COCCOSTEID.E. 
305 
1860. Homostms latus, E. von Eichwald,'Leth. Roesica, vol. i. p. 1549, 
pi. lvi. fig. 2. 
Type. Portion of median dorsal plate ; University Museum, 
Dorpat. 
The type species, known only from separately discovered bones 
Median dorsal plate broader behind than in front, the posterior 
margin only slightly convex; forwardly directed process of anterior 
dorso-lateral plate slender and pointed. 
Form. Sf Log. Lower Devonian : Livonia, and near Pawlowsx, 
Government of St. Petersburg. 
The following are plaster casts of the original bones from Livonia 
in the University of Dorpat, and were presented by Sir Roderick I. 
Murchison, K.C.B., a'bput 184^6. 
15142 a. The type specimen, being the middle and right lateral 
portions of the median dorsal plate, wanting all margins 
except the posterior ; described by Asmuss {op. cit. p. 35. 
no. 5) as “ scutum dorsale anterius,” and the posterior 
border regarded as anterior. 
15142 b. Imperfect left anterior dorso-lateral (Pander, fig. 2 n ), de¬ 
scribed by Asmuss (p. 36, no. 35) as right “ adminiculum 
laterale” of H. formosissimus. 
15142 C. Left postorbital (Pander, fig. 2% Agassiz, fig. 2), described 
by Asmuss (p. 38, no. 36) as right “ os incunneatum ” of 
H. latus. 
15142 d. More imperfect example of the same bone, showing the 
postero-lateral extension. 
15142 e. Middle and right lateral portion of hinder half of median 
occipital, the type specimen of H. latus, Asmuss (p. 36, 
no. 6), and described as left anterior portion of the “ scutum 
dorsale posterius.” 
15142 f. Middle portion of median occipital, the type specimen of 
H. cataphractus , Asmuss (p.36, no. 7), and determined as 
“ scutum dorsale posterius.” 
15142 g. Half of median occipital, and portion of adjoining left 
lateral occipital, probably the basis of Pander’s partial 
restoration (fig. 2 9 > 10 ); described by Asmuss (p. 37, no. 32) 
as right “ os multifixum ” with “ scutum dorsale poste¬ 
rius” of H. cataphractus. 
15142 h. Outer portion of left lateral occipital, probably employed 
x 
PART II, 
