41 0 
Undina penicillata, Munster. 
1834. Undina penicillata, G. von Munster, Neues Jalirb. p. 539. 
1842. Coelacanthus striolaris, G. von Miinster, Neues Jalirb. p. 40. 
[Palaeontological Museum, Munich.] 
1842. Coelacajithus kohleri, G. von Munster, ibid. p. 40. [Ibid.] 
1842. Coelacanthus striolaris, G. von Munster, Beitr. Petrefakt. pt. v. 
p. 57, pi. ii. figs. 1, 3, 5, 6, 8-10, 12, 14, 16. 
1842. Coelacanthus kohleri, G. von Miinster, ibid. p. 59, pi. ii. figs. 2, 4, 
7, 11, 13, 15, 17. 
1844. Undina striolatus and U. kohleri, L. Agassiz, Poiss. Foss. vol. ii. 
pt. ii. p. 171. 
1863. Undina penicillata, A. Wagner, Abli. math.-phys. Cl. k.-bay. 
Akad. Wiss. vol. ix. p. 696. 
1869. Coelacanthus penicillatus, K. von Willemoes-Sulim, Palmonto- 
grapbica, vol. xvii. p. 80, pi. x. figs. 2, 3, pi. xi. fig. 3. 
1871. Coelacanthus harlemensis, T. C. Winkler, Archives Mus. Teyler, 
vol. iii. p. 101, pi. iv. [Teyler Museum, Haarlem.] 
1881. Coelacanthus harlemensis, B. Vetter, Mittheil. k. mineral.-geol. 
Mus. Dresden, pt. iv. p. 13, pi. ii. fig. 4. 
1887. Undina penicillata, K. A. von Zittel, Ilandb. Palseont. vol. iii. 
p. 175, woodc. fig. 177. 
1887. Undina acutidens, K. A. von Zittel, ibid. p. 175, woodc. fig. 1776 
(fig. of scales only). 
1888. Undina penicillata, 0. M. Peis, Palaeontograpbica, vol. xxxv. 
pp. 30, 36, pi. ii. figs. 5, 6, 9, 10, pi. iv. figs. 3, 4. 
1888. Undina acutidens, 0. M. Reis, ibid. pp. 10, 36, pi. i. figs. 2-6, 
8-24. [Palaeontological Museum, Munich.] 
Type. Nearly complete individual ; Palaeontological Museum, 
Munich. 
The type species, attaining a length of about 0*4. Trunk robust, 
but elongated : head and opercular apparatus occupying somewhat 
less than one quarter of the total length. Fin-rays slightly ex¬ 
panded in the articulated distal half; dorsal fins well developed, the 
first consisting of about 10 relatively stout rays, the second and the 
anal each comprising at least twice that number of more slender rays ; 
principal caudal fin comprising about 18-20 stout rays above and 
below. Jugular plates four times as long as broad, covered with 
sparse elongated tubercles ; operculum, cheek-plates, and mandible 
delicately tubereulated. Scales ornamented with numerous irre¬ 
gularly and closely arranged, elongated tubercles. 
The occasional smooth appearance of the jugular, operculum, and 
cheek-plates of this species is doubtless owing to post-mortem 
accident before or during fossilization. The same remark probably 
applies to the varying presence or absence of the larger teeth among 
the smaller ones. 
