922 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



iiitorscapula has a convex inferior margin and reminds one of the lower 

 mandihle of some cuttlefishes. The postscaj^ula is more decurved. 

 The ca?nosteon and hypercorucoid are connected toward the front at 

 the symphysis b\'^ the intervention of cartilage. 



The hvpercoracoid has a foramen which appears as a notch from 

 the outer side as the result of the overlapping of the ccenosteon b}^ 

 squamous suture. ))ut internally the bone extends forward and is sepa- 

 rated from the c(cnosteon 1)y a long luiguiform gap and intervening 

 cartilage or membrane. 



The fourth actinost is nuich broader in front than in the British 

 Museum skeleton and its posterior portion nuich more deflected and 

 wedged in between the hypocoracoid and styliform extension of the 

 postscapula, which is suturally connected with it as well as w ith the 

 h3q50coracoid; there is little cartilage between its anterior portion 

 and the liypocoracoid as well as third actinost. The third actinost 

 intervenes between the hypercoracoid and fourth actinost, quite 

 widely separating them, and has the same kind of union with the 

 fourth as with the third; the second is longer, and has an ol)long con- 

 vex articular surface; its sutures, though close, are w^ell defined; the 

 first actinost has a still larger, more oblong, and more convex articular 

 surface, and is so intimately connected with the h^'percoracoid that 

 the sutures are obliterated; it is, in fact, completely ''fused with" the 

 h3'percoracoid. 



The pelvic bones are connected wdth the postflected lowermost or sym- 

 physial angles of the coenosteons through the intervention of cartilage 

 and have lamellar extensions, separated 1)y fissures from the body of 

 the bone, which are connected by cartilage with a slightly defined ridge 

 of the hypocoracoid parallel with its anterior margin. The ventrals 

 are subabdominal and inserted in the pelvic bones some distance in 

 advance of the hinder ends of those bones. 



VII. 



The pectoral fins of the Opah are represented inclined downward 

 in Smitt's Scandinavian Fishes (I, p. 123, 1892), as they are in the old 

 article by Gunner. Boulenger remarks, "On examining the shoulder 

 bones on a skeleton of Lampris lima, I was struck by two things — first, 



(III, p. 521, 1901) the word is quoted under "55, Clavicle, Parker," and in a foot- 

 note the following remark is made: "I get this reference from'Owen's Comp. Anat. 

 Lectures (Vertebrates), p. 118. By some ichthyotomists the bone in question has 

 received the special name of Cujnosteon." The name was given by Bakker in his 

 "Ostcographia Biscium" (1822). Bakker thoughtthat theso-called clavicleof fishes 

 was more than the clavicle of other vertebrates, corresponding to the clavicle and 

 humerus together (Nee tamen claviculam solam facere, sed e clavicula etosse humeri 

 componi milii visum est, p. Ill), and consequently gave the name coenosteon (evi- 

 dently from Koivoi, common or shared in common, and odtiov, bone). The impli- 

 cation is certainly false, but tlie name itt^elf mav be retained. 



