Editorial Comment. 245 
None of the species described by Prof. Traquair is equal in 
age to Scaphaspis (so-called) from the Lower Ludlow of 
Herefordshire so that they do not extend the history of fishes, 
either in horizon or in time, beyond our previous knowledge. 
But the fossils are remarkable because they add some new 
forms to the scanty ichdiyic forms of these ancient rocks. 
Among the Heterostraci (Lankester), these fossils give us 
for the first time some idea of the form of the Coelolepidse 
which have hitherto been only known by scattered scales. 
Two species are referred to the genus Thelodus of Agassiz. 
(T. scoticus and T. planus.) They measure about eight 
inches in length and are preserved chiefly as outlines on the 
stones, which presents rudely but unmistakably the forms of 
fishes, but gives almost no details of their structure. 
To these Prof. Traquair has been able to add a new genus, 
which, from the country in which the remains were found, he 
calls Lanarkia, with three species (L. horrida, L. spinosa, L. 
spinulosa). These also are presented as outlines on the stone, 
but are characterized by a dermal armature of sharp, conical, 
hollow spines, a character previously unknown on the Hete- 
rostraci. There were also small fishes scarcely equalling 
Thelodus in size. 
These five species constitute a very important addition to 
our scanty heterostracan fauna and enable us to realize bet- 
ter than was previously possible the general form of these 
fishes and by inference that of their relatives, though Prof. 
Traquair's restoration (fig. i), is more suggestive of 
Cephalaspis than of Pteraspis. 
Ateleaspis, so named from the imperfection of its cephalic 
shield, is typified by a very ill-preserved specimen, whose 
generic description is chiefly summed up in the words 
"dermal covering in part consists of small polygonal plates, 
while behind the pectoral lin-flaps it takes the form of flat 
rhombic sculptured scales." The general form of this fish, 
as rudely indicated by the fossil, and the presence of lacunae 
in the bone dictate a reference to the Osteostraci, among 
which it is accordingly placed. 
Prof. Traquair has established a new order (Anaspida). 
of fossil fishes to include some forms which agree with neither 
of the orders already mentioned, and indeed which resemble 
