38 Pisces. 
V. PISCES. 
ICHTHYOTOMI. 
E. D. Cope, Amer. Natural, xlvii, 1893, p. 999, writes on the position of 
the Cladodont Sharks. 
B. Dean, J. Morpjiol. ix, 1894, pp. 87-112, pi. vii, deals with the 
morphology of Cladoselache , n. g. (for Cladodus mirabilis , Newb., 
and A.fyleri , Newb. [foss.]). 
i Symmorium , n. g., allied to Cladodus , Ag., for S. reniforme n. sp. (foss.) ; 
Cope, Amer. Natural, xlvii, 1893, p. 999, Coal Measures of Illinois. 
INCERTiE SEDIS. 
Nemacanthus monilifer , Ag., on a spine from the Rhaetic ; A. S. Wood- 
ward, Ann. Nat. Hist. (6) xii, 1893, p. 284, pi. x, fig. 6. 
OYCLOSTOMI. 
On the affinities and systematic position of the Marsipobranchii ; 
G. B. Howes, P. Liverp. biol. Soc. vi, 1892, pp. 122-147, pis. viii-x. 
G. Retzius, Biol. Unters. (2) v, 1893, pp. 55-70, pis. xxiv-xxvii, further 
contributes to the anatomy of Cyclostomes. 
S. M. Gage, Wilder Quart.-Cent. Book, pp. 421-493, 7 pis., makes an 
exhaustive study of the freshwater Lampreys of New York 
( Petromyzon branchialis and unicolor ). 
On the horny teeth ; M. Jacoby, Arch. mikr. Anat. xliii, 1894, pp. 117- 
148, pi. vi. 
On the brain ; R. Burckiiardt, Anat. Anz. ix, 1893, pp. 152-155, fig. 
On variations in the respiratory organs of Petromyzon jiuviatilis and 
Myxine glutinosa ; G. B. Howes, P. Zool. Soc. London, 1893, 
pp. 730-733, fig. (1894). 
On the pancreas of Ammoccetes ; C. v. Kupffer, SB. Ges. Munchen, 
ix, 1893, pp. 37-58, figg. 
"F. C. Studnicka, in a separately- published pamphlet (Prague : 1893) 
deals with the parietal organs of Petromyzon planer i. 
On the development of the vertebral column of Cyclostomes ; C. Hasse, 
Zeitschr. wiss. Zool. lvii, 1893, pp. 290-305, pi. xvi. 
On the development of the head of A mmoccetes planeri ; C. v. Kupffer, 
Studien zur vergleichenden Entwicklungsgeschichte des Kopfes der 
Kranioten, ii, 1894. 
J. W. Kirkaldy writes on the head kidney of Myxine ; Quart. J. Micr. 
Sci. xxxv, 1894, pp. 353-359, pi. xxiii. 
On the early stages of segmentation of Petromyzon marinus ; F. W. 
McLure, Zool. Anz. xvi, 1893, pp. 367, 368, & 373-376. 
On the first stage of the fecundated egg of Petromyzon Jiuviatilis ; 
K. Y. Herfort, Anat. Anz. viii, 1893, pp. 721-728, figg. 
