46 Pisces 
V. PISCES. 
ACANTHODII. 
Acanthodes marshi, p. 93, pi. vi, fig. 3 and pi. vii, figg. 1 & 2, and beecheri , 
p. 94, fig., spp. nn., Eastman, Bull. Mus. Harvard xxxix, Coal 
Measures, Mazon Creek, Illinois. Also J. Geol. x, pp. 536 & 537, figg. 
Marsdenius , g. n. ( Diplacanthid .), "Vellburn, P. Yorksh. geol. Soc. (2) xiv, 
p. 466; M. summiti , and acuta , spp. nn., id. ibid. pp. 467 & 468, 
Carboniferous Pendleside limestone, Yorkshire. 
ICHTH Y OTOMI. 
Cladodus formosus , sp. n., 0. P. Hay, Amer. Geol. xxx,, p. 373, fig., 
Devonian of Colorado. 
INCERT7E SEDIS (ICHTHl r ODORULITES). 
E. Mariani, Atti Mus. Milano xli, p. 437, fig., describes some ichtliyodoru- 
lites from the Chalk of Lombardy. 
J. Y. Rohon, SB. Bomisch. Ges. 1901, No. xvi, 31 pp., figg., 2 pis., has a 
contribution to the anatomy and histology of the Psammosteidce. 
Ganosteus, g. n., near Psammosteus , for G. tuberculatus and stellatus , spp. 
nn., Devonian of Russia. 
Ctenacanthus , Ag. On species from the Carboniferous of the Mississippi 
Valley, Eastmann, Bull. Mus. Harvard xxxix, pp. 79-92, figg.; C. 
longinodosics, p. 78, pi. v, fig. 2, lucctsi , p. 80, pi. vi, fig. 1, venustus , 
p. 81, pi. iii, fig. 2, decussatus , p. 84, pi. vi, fig. 2, and solidus , p. 90, 
pi. vii, fig. 3, spp. nn., id. ibid.; C. tenuistriatus , Ag., recorded from the 
Carboniferous limestone of Vise, Belgium, P. Destinez, Bull. Soc. 
geol. Belgique xxix, p. 108. 
Coelodus latus, sp. n., Leriche, Ann. Soc. geol. Nord xxx, 1901, p. 154, 
pi. v, fig. 1, Lower Montian of Mt Aime, Marne, France. 
Gyracanthus falsiformis, sp. n., Traquair, Mem. geol. Surv. U. K. f. 1901, 
p. 181, Calciferous sandstone near Dunse. 
Erismacanthus foi'mosus , sp. n., Eastman, Amer. Natural, xxxvi, p. 850, 
fig., Carboniferous, St Louis, Missouri. 
CYCLOSTOMI. 
W. II. Gaskell, J. Anat. Physiol, norm. path. (2) xvi, pp. 164-208, figg., 
continues his studies on Ammocoetes with reference to the origin of 
vertebrates, dealing specially with the origin of the auditory organ 
and the meaning of the vuith cranial nerve. 
N. Iv. Koltzoff, Bull. Soc. Moscou 1901, pp. 259-589, has a memoir on 
the development of the head of Petromyzon planeri. Also published 
separately (Moscow, 1901, 8vo). 
R. Bolster, Acta Soc. Faun. Fenn. xxix, No. 2, investigates the nerve- 
cells of Petromyzon fluviatilis. 
A. Dendy, P. R. Soc. London lxix, pp. 485-494, figg., and Zool. Anz. xxv, 
pp. 511-519, figg., writes on a pair of ciliated grooves in the brain of 
Ammocoetes , apparently serving to promote the circulation of the fluid 
in the brain-cavity. 
C. W. Greene, Amer. J. Physiol, vi, pp. 318-324, writes on the absence of 
regulative nerves for the systematic heat in Bdellostoma stouti. 
A. M. Reese, P. Ac. Philad. 1902, pp. 85-112, pis. iv-vii, writes on the 
structure and development of the thyroid gland of Petromyzon. 
