhirciiltitn by the shape of the snout, the 

 p.ctor.ils, the shorter tail, the larger teeth, the greater curva- 



