CCELACANTHIDIE. 
413 
Undina (?) barroviensis, A. S. Woodward. 
1890. Undina barroviensis, A. S. Woodward, Ann. Mag. Nat. Hist. [6] 
yol. y. p. 436, pi. XYi. fig. 5. 
Type. Fish, wanting paired fins ; British Museum. 
An imperfectly definable species, known onH by the specimen 
mentioned below. Fin-rays not expanded distally, with more 
widely-spaced articulations than in the typical species ; principal 
caudal fin consisting of about 16-18 rays above and below. Scales 
ornamented with few, large, irregular, elongated tubercles, some¬ 
times subdivided transversely. 
Form. § Log. Lower Lias : Barrow-on-Soar, Leicestershire. 
21335, P. 3343. Type specimen, in counterpart, described and 
figured, loc. cit. Purchased, 1847, and Enniskillen Coll. 
The specimens mentioned below probably indicate an undetermined 
species of Undina, as remarked by the present writer in Proc. Geol. 
Assoc, vol. xi. (1890), p. 292 :— 
P. 4277. Pterygo-suspensorial bone figured, loc-. cit. pi. iii. fig. 6 ; 
Stonesfield Slate, near Oxford. Enniskillen Coll. 
P. 3793. A more imperfect example of the same bone; Stonesfield 
Slate. Enniskillen Coll. 
P. 4277 a. Jugular plate, resembling a specimen figured by C. Pre- 
vost, Ann. Sci. Nat. vol. iv. (1825), pi. xviii. fig. 20. 
Enniskillen Coll. 
Genus L1BYS, Munster. 
[Neues Jahrb. 1842, p. 45.] 
Fin-rays broad and robust, often expanded, and closely articulated 
in the distal half; the preaxial rays of the first dorsal and caudal 
fins granulated. Parafrontal and circumorbital bones with a regular 
series of very large, broad vacuities or superficial excavations ; scales 
ornamented with irregularly disposed, elongated tubercles. 
This genus is closely related to Undina, and was first elucidated 
by 0. M. Beis (Pakeontographica, vol. xxxv. 1888, p. 37.). The 
vacuities or excavations in the parafrontal and circumorbital bones 
probably imply a large development of the mucus-secreting follicles 
of the sensory canals. 
