282 Part III. — Ticentidh Annual Repot t 



side together have the form of an arrow-head with a broad shaft attached. 

 In the cod the same cavity has a form recalling that of a pair of lungs, 

 and the posterior parts of the inner surfaces are approximated to touching. 

 In the saithe they are separated. In one cod — viz., a male 94 cm. — in 

 which the two postclavicles had an unusual form, the thin bone plates 

 were irregularly excavated. Each showed a small cavity anteriorly, 

 while a little posteriorly of that there was a small oval hole in the left 

 plate. In the lythe this thin bony plate is practically absent ; it is 

 reduced to a narrow rim, sometimes absent from the anterior process, and 

 confined simply to the angle between the two articular processes. 



The angle between the anterior and posterior processes is larger in the 

 lythe than in the saithe, and greater in the saithe than in the cod. The 

 converse relation is seen between the three forms in the angle between the 

 posterior process and the large articular plate. 



WORKS CONSULTED. 



Allis. — " The Cranial Muscles and Cranial and First Spinal Nerves in Amia 

 calva," Journal of Morphology, Vol. xii., No. 3, Boston, 1897. 



Bruhl.— "Zur Osteologie der Knochenfischen," 150 fig. 11 Taf., Berlin, 1887. 



CuviER AND Valencienises. — " Histoire naturelle des Poissons," T. 1, Paris, 1828. 



GoETTE. — " Beitritge zur vergleichenden Morphologie des Skelet-systems der 

 Wirbelthiere," 3 taf, Aixhiu f. microscop. Anatomie, Bd. 16, Hft. 1, 

 pp. 117-152. 



V. Klein. — " Beitriige zur Bildung des Scliiidels der Knoclienfishe," Jahreslitfte 

 der Vereinsf. vaterh'indische Naturhunde in Wiirtlemherg, Stuttgart, 40, 41, 

 42 Jahrg, 1884, 1885, 1886. 



KoSTLER. — " Ueber Knochenverdickungen am Skelette von Knochenfischen,"' 

 Zeitschr. f. ivissenschaft. Zoologie, Bd. 37, 1882, p. 429. 



KtJHL u. VAN Hasselt. — " Beitriige zur Osteologie der Fische," in Kiihl's Beitrage 

 z. Zool. u. vergleich. Anat., 1820, 2 Abth. 



Kyle. — " Tlie Classification of the FlatFishes," Eighteenth Annual Report of the 

 Fishery Board for Scotland, Pt. III., for the j'ear 1899. 



Matthews. — "On the Structure of the Herring and other Clupeoids," Fifth 

 Annual Report of the Fishery Board for Scotland, p. 232. 



Pouchet. — " Du developpenient du Squelette des Poissons osseux," JoiD'Hrt? de 

 r Anatomie {Robin et Pouchet), 14Annee, 1878, p. 34 and p. 139, PI. IV.- 

 XIII. 



Sagemehl. — "Beitrage zur vergleichenden Anatomie der Fische," Morphologisches 

 Jahrhuch (von Gegenbaur), Leipzig, 9 and 10 Bd., 1884 and 1885. 



ScHMiD-MouNARD. — " Die Histogenese des Knochens der Teleostier," Zeitschr. f 

 ivissenschaft. Zoologie, Bd. 39, 1893, pp. 97-136, 4 Taf. 



V. Siebold u. Stannius. — Handbuch der Zootomie, 2ter Theil, Handbuch der 

 Anatomie der Wirbelthiere, Zweiter Auflage, Berlin, 1894. 



Stenhouse. — On the Anatomy and Osteology of the Pigfish (Agnopus leuco- 

 poecilns), 4 pi., Trans. New Zealand Institute, Vol. xxvi, (9), 1893, 

 pp. 111-119. 



Traquair.— "On the Asymmetry of the Pleuronectida3," Trans, Linnean Society 

 of London, Vol. xxv. 



