350 
ACTINOPTEEYGTI. 
P. 442 a. Maxilla described and figured under the provisional name 
of C. tenuidens by the present writer, Geol. Mag. [41 
vol. ii. (1895), p. 151, pi. vii. fig. 8; Middle Purbeck, 
Swanage. Purchased, 1882. 
P. 6584. More imperfect maxilla ; Swanage. Purchased, 1891. 
36175. Right dentary provisionally named C. tenuidens ; Swanage. 
Purchased, 1861. 
40656-57. Two right dentaries of the same form, the second 
described and figured loc. cit. 1895, p. 151, pi. vii. fig. 7 ; 
Swanage. Purchased, 1867. 
P. 442. Similar left dentary; Swanage. Purchased, 1882. 
P. 969. Similar right dentary ; Swanage. Ecjerton Coll. 
P. 6360. Imperfect abraded head, exhibiting relatively large teeth 
and an especially large gular plate ; Wealden, Hastings. 
Beckles Coll. 
An imperfect head and pectoral fins of Caturus from the Kim- 
meridge Clay of Cap de la Heve, Havre, have also been described 
under the name of Pachycormus insignis , by H. E. Sauvage, Bull. 
Soc. Geol. Normandie, vol. xiv. (1892), p. 29, pi. ii. Another im¬ 
perfect head, apparently of Caturus, from the Oxford Clay of Yaches 
Noires, Normandy (Prevost Collection), is named Pachycormus macro- 
pomus by Agassiz, Poiss. Foss. vol. ii. pt. ii. (1844) p. 114. 
A well-preserved trunk of Caturus from the Lias of Walgau , 
Bavarian Alps, is described under the name of Lepidotus (Semio- 
notus ) macropterus by K. E. Schafhautl, Geogn. Untersuch. sudbay. 
Alpengeb. (1851), p. 98, pi. xx. fig. 27. A specifically indeterminable 
jaw from the Lithographic Stone of Bavaria is named Caturus 
hrcinchiostegus by Agassiz, Poiss. Eoss. vol. ii. pt. ii. (1844) p. 118. 
Nothing appears to be known of the so-called Caturus ovatus 
(Miinster, Neues Jahrb. 1839, p. 679) and C. hrevicostatus (Munster, 
ibid. 1842, p. 44) from Kelheim. 
The portion of dentary from the Chalk of Lewes named Caturus 
similis (L. Agassiz, Poiss. Eoss. vol. ii. pt. ii. 1844, p. 118, pi. Ixvi. a. 
fig. 9) does not belong to this genus, but probably to a Teleostean 
fish. The original specimen is numbered 4842 and was obtained 
from the Mantell Coll. 
Nothing is known of the so-called Amblysemius gracilis (L. 
Agassiz, Poiss. Foss. vol. ii. pt. ii. 1844, p. 165) from the Oolite 
of Northampton, said to be closely related to Caturus (loc. cit. 
p. 119). Another species, A. bdlovacinus or hellicianus (V. Thiol- 
