Packard.] 
212 
[April 3, 
and a little too short. It is really in proportion nearly as long and 
quite as slender as that of Prestwicliia longispina Pack. (PI. v, fig. 4). 
The following measurements of this specimen will give the pro- 
portions of the genal spine to the rest of the body. 
Length of body, exclusive of caudal spine, 32 mm. 
“ “ head, 16 mm. ; breadth at base of genal spine, 35 mm. 
“ “ abdomen, 16 mm. “ u “ “ lateral spine, 22-23mm. 
“ “ genal spine, 20 mm. 
Distance from middle of frontal edge of head to end of genal spine, 
36 mm. 
Bachura venosa Scudder. Two specimens of this Phyllocaridan 
were received from Mr. Gurley ; one shows the carapace, and the 
other the end of the abdomen, with the caudal spine ; they are pre- 
served in the dark hard gritty limestone of the middle coal meas- 
ures of Danville, 111. The specimens appear to be referrible to the 
form described by Mr. S. H. Scudder under the above name in the 
“Proceedings of the Boston Society of Natural History, xix, 296, 
PI. 9, figs. 3, 3a. 
In the specimens before me the ill-preserved portions of the car- 
apace indicate that it was a little over three inches long, and of a 
general oval-triangular shape though the outlines of both anterior 
and posterior ends are, unfortunately, not clearly to be traced. It 
seems to have been perhaps laterally compressed, and a broad thick- 
ened margin on what seems to be the upper side is apparently the 
median or hinge-margin connecting the two valves or sides of the 
carapace. 
The last two abdominal segments are as described by Mr. Scud- 
der, but three caudal spines are preserved, where apparently only 
one is represented in Mr. Scudder’s figure. What he represents as 
a second curved caudal appendage, the left one in his fig. 3, and 
drawn as bearing a single broad rather obtuse spine, is in the speci- 
men before me detached from the rest of the body, and its nature 
is problematical to me. The appendage is considerably curved and 
i bears two large sharp thorn-like spines of unequal size, and about 
a fifth of an inch apart. The length, as curved, is equal to that of 
either of the normal caudal spines. There are traces of another 
similar appendage, showing that there were a pair of them. I do not 
know of any such armature in others of the group. Two bayonet- 
like caudal spines are clearly indicated, and are in place, being at- 
tached to the terminal segment. They are 15 mm. in length. 
