114 A REVISION OF THE ASTACID.E. 



mens, second-form males and females, from Bradford, Ind., collected by A. S. 

 Packard, Jr.. labelled (apparently in Dr. Packard's hand) "Cambarus spinosus 

 Bundv," in one case "Cambarus spinosus Bundy, fide Bundy." They are cer- 

 tainly not C. spinosus, which is a Southern species with a short areola. I 

 think they are young C. rusticus, some of them possibly C. Pvtnami. The 

 areola is rather broad for C. rusticus, and the male appendages are rather 

 short for C. Putnami. In some of these specimens the rostrum is broad and 

 nearly plane ^in this resembling C. obscurus), and even a little carinated near 

 the tip. The tips of the fingers are orange-color preceded by a dark ring. 



All the forms mentioned above agree in having an excavated rostrum 

 with thickened margins, a long and narrow areola, the first pair of abdomi- 

 nal appendages of the first-form male furnished with a projecting angle on 

 the anterior margin at base of rami (except in the C. placidus from Quincy, 

 111., in which this angle is obsolete), the rami long and straight or the outer 

 one somewhat recurved. The chela? have a double row of low, inconspicuous 

 tubercles on their inner margin. They vary somewhat in the width of the 

 rostrum and areola, in the development of the spines of the rostrum, cara- 

 pace, carpus, and meros, in the length and curve of the fingers, and in the 

 length of the rami of the first abdominal appendages. After a careful com- 

 parison of all the specimens before me, I am inclined to unite them all as 

 forms of C rusticus. 



In the collection of the Academy of Natural Sciences of Philadelphia 

 are five dry specimens of this species (Nos. 126% 126 c ). which, according to 

 the labels, came from the State of Pennsylvania, Two of these are labelled 

 by Dr. Hagen "C placidus." Three (126% 126 c , Philadelphia Co. and Pitts- 

 burg) are in the same box together, labelled "A. Bartonii" by Gibbes, "C. affir 

 nis" by Hagen; and on pages 62 and 78 of his Monograph Dr. Hagen says 

 that the types of J. Bartonii Gibbes in the Philadelphia Academy are ('. affinis 

 Say. When I examined the Philadelphia collection in December, 1882, they 

 seemed to me surely C. placidus Hagen. No. 126" in the same collection, 

 labelled "C. affirm Say ( 0. Bartonii Gibbes)," is the true C. Bartonii, from Dela- 

 ware. There is little chance that transposition of labels has taken place, as 

 the number is pasted upon the specimens, and Gibbes's label and the original 

 locality label bear the same number. 



