82 MR. F. R. C. REED ON THE GENUS LICHAS. _—_[ Feb. 1902, 
Grovp I.— Profolichas, nom. prop. | Group Il.—Deuterolichas, nom. prop. 
Section A. Corydocephalus. | Section A. Hoplolichas. . 
»  B. Dicranopeltis. »  B. Homolichas. 
a eC. -Platylichas: | » ©. Conolichas. 
.  D. Metopolichas. »  D. Echinolichas. 
» EE. Metalichas, nom. prop. | » Kh. Letolichas. 
. F. Uralichas. »  F. Paralichas, nom. prop. 
,, G. Ceratarges. »  G. TLerataspis. 
»  H. Oncholichas. »  H. Ceratolichas. 
The British members of the family of the Lichadide are distributed 
among the sections as follows :— 
Grovur I. (Protolichas.) 
Sect. A. (Corydocephatus.) _ Sect. D. (Metopolichas.) 
L. anglicus, Beyy. | L. laciniatus, Dalm. 
L. hirsutus, Fletch. | LL. patriarchus, Wyatt Edgell. 
L. scutalis, Salt. Li. affinis, Ang. 
L. devonianus, Whidb. LL. conformis, Ang., var. keis- 
? L. nodulosus, Salt. leyensis, Reed. 
B. (Dicranopeltis.) LL bulbiceps, Phill. 
L. Barrandei, Fletch. LL. verrucosus, Hichw. 
L. Woodwardi, Reed MS. (? British), 
? L. Salter7, Fletch. EK. (Metalichas.) 
C. (Platylichas.) L. hibernicus, Portl. (pars). 
L. margaritifer, Nieszk. 
(? British). 
L. hifurcatus, Reed. 
?L. Grayi, Fletch. 
?L. laxatus, McCoy. 
Group IT. (Deuterolichas.) 
Sect. B. (Homolichas.) | Sect. F. (Paratichas.) 
L. angustus, Beyr. (? British). | LL kildarensis nom. prop. 
| (=L. hibernicus Portl. pars.) 
L. levis, Hichw. (? British). 
The small number of British species belonging to Group IT is 
noticeable. 
With regard to their distribution in the British Isles, Sections 
A & B of Group I appear to be entirely Silurian or Devonian, 
while the great majority of the members of the other sections are 
Ordovician. 
