478 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Family Solenopleuridae Angelin. 
Dipharus, gen. nov. 
One of the smallest trilobites found in the pebbles appears to 
be a wholly new form, and a very remarkable one. Not only is 
it a new species, but it seems that a new genus must be formed to 
receive it. The genera of trilobites from the Lower Cambrian 
are few in number, perhaps a dozen exclusive of those belonging 
to the Eodiscidae and the Mesonacidae, and inasmuch as trilobites 
were probably at a maximum during or even before the Lower 
Cambrian, many more genera should eventually be discovered, 
and we may confidently look forward to the time when a far 
richer fauna will be recorded from eastern Massachusetts. 
This genus is characterized by a long elevated glabella of 
approximately equal width throughout, with one transverse 
furrow close to the anterior end. The cheeks are elevated; the 
eyes are borne on high conical elevations opposite the glabellar 
furrow and there is a depressed anterior border. The thorax and 
P3"gidium are unknown. 
Genotype, Dipharus insperatus, sp. nov. 
Dipharus insperatus, sp. nov. 
Tj^pe, no. 1693, Museum of Comparative Zoology, Cambridge, 
Massachusetts. 
Known from one cephalon only. Specimen minute, about 
two-thirds of a millimeter in both length and width. The gla- 
bella is less than one-third the width of the /#C^I3->x 
cephalon and is marked off from the cheeks /fe;iiT~'r ^1 
by deep V-shaped furrows. It is obtusely round- ('¥■'' I I :;^ 
ed in front, expands backward very slightly, 1/ ^ j | jl 
but contracts again toward the posterior end; ^^trir^tlife^' 
highly elevated, the elevation increasing toward 
the occipital ring which carries a prominence ^ J^ 
directed backward, and a scar which may rep- ^;?^^^__^^ 
resent the base of a tubercle. There is no occi- ^ , ^. , 
Fig. 1. — Dipharus in- 
pital furrow. One glabellar furrow is present, speratus, sp. nov., 
^ ° . sketch of the type. 
and crosses the glabella as a low wide depression x 20. 
at about one-fourth the length from the anterior fig. la.-- Profile of 
^ . same. X 20. 
end; the glabella is somewhat constricted at this 
place. The facial sutures in front of and behind the eyes are 
nearly straight, directed diagonally to lateral and posterior mar- 
