60 | 
transverse furrows. This last character is probably 
not a permanent one. ae. ff 
But the most distinguishing claaneeat is the pro- — 
longation of the costal arches, particularly those of — 
the tail, beyond thesmembrane which they are sup- ea 
posed to supports the termination of these arches is : 
in teeth or spines. Some species of the Asaph have — 
prolongated extremities to the ribs of the abdomen, — 
but we have never seen them on the arches of the tail. 
This genus is said to comprise a great number of 
species, but the only one found in North America, as | 
far as our knowledge extends, i is that described by 
_J. J. Bigsby, in the fourth volume of the Journal of 
the Academy of Natural Sciences of Philadelphia. 
As we have not seen the specimen,-we add the de-. 
scription of it in the author’s own words. 
“& Parapoxipes Botton. Bigsby. Figure 5. 
Oval, blinds; surface with small tubercles and 
strie; clypeus rounded befores exterior angle ex- 
tending in a broad spines abdomen fourteen jointed; 
segments recurved, falcates tail membranaceous and 
serrate. : i 
The shape of this individual is oval, approaching 
ovate; it is moderately flats; the whole length is five 
inches and four-fifths; its breadth across the middle 
is four inches and nine-tenths; wherever the cutis is 
not removed, it is covered profusely — pbs ba 
wh small tubercles. - ul 
y 
al 
ye 
