1889.] 
209 
[Packard. 
General Meeting, April 3, 1889. 
The President, Prof. F. W. Putnam, in the chair. 
Dr. J. Walter Fewkes read a paper on u The French Marine 
Laboratory at Roscoff in Brittany.” (See American Naturalist, 
February, 1889.) 
The following papers were read by title : 
PALEONTOLOGICAL NOTES. 
BY ALPHEUS S. PACKARD. 
I. ON A FOSSIL MACRURAN CRUSTACEAN FROM PERU. 
PLATE III, FIG. 1. 
The specimen here described was received from Professor J. S. 
Newberry, with the statement that it came from Peru. 
The fossil occurs in a fine, homogeneous, hard, gritty limestone ; 
but it scratches glass owing to the fine particles of silica scattered 
through it, while it is soluble with dilute acid ; it has a decided 
conchoidal fracture, and is black when freshly broken, but weathers 
to a whitish gray. 
The fossil itself, unfortunately, is not sufficiently well preserved 
to allow us to decide to which family of Macrurans it belongs, 
though enough so to enable one to recognize the species and genus, 
should other examples be discovered. 
The antennae and mouth appendages have not been preserved ; 
and the carapace is much out of place, while the rostrum is ob- 
scurely indicated, if present at all. Yet the five pairs of thoracic 
appendages are tolerably perfect, though the terminal joints are not 
present ; still the form of the legs and carapace is such as to pre- 
vent our referring the fossil to any of the families of known Ma- 
crurans, whether living or extinct. The abdomen is wanting. 
Description . — Of the five pairs of legs, those of the first and sec- 
ond pairs are considerably larger than those behind, the three pos- 
terior pairs being of moderate dimensions, and nearly equal in 
size, the fifth pair being as large as those of the third and fourth 
pairs. Of the first pair of legs, the five basal joints are present ; 
the basal or first joint is short, being only as long as the second 
joint is thick ; the second to fifth joints are triquetral or triangu- 
PROCEEDINGS B. S. N. H. VOL. XXIV 14 JULY, 1889. 
