2 70 EXPRDITIOX OF THE "ALBATROSS," 1899-1900. 



1()1k>s of the dorsal and anal, if laid l)ack, nearly reach the end of those fins. 

 Ill I he liiiure, the dorsal reaches about the middle and the anal a little beyond 

 the middle. If the length of the lobes of dorsal and anal fin are of any impor- 

 tance, Day's figure of T. baillonii is certainly not the same as Riippell's C. quad- 

 ripundatus, which in other respects it somewhat resembles; but Daj^'s figure 

 does not show as great length of vertical fin lobes as he indicated in the descrip- 

 tion, nor does it show them as long as those described by Lacepede, but the 

 latter's figure is poor and does not show the fins as long as he describes them. 

 Day's T. russellii agrees better with Lacepede's figure of C. baillonii. The lobes 

 of the fin are not as long as Lacepede describes, but they are longer than Day's 

 figure of T. baiUonii, and the spots are much larger. Lacepede's description 

 and poor figure of C. baillonii are insufficient for the identification of the species, 

 but they show longer vertical fin lobes than are indicated by Cuvier it Valen- 

 ciennes and by Day for this species, and in this respect they are much more like 

 the T. russelli of Cuvier & Valenciennes and of Day. 



Cuvier & Valenciennes record four species of this group of Trachinotus with 

 black spots. Day includes them all in tw^o species and Jordan & Seale recognize 

 the same two species in Oceania. Under T. russelli, Jordan & Seale include 

 T. coppingeri Giinther. In the description and figure of this species Giinther 

 does not indicate that there are any spots. 



Comparisons of the descriptions and figures indicate that the names have 

 been incorrectly applied by Day, and his description and synonymy is somewhat 

 mixed. Three of the four species mentioned by Cuvier & Valenciennes are 

 valid. Day's T. russellii in part should become T. baillonii in the synonymy 

 of which T. russellii of C. & V. should be placed, and Day's figure and part of 

 his description of T. baillonii is probably Cuvier & Valenciennes's T. oblongus 

 to the synonymy of which T. coppingeri belongs, if it is a synonym of any species. 

 There are thus in these waters three valid species with black spots: T. baillonii 

 Lacepede, T. quadripunctatus Riippell, T. oblongus Cuvier & Valenciennes. 



In the collection there are two of the three species: T. baillonii and T. ob- 

 longus. 



The three species may be separated by the following key which is made up 

 from descriptions and figures and from specimens. 



'To tli(> syiinnymy of T. qiinrlripuiicUiliis (Rupi)f'll) belongs T. haiHonii Day in part, not figure. 



