6^ 
(fet< r* 7 "' L J 0 ~, 
'V TPlUflTAfiPTn ?f. VO 
^tlo^ rVacj ')u/Gtcte(<;m 1*^=0 K 
__ r - ^ i < ./' • wvi \t ii ~~> 
Family TFEMATASPID.F. 
•/ 
Shield rounded or tapering, in front, abruptly truncated behind ; 
interorbital piece not fixed ; external surface covered with, punctate 
ganoine, the punctations often arranged in reticulating lines ; super¬ 
ficial tuberculations almost or entirely absent. ~ - 
jjJUU “ t/vvto-^9 
Genus TREMATASPIS, Schmidt. 
^mJL/ • "2-c~t‘ fLc ^W wt^oi A 
[Verhandl. russ.-kais. mineral. Ges. St. Petersburg, [2] vol. i. 
1866 , p. 233 .] S&. ca*-LUk.c~ IxcnJ&WcAr* ' 
Syn. (P) Stigmolepis, G. PL. Pander, Foss. Fische Silur. Syst. 1856, p. 53. 
Odontotodus, C. H. Pander, ibid. p. 75 (inappropriate). — 
'-X 
T 5 ,-r. 
7 ‘S 
Shield simple, the postero-lateral angles not produced into cornua ; 0 
a continuous ventral plate opposed to its posterior two-thirds. A 
circular depression immediately in advance of the orbital opening, f * 
with an antero-posteriorly elongated cleft in the centre; an oval/<3 W/Uk 
fossa, or cleft behind the orbital opening. 
In the ordinary state of preservation of the shield it is difficult to j ^ , ltmc / 
distinguish broken eminences and depressions from vacuities ; and 
it is quite possible that the post-orbital and lateral openings 
31. Fig. 32. G. 
Ficr 
X lw,. 
Fig. 31. Tremataspis sckrenki (Pander).—Outline of shield, dorsal aspect, 
after F. Schmidt. 
Fig. 32. Tremataspis schren/ci (Pander).—Outline of anterior portion of shield, 
ventral aspect, after F. Schmidt, 
described by Schmidt are due to features of this kind accidentally 
removed. The appearances are distinct in the original specimens, 
and, whether they be due to vacuities, eminences, or depressions, 
they are at present not readily interpreted. 
