DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 



453 



Tlif dorsal fin 1 if^ins, upon the snoul in the perpendicular from the anterior margin of 

 the lower eye. It is composed of from 99 to 104 simple rays (in 5 specimens), the longest 

 ol'wliirli in the posterior fourth of the fin; their length (9) nearly half that of the head. 

 The anal fin begins between the tips of the veul ral, close to the pent, and under the inser 

 tion of the pectoral. It is composed of T'.i to 84 simple rays, the longest in the posterior 

 fourth; their length (7i slightly more than one-third the length of the head. 



Tlic caudal is sessile, ion in lei I. t lie middle rays in length (17) nearly double the longest 

 dorsal raj s. 



The pectoral, present only on the colored siile. is inserted close t<> the branched open- 

 ing, its length (15) three-fourths thai of the head. 



The ventrals are upon the median ventral line, even in length (6), slightly shorter or 

 nearlj equal to the longesl rays of the anal. 



Color on the left side ashy brown, with numerous more or less distinct darker brown 

 spois. On the blind side white. Pectoral blackish, with traces of lighter transverse bands. 

 Radial formula: D. 99-103; A. 79-84. Lateral line, 92. 



The young form of Monolene described by Goode under the name Thyris pellucidus 

 (Fig. 359) is so remarkably distinct, that the description is given here: 



The length of the specimen described (No. 26005) is 72 millimeters. 



The height of the body (32) is about one-third of its length (without caudal), the least 

 height oi' the tail (7) one-fourteenth. The body is thin, pellucid, larval-like, divided into 

 three longitudinal tracts by depressions at I In- bases of the rows of interspinous processes, 

 as in Glyptocephalus. 



Tin; scales are small, thin, easily detached (none remain upon the specimen except a 

 tew in the lateral line). The number of transverse rows is estimated at 120, the number 



of rows above ami below the lateral line al the wiliest portion of the body 17 or IS. The 

 scales in the lateral line are provided with a large central canal. The lateral line is 

 straight on both side-,. 



flic head is very small: its length (18) contained about five and one-hall' limes iii the 



