PACHYC0RMID2E. 
407 
Protosphyrsena tenuirostris, A. S. Woodward. 
1860. Saurocephalus striatus , V. Kiprijanoff (errore), Bull. Soc. Imp. 
Nat. Moscon, yoI. xxxiii. pt. i. p. 666, pl.x. fig. 3. 
1895. Protosphyrcena tenuirostris, A. S. Woodward, Geol. Mag. [4] 
vol. ii. p. 211, woodc. fig. 1. 
Type. Rostrum ; Woodwardian Museum, Cambridge. 
Rostrum much elongated and slender, somewhat flexed upwards 
shortly in advance of the vomerine teeth, and attaining a length of 
about 0*24 with a transverse diameter of 0*027 at its base where 
the vomerine teeth are implanted ; transverse section remarkably 
cylindroidal throughout its length, slightly depressed in its middle 
portion; external surface marked by fine longitudinal ridges. 
A diagrammatic outline of the left side-view of the type specimen 
is shown of half the natural size in fig. 41, no. 1 (p. 403), and 
transverse sections are given, ibid. nos. 1 a-c. The Russian speci¬ 
men described by Kiprijanoff is slightly more attenuated. 
Form. Sf Loc. Cenomanian (Cambridge Greensand): Cambridge¬ 
shire ; Kursk, Russia. 
Not represented in the Collection. 
Protosphyrsena keepingi, A. S. Woodward. 
1895. Protosphyrcena keepinqi, A. S. Woodward, Geol. Mag. [41 vol. ii. 
p. 212, woodcut fig. 4. 
Type. Portion of rostrum ; Woodwardian Museum, Cambridge. 
Rostrum remarkably stout and short, circular in transverse 
section, only slightly flattened on the top at its base; external sur¬ 
face ornamented with reticulating rugae. 
A diagrammatic outline of the left side-view of the type specimen 
is shown of half the natural size in fig. 41, no. 4 (p. 403), and 
transverse sections are given, ibid. nos. 4 a, b. 
Form. Sf Log. Cenomanian (Cambridge Greensand); Cambridge¬ 
shire. 
Not represented in the Collection. 
Protosphyrsena ornata, A. S. Woodward. 
1895. Protosphyrcena ornata, A. S. Woodward, Geol. Mag. [4] vol. ii. 
p. 212, pi. viii. fig. 7. 
Type. Imperfect rostrum; Woodwardian Museum, Cambridge. 
Rostrum much elongated and attaining a length of about 0*2 
with a transverse diameter probably of 0*02 or 0*025 at its base 
where the vomerine teeth are implanted ; vomerine area elongated, 
