78 B. N. PEACH ON SOME NEW CRUSTACEANS FROM THE 
other is pointed. They differ also in the nature of the broadened tail-flaps of 
the sixth segment. 
The ornamentation on the carapace and the broad basal scales of the 
antenne distinguish it from A. Gracilis, Meek and Worthen.* The tail too is 
different, being not quite so complicated as in that species. 
From A. Hilliana, Dawson,t the number of ridges on the carapace show it to 
be distinct. J 
Anthrapalemon Parki, nov. spec. (Pl. TX. figs. 4 to 47). Length from three to 
four inches, and breadth about one-third of the length, which is continued down 
to the sixth abdominal segment, where it expands into a remarkably wide tail. 
Carapace two-fifths of whole length. When expanded it forms an irregular 
quadrilateral figure with rounded off corners, and which is a little narrower in 
front. ‘The anterior margin is concave, and gives off a broad leaf-shaped 
rostrum. The posterior margin is also concave. The margins are strengthened 
by a broad thickening band, broadest at the posterior angles. A deep cervical 
groove, or folding in of the test, proceeds from the anterior angles forming an 
angle of 150° on the median line of the back and divides the carapace into two 
unequally sized areas. The posterior and larger is ornamented by seven ridges 
besides the marginal ones. The middle ridge alone is continued back from the 
cervical groove to the posterior margin, the next two on each side proceed from 
the cervical groove, but are lost before reaching it. The two remaining ridges 
are continued back from the cervical groove, and merge into the lateral 
thickened band at the posterior angles. The area in front is divided into 
several raised portions separated by depressions, but none of the ridges are 
continued on to it. One fold of the test overlaps the base of the rostrum, 
which is leaf-shaped, being narrow where it joins the carapace, expanding 
rapidly and then tapering off to a blunt point. The anterior portion is grooved 
medially and droops downwards. Neither the rostrum nor the ridges on the 
carapace bear any trace of spines or bosses. The test throughout is smooth or 
slightly wrinkled. 
The Cephalic Appendages.—The eyes probably large, and set at the angles 
made by the rostrum with the carapace which are rounded into sockets. The 
antennules consist of two pairs of broadened and jointed peduncles, at least 
three joints are seen which are serrated at their bases, each of which supports 
two jointed sete. The antenne are two broad jointed peduncles which give 
off long jointed sete. No broadened basal scale observed. The rest of the 
cephalic and thoracic appendages not observed. The abdomen consists of six 
segments without the telson. These are short in front, becoming gradually 
* Tllinois Geol. Survey Report, 1866, vol. i. p. 407, pl. xxxii fig, 4, a, 0, ¢. 
+ Geol. Mag., 1877, vol. iv., new ser., fig. 1, p. 56. 
