478 J. M. Clarke—New Phyllopod Crustaceans. 
anchylosis of ah lateral valves and its wide, wedge- age ie 
cleft, but differs in the presence of the “rostrum” or plate 
acting as da: anid vad to cover the cleft, and also in its more 
nearly circular outli 
The srnaisetanien nat the surface of the carapace in this 
species, S. Hmersonti, n. sp., consists of low concentric ridges 
a 
more eer dees on the sides than at the eign 
of the valves. ee of the cleft these lines show 
inane re a retral beads 
Radiating lines from he apex of the cleft to the margin 
cover the anterior portion of the carapace and give to this part 
a strong decussate sculpturing which is rarely noticeable along 
the margins of the cleft. I am not satisfied that I have seen 
the abdominal arthromeres of this neg though it will be 
only a matter of time for their detectio 
The geological horizon in which gu occurs, the Portage, is 
usually regarded as barren of fossils in New York, but is show- 
ing under ‘careful scrutin ny many facts of paleonto ological i inter- 
est au = fairly especially in the direction of the ates 
crustac 
Hacc N aples, Ontario Co., N. x 
Fig. 1, Spathiocaris Emersonii, shows the carapace free from sag seesgia ih 
ith an un oo central apex. ot . The same, young.—Fig. 3. e, 
wing by la compression the usual position of. the apex = aches, of ea 
Staal fore se well as the position na the possible dorsal sutu 
Lisgocaris, n. g. (Aioyos=a shovel.) 
Carapace in one piece, without evidence of dorsal suture. 
Periphery sub- pentagonal, lateral edges parallel, making shar 
angles with the two anterior e ges nterior edges re- entrantly 
enrved and meeting in the axis of the carapace. As in the 
genus Spathicaris, there is an sti oe cleft beg ining cen- 
trally and at the highest point of the carapace, which is con- 
cored elevated, and widening to the posterior margin. 
This species, Z. Luther’, has the surface of the gat con- 
centicl y marked with fine, crowded, impressed lin No 
o idence of abdominal arthromeres. This is a very ‘daliede 
orm feat uring three by two millimeters, which has been 
rie near the base of the Hamilton proper in the same horizon | 
as Estheria pulex. It belongs to the apus type of the et Fs oe 
with Peltocaris Salter, Disecinocaris Woodward, and Spath tocaris. 
Northampton, Mass. 
