Review of Ttecent Geological Literature. '■'<'.)■'> 
fossils,'a finished report (Part I) was published by the Pala-ontographical 
Society in 1888, embracing the Ceratiocarida> of Great Britain. This 
second part, without entering upon any elaborate classification, dis- 
cusses first, Phyllopodous forms toith hinged or folded valve-like car- 
apaces (including Hymenocaris, Lingulocaris, Saccocaris and Caryoca- 
ris, all Salter's genera and the last three still very imperfectly and un- 
satisfactorily known), and, second, shield-like phyllopodous carapaces 
sutured along the back: the fossils which have been described as Apty- 
cliopsis, Peltocaris, etc. Under this caption the opportunity is taken of 
making some reference to the fossils known as Discinocaris, Cardio- 
caris, Spathiocaris and Ellipsocaris, which were believed by their de- 
scribers to represent rostrate phyllopod (or pbyllocano) carapaces, hav- 
ing not remote relation to Peltocaris: and herein a very instructive 
illustration is afforded of a structural similarity in organs having not 
only totally distinct functions, but belonging to widely different organ- 
isms. Peltocaris, which was the first of this group of genera to be 
described, is a nearly circular body divided by a median suture, and 
with a broad triangular notch at one end. The fact that this notch is 
sometimes filled by a triangular plate led to the inference, unquestion- 
ally accurate, that the fossil represented the carapace of some rostrate 
crustacean. Discinocaris and Aptychopsis, which, with Peltocaris, are 
from Ordovician and Silurian faunas, were the next to be described; 
and these also showed the same rostrate structure, with some slight 
modification in outline and contour, Discinocaris not having the median 
dorsal suture. Then followed the descriptions of Cardiocaris and 
Ellipsocaris by Woodward, and Spathiocaris by Clarke, all from the 
Devonian, and all having, like Discinocaris, no median suture, but pos- 
sessing the anterior triangular cleft of the proper size for a rostrum, 
though such a plate has never been found in one. These non-sutured 
bodies, whether Silurian or Devonian, are alike in every palpable fea- 
ture, barring the persistent absence of the rostrum in the latter. They 
are tenuous carbonaceous plates, without any very positive evidence of 
division into lamella*, their surface always covered by regular concen- 
tric ridges; and, adding the median suture, the same is true of Pelto- 
caris and Aptychopsis. Some of these Devonian bodies were referred 
to, long ago, by De Verneuil, Keyserling and F. Roemer as Aptychi of 
goniatites, and this function was fairly demonstrated for at least one 
form, Spoteocaris koeneni, by Kayser's discovery of a specimen in the 
body chamber of Gon. intumescens, which it precisely fitted. Wood- 
ward afterward illustrated other goniatites which contained forms 
referred to Cardiocaris, so that one can no longer hesitate to hold with 
these authors that "some of the so-called little shield-like fossils which 
came from goniatitiferous Devonian strata will have to be referred to 
Goniatites." And yet Discinocaris, which is almost indistinguishable 
from some forms of "( 'ardiocaris" occurs in strata which antedate the 
appearance of goniatites. There are still some points in regard to these 
bodies so necessary of explanation as to lead to the belief that we have 
not yet got at the whole truth concerning them. For example, the 
