ASPJDORH YNCHID2E. 
433 
is labelled Belonostomus ventralis , apparently in Agassiz’ hand¬ 
writing ; but this species has not been adequately defined 
(L. Agassiz, Bericht. Yersamml. deutsch. Xaturf., Jena, 1836, 
p. 127, and Poiss. Boss. vol. ii. pt. ii. 1844, pp. 143, 297), and 
the type specimen is said by A. Wagner to be specifically inde¬ 
terminable (Abh. k. bay. Akad. Wiss., math.-phys. Cl. vol. ix. 1863, 
p. 692):— 
P. 7577. Remains of head and greater portion of trunk of a fish in 
counterpart, noticed and figured as Serpens marinus in 
J. J. Baier’s 4 Monumenta rerum petrificatarum ’ (Xurem- 
burg, 1757), p. 10, pi. vi. fig. 4 ; Lithographic Stone, 
Solenhofen, Bavaria. Though not satisfactorily shown, 
it seems probable that the much-attenuated rostrum 
projected in advance of the mandible, in which the pre- 
symphysial bone is distinctly separated from the dentary 
by suture. The scales are comparatively robust, and some 
exhibit a tuberculated or rugose ornament. 
History unknown. 
Belonostonms dorsetensis* sp. nov. 
[Plate XIV. fig. 2.] 
Type. Imperfect skull and mandible ; British Museum. 
A species of moderate size known only by the head, which 
attains a length of about O’ 115. Rostrum much attenuated and 
projecting for some distance in advance of the anterior extremity 
of the mandible ; the blunt anterior extremity of the dentary bones 
suturally united with a slight excavation in the presymphysial bone, 
and the median series of widely-spaced teeth on this bone relatively 
large ; ornament of cranium consisting of fine rugae of ganoine, 
that of the mandible only of structural rugae. 
Form. Sf Log. Ivimmeridge Clay : Dorsetshire. 
P. 6175. The type specimen shown of the natural size in PI. XIV. 
fig. 2, comprising the vertically crushed cranium imper¬ 
fect behind, the left ectopterygoid ( ecpt .) and imperfect 
dentary {cl.), and the presymphysial bone ( ps .) ; Kimme- 
ridge Clay, Weymouth. The rostrum is shown to extend 
considerably in advance of the dentigerous premaxillae and 
exhibits a longitudinal groove on its inferior aspect ; the 
presymphysial bone is dentigerous throughout its length. 
The ectopterygoid is granulated on its inner face and 
bears a single row of closely arranged, elongated conical 
2 F 
PARI III. 
