DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 



19 



The caudal originates at a distance from the end of tlie .second dorsal about equal to 

 the height of the anal; it is divided by a notch into a short upper portion, who.se lengtli is 

 very little more than the greatest height of first dorsal, and a very low aud long lower por- 

 tion, the longest margin of which is nearly twice as long as the snout. The distance of the 

 caudal from the end of anal base e<iuals one-fourth the length of second dorsal base. 



The di.stance of pectoral from snout is contained five times in total length : the length 

 of pectoral equals nearly twice the width of its base, and is a little more than one-ninth of 

 total length. The greatest width of pectoral equals twice the height of anal, and is con- 

 tained twelve and one-third times in total length. 



The origin of the ventral is slightly in advance of the end of first dorsal, and is beliind 

 the middle of total length a distance equal to the interorbital space. The length of ventral 

 equals that of lower jaw. The width of ventral base equals that of pectoral base : the great- 

 est width of ventral slightly exceeds its length. 



Color. — When received the margins of the tins were apparently faded; the original 

 color was probably grayish brown with dark margins on all the fins except the fiist dorsal. 

 Capcllo states that his example was chestnut-brown. 



The iSTational ^Museum received February 12, 1SS.3, in tlie fresh state, a fine example of 

 a species of Psendotriacis, which came ashore at the Amagansett Life-Saving Station on 

 Long Island, February 8, 1883, forwarded by Mr. J. B. Edwards, keeper of the Suffolk 

 Life-Saving station. [The specimen is tlie one liere described.] 



No species of the genus Pseudotrincis has heretofore been recorded in the western At- 

 lantic. 



The gills and mouth were obstructed by sand. The only parasites discovered on tlie 

 animal were a couple of isopods, one of which was found in the eye cavity. 



iMEA.srRE.MENTS. 



Total lengtli 



Body : 



Height at origin of first dorsal 



Height at origin of ventral 



Height at origin of second dorsal 



Height at emi of ventral base 



Least height of caudal peduncle 



Width at origin of first dorsal 



Head: 



Distance from the tij) of snout to first gill 

 opening : 



Horizontally 



Obliquely 



Distance from tip of snout to last gill open- 

 ing 



Distance from first gill opening to fifth . . . . 



Distance from first gill opening to fourth . . 



Distance from first gill opening to third . . . . 



Distance from first gill opening to .second.. 



Height of first gill opening 



Height of second gill opening 



Height of third gill opening 



Height of fourth gill opening 



Height of fifth gill opening 



Height at angle of mouth 



Height at first gill opening 



Height at base of pectoral 



Distance from tip of snout to eye (horizon- 

 tally) 



Distance from tip of snout to nioulh (hori- 

 zontally) 



MiUi- 



meters. 



Hun- I 

 dredths 



of 

 length, 



Head—Continued. 



Distance from tip of anout to inontli (ob- 

 liquely) 



Distancefromtipof siHMit toan^lpof inoutli 



(horizontally) 



Distance fromtipof snout to angle of mouth 



(obliquely) , 



Distance from tip of snout to spiracle (hoi-- 



izontally) , 



Greatest length of spiracle 



Length of opening of spiracle 



Distance from eye to spira<'le 



Distance from angle of mouth to spiracle . . 



Leogth of orbit 



Length of eye 



Width of mouth 



Length of upper jaw to angle of mouth- . . 

 Length of lower jaw to angle of mouth. .. 



Distance from mouth to nostril 



Distance between nostrils 



Distance between eyes 



Distance between eyes on cartilage 



Distance between spiracles 



First dorsal : 



Distance from snout 



Length of base 



Greatest height 



Sf.cond dorsal: 



Distance from end of first dorsal 



Distance from snout 



Length of base 



Milli- 

 meters. 



Hun- 

 dredths 



of 

 length. 



5.0 

 9.5 



