DISCUSSION OF SPECIES AND THEIR DISTEIBUTION. 209 



Body compressed and elongate. Teeth on jaws, vomer, and palatines. Skull with 

 crest. A single, elongate dorsal; anal shorter; pectoral very small; ventrals thoracic. 

 Lateral line present. Gill membranes free from isthmus. Branchiostegals 7. No pseudo 

 branchise. No air bladder. Pyloric appendages numerous. Vertebrae more than 10+14. 



CORYPHvENA, Linnaeus. 



Coryphwna, Lixx i:rs. Syst. Nat., etl. x, 1758, I, 261. — CuviEB and VALENCIENNES, Hist. Nat. Poiss., ix, 



l'i'iS. — (ii'-xTiiKit. Cat. Fish. Brit. Mus., n, 404. — Jordan and Gilbert, loe. cit. 

 Lampugus, Crvn.ij and VALENCIENNES, op. cit., 317. — Gill, Proc. Acad. Nat. Sri., Phila., 1802, 127. 



Body elongate, covered with small, cycloid scales. Cleft of the mouth >blique, the 

 lower jaw projecting. Gardiform teeth on jaws and vomer and palatines; a patch ofvilliform 

 teeth on the tongue. Skull-crest much more elevated in adult than in young. Dorsal 

 many rayed, low, extending from nape nearly to base of caudal; anal similar, but shorter; 

 both without distinct spines; pectorals small; ventrals well developed, thoracic, I, 5, partly 

 received into a groove in the abdomen; caudal fin widely forked. 



Liitken has reviewed in his Spolia Atlantica the species of the genus Coryphwna, and an 

 abstract of his conclusions is here preseuted: 



The genus Coryphcena, the "Dolphins" as they are called by sailors, is one of those 

 peculiarly pelagic in its characteristics, and it is an example, more remarkable than any 

 other, of the extreme confusion which has resulted from the fact that a numbe. of really 

 limited existing species has been divided into a great number of nominal species, based 

 only upon differences of age and sex, individual peculiarities, different geographical locali- 

 ties, carelessly made drawings, incomplete descriptions, etc., a confusion which has been 

 wrongly charged to Cuvier. The mistake of separating the species into two genera, Cory- 

 phcena and Lampugus, has already been rectified by competent authority, and the number 

 of species believed to be well founded at the same time was reduced from 19 to G. lie is now 

 of the opinion that the number should not be more than 2, or at the most 3. The two time- 

 honored species of Linnaeus, the large Dolphin, "La Petite Dorrade" (ft hippurus), which 

 reaches a length of nearly 6 feet; and the little Dolphin, "La Petite Dorrade" {G. equisetis), 

 which rarely exceeds 2£ feet. In Spolia Atlantica, Liitken gives an extensive comparison 

 of these two species, having special reference to the changes which they undergo with age, 

 and those which, like the length of ft equisetis, are sexual ; and these variations have been illus- 

 trated by figures of the head, which are reproduced in this work. Most of the species de- 

 scribed and figured can, according to Liitken, be very easily assigned to the two cosmopoli- 

 tan species referred to, which have been often brought in by sailors, the only ones, in fact, 

 from which he has been able to get material for study. Liitken hesitates in his opinion 

 concerning G.pelagiea (azorica, sicula) of the Mediterranean, which has been accepted by 

 most authors who have studied the Mediterranean fauna, but which very probably does 

 not differ specifically from ft hippurus; at least, he felt obliged to regard as a young speci- 

 men of this species a little " ft pelayicw" from the Mediterranean, which, under that name, 

 was sent to him for examination by a museum in Italy. In support of his opinion that 

 there are really only two species of Coryphwna, he mentions two circumstances — one, that 

 Giinther, although he formally acknowledges more, actually refers all the specimens in his 

 own custody to these two species arid has not recognized any others; and again, that Liit- 

 ken himself has been able without difficulty to divide numerous specimens of young Cory- 

 phcena, from 18 to 02 millimeters long, caught by Scandinavian fishermen, into two series, 

 representing two species, and to refer these series to the two species before mentioned, and 

 to no others, to wit, most of them to ft equisetis, and a fewer number to ft hippurus. The 

 little Coryphcena* are so dissimilar to the adults that it is very easy that they should have 

 given rise to mistake, and thus it has happened that the young ft hippurus has been de- 

 scribed by Pallas under the name of C. faseiolata. Liitken, in the work referred to, ui\cs 

 comparative descriptions of the young individuals of both species in their successive states 

 ami in relation to their adult forms, and gives figures illustrative of his ideas, calling at 

 teution to the fact that the greater length of the ventrals in ft hippurus, and their point of 

 1980S— No. 2 14 



