CAMBARUS. 4] 
College, Kentucky, published in the ‘ Belfast Commercial Chronicle’ of Jan. 1, 
1844, where it occupies two columns, but the source whence it was obtained 
is not acknowledged. . . . . The crayfish and ‘crickets’ are stated in the 
letter already noticed [the Rev. Wm. Murphy’s?] to be blind, but this is 
erroneous. Both species have eyes. Our specimen of the crayfish wants 
both the claws, but is otherwise perfect, and agrees with the description of 
the Astacus Bartow Fabr., given in Milne Edwards’s ‘ Histoire des Crustacés,’ 
Vol. II. p. 531. The length there attributed to the species is 3 inches; the 
specimen before us is 2} inches in length from the point of the rostrum to 
the extremity of the caudal plates.” 
The description of Asfacus Bartowi by Milne Edwards, here referred to, 
is in reality a description of Asfacus affius Say; but as C. Bartonii is the 
only eyed crayfish known to inhabit the Mammoth Cave, it was probably 
the species in Thompson’s hands. Tellkampf’s type (a male, form I.) was 
more fully described by Erichson, and was seen by Hagen in the Berlin 
Museum in September, 1870. 
The presence in the Mammoth Cave of a crayfish with well-developed 
eyes, together with the blind species, was noticed by Prof. B. Silliman, Jr., 
in 1850. In a letter to Professor Guyot, dated Louisville, Nov. 8, 1850, 
printed in the American Journal of Science and Arts, 2d Ser., Vol. XL, 
May, 1851, he says (p. 336): — 
“The crawfish, or small crustacea inhabiting the rivers with the fish, 
are also eyeless and uncolored, but the larger-eyed and colored crawfish, 
which are abundant without the cave, are also common at some seasons in 
the subterranean rivers. . . . . Among the collections are some of the larger- 
eyed crawfish which were caught by us in the cave.” 
I have now before me specimens of C. pedlucidus and C. Bartonii from the 
Peabody Museum of Yale College (Nos. 1814, 1815), collected by Professor 
Silliman in the Mammoth Cave. More recently, C. Bartowii has been fre- 
quently captured there. 
The association of C. pellucidus and ©. Bartonii in the Mammoth Cave, 
and the fact that cave specimens of the latter are often very light colored, 
led Professor N. S. Shaler* to conclude that the two species were connected 
by transitional forms, and that the blind form was derived from the present 
outside fauna of the region. He even goes so far as to suppose that the 
blind form, C. pellucidus, is continually reinforced by interbreeding with the 
* Mem. Boston Soe. Nat. Hist-, II. 862, 363, 1875. 
6 
