7<> i .i.viiiir.rrmxs TO NORTH AMKIJICAN ICHTHYOLOGY iv. 



1) LSEB M IS IIASTA'I A. 



.,// Imxliitit I>rKay. NV\v York F.-mna. l'i-li. p. ::7.">. pi. (M, tig. Vil49. 



fawfato Storer, 8 a. l'i-!i. \. AHUT. ]>. 'Jill. 

 ; ata iMiim-i.l, KluMiKil.ruiirh. p. .".'.I','. 



Di>l. quadrangular, about one-fourth wider than long ; anterior mar- 

 gins nearly straight, meeting in a blunt angle fm the end of tin- snout, 

 . -Hived Dear the outer angle to meel the slightly convex posterior mar- 

 gins: inner lenders convex; outer and hinder angles rounded. Ven- 

 Irals almost ciitin-ly covered by the pectorals, hinder margins convex. 

 1 more than one and a half times the length of the disk, low-keeled 

 0,1 the upper side, a Ion--, broad membranous expansion below, rough- 

 ened \vith small asperities, one or more serrated spines, liody smooth 

 in \onn.u, very old with scattered small asperities. A row of narrow 

 compi-essed tubercles aloii^- the middle, of the back and on the base of 

 tiie tail ; the points of these tubercles are depressed and directed back- 

 ward. On each shoulder, parallel with the median, there is a shorter 

 row, the length of which varies according to the, age of the individual, 

 ith with three papilla-. .Jaws with more curvature than those of 

 mra and less than those of xnl'um. Young without tubercles. 

 < ..lor bluish or olivaceous brown, darker on dorsum and tail, light on 

 lower surface. Measurement of a young specimen: length of disk S..", 

 \.idth 10, and length of tail 1-1 inches. An adult male measured L'O 

 inches across the pectorals and 1(1 in length of body. The museum con- 

 tain.- >peci:neii> from Florida, Cuba, IVrnambueo, and Rio , Janeiro. 



DASIMATIS r,i;::\is. 



1880, P.iill. Mn-v romp. /"!. vi, 171.) 



l>i>!> (piadrangi'.lar, a lit tie wider than long. Anterior margins nearly 

 .1. curved Dear the Outer extremities to meet the con vex posteriors, 

 meeting iii a blunt angle on the end of llie snout. Outer and posterior 

 I pectorals round, without trace of angles. Yentrals bioad, 

 iruiicate, with angles rounded. Tail less than one and a half times the 

 lei.gl h o!' the disk, tapering to an acute point, depressed as far as to the 

 ..pine, thence cMmpreed to the end of the cutaneous fold, and round 

 point to the tip, u ith a short elevated membraneous expansion 

 behind the >pine. and a longer and wider one on the lower side, extend- 

 below the former and the spine. The expansions have their hinder 

 remit ies oppo-ed : i hey end quite abruptly and an- widest near the 



