Are GEOFFREY SMITH. 
Occurrence.—In clay-ironstone concretions in lower Coal- 
measures of Mazon Creek, Morris, Illinois. 
Woodward describes another species, P. Burnettii, 
measuring 30mm. from the middle coal-measures of Irwell, 
Lancashire. In this species he describes the transverse 
striee on the segments which he afterwards observed in Pre- 
anaspides. 
Genus 3. Gasocaris (Fritsch 17). 
The flagella of the first antennz are unequal in size. All 
the thoracic limbs are similar, rather short and stoutly built 
(without exopodites according to Fritsch). The telson is 
rather shorter than the uropods, ‘here is a row of sete on 
the posterior dorsal margin of all the thoracic and abdominal 
segments. The body is broad anteriorly, tapering consider- 
ably toward the hinder end. ‘The abdominal limbs are stout, 
but annularly segmented. 
G. krejcii (Fritsch 17). (Text-figs. 59, 60, and 61.) 
Fritsch establishes beyond doubt the pedunculated nature 
of the eyes and the structure of the first and second antenne. 
In his restoration, however, he makes the two flagella of the 
first antenne equal in size, which is contradicted by his 
figure of an actual specimen in ventral view (text-fig. 59). The 
scale of the second antenna seems to have reached the top of the 
peduncle on which the flagellum is inserted. With regard to 
the segmentation of the body his reconstruction is impossible 
to reconcile with the ventral view of an actual specimen. In 
the reconstruction he makes, besides a narrow head-segment, 
only six thoracic segments. In the ventral view, repro- 
duced here, it is easy to make out eight free thoracic segments 
with limbs, and a broad segment in front to represent the 
head, and this structure would bring the specimen into line 
with the other Anaspidacea. ‘he thoracic limbs, as recon- 
structed by Fritsch, are all similar, being rather short and 
