PROTOSPHYRANA. 153 
3. Protosphyrena minor (Agassiz). Plate XXXII, figs. 1, 2. 
1837-44. Tetrapterus minor, L. Agassiz, Poiss. Foss., vol. v, pt. i, pp. 7, 91, pl. 1x a, figs. 9, 10 (non 
figs. 11—13). 
1888. Protosphyreena minor, A. S. Woodward, Proc. Geol. Assoc., vol. x, p. 321. 
1890. Protosphyrena minor, J. Felix, Zeitschr. deutsch. geol. Ges., vol. xlii, p. 299. 
1895. Protosphyreena minor, A. S. Woodward, Catal. Foss. Fishes B. M., pt. ili, p. 406. 
Type. 
Fragment of rostrum, probably from a Cenomanian zone; British 
Museum. 
Specific Characters.—Rostrum comparatively delicate and much elongated, 
attaining a length of at least 15cm.; the transverse section a depressed oval 
throughout its length, and the internal cavity extending a considerable distance 
towards the gradually tapering end; the external surface ornamented with coarse, 
closely-arranged, parallel longitudinal ridges, and its upper aspect marked with 
a median longitudinal groove, which does not obliterate the ornamentation. 
Description of Specimens.—This species is known only by portions of rostrum. 
The type specimen lacks the distal end, but this is shown in the original of 
Pl. XXXII, fig. 1. The proximal half, which is excavated by a relatively 
large central cavity, is always badly preserved. The longitudinal ridges of the 
conspicuous external ornament (fig. 2) sometimes anastomose and are sometimes inter- 
calated, while on the ventral surface (fig. 2 a) they occasionally pass into a well- 
marked reticulation. ‘Towards the blunt end of the rostrum the bone becomes 
nearly smooth, 
As already remarked (p. 95), the terminal caudal vertebre provisionally ascribed 
to this species by Agassiz, belong to a teleostean fish of the genus Ichthyodectes. 
Horizon and Localities—Zone of Holaster subglobosus : near Lewes, Sussex ; 
Burham, Kent. 
4. Protosphyrena stebbingi, sp. nov. Plate XXXITI, fig. 3. 
Type.—Portions of rostrum from zone of Holaster subglobosus; collection of 
W. P. D. Stebbing, Esq. 
Specific Characters.—Rostrum depressed into a flattened blade, probably 
attaiming a length of from 35 to 40 cm., with a basal width of 4 to 5 em.; upper 
surface rising to the middle line, where it 1s traversed by a longitudinal groove, 
which has a flattened, smooth floor and sharply-raised, tuberculated edges; ornament 
of this surface consisting of low, rounded, longitudinal ridges and rows of circular 
pittings ; the lateral edges ornamented with stronger ridges, which are partly 
longitudinal, partly oblique; the terminal portion with the flattened upper surface 
only longitudinally ridged, the lateral edges and lower surface smooth. 
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