188 



CALIFORNIA ACADEMY OP SCIENCES 



The hist two or three rays in tlie dorsal and anal fins are procjri'ssively shortened, .tjivint^ a 

 rounded eonlonr to the end of these fins. The last rays of eaeh are uniteil for tlu-ir whole length by 

 membrane to the caudal. In tinee specimens at hand tlu' second dorsal contains respectively 30, 31, 

 and 32 rays; the anal 29, 29, and 30.* 



Two pairs of filaments project from the free margin liehin<l the upper lip.diie in front of each 

 eye, the second i)air neaier the median line. A pair of similar lilaments on lower lip near symphysis. 

 No other lilaments on head or body; but pairs of inconsi>icuous thick lleshy !ol)es close in front of the 

 isolated sensory organs on the lower jaw, and on the sides and top of the head. 



The opercular spine, and the s]iines of the dorsal fm are u holly I'liveloped in the inteiiument. 

 They contain a central canal, which opens in a shidlow t,n-oove on the anterior face of the spine, at an 

 apjireciable tlistance below the tip. 



The gciui.s D((cior Jordan & Evermann (1898, pp. 2813 and 2325), of whicli 

 this species is tlie type, seems to have littlt; vahie, and is not here recognized. The 

 characters assigned arc tlie many rayed dorsal and anal fins, and the union of these 

 with the candal. (^ther species of 7%ilassophrij7ie have 10, 20, and 2(3 rays in the 

 dorsal fin; 18, 19, and 25 rays in the anal. It seems unwarrantable to distinguish 

 from these generically a species containing 30 to 33 rays in the dorsal and 29 or 30 

 in the anal. As regards union of the dorsal and anal fins with the caudal, this occurs 

 in varying degrees, and is not correlated with increased number of fin rays. 

 2\ niacnlosd (1). II, 19; A. 18) seems to have the fins wholly distinct; T. amazonica 

 (D. II, 20; A. 18) has them completely joined; T. reticulata (D. II, 20; A. 25) has 

 them almost wholly united. 



Measurements in Hundredths of Length without Caudal. 



Length to base of caudal in mm. 

 Lens>th of head 



(■ri-al(.sl width of head 



I ,rnL;th of snout 



I 'iameti'r of i'\t'ball 



lulcrorbital w idlh 



Length of maxillary 



(Iix-atest depth of boilv 



I >(|idi of caud.il peduncle 



•Snout lo Inst tioisal spine 



liase of second dorsal (to liase of last ray). 



Snout to fronl of anal 



Hase of anal (to base t)f last ray) 



Length of caudal 



Length ol pcctor.il ^Iroiu middK' of a.xil).., 

 Length of outer xx'utr.il ray 



134 

 27i 

 23 i 



4i 



2 



6 



•3 

 20 



5 J 

 -'5 

 61 



39 



16 



18 



9 



