. Annual report. 1st-12th, 1867-1878. Geology. 314 GEOLOGICAL SUEVEY OF THE TEEEITOEIES. beaks being rather prominent. Yalves uniformly convex. Greatest depth, one-eighth of an inch; greatest length, one-quarter of an inch. Specimens may occasionally attain to a larger size. Color, deep or light brown, mottled with black. Animal: antennae composed each of twelve or thirteen subequal joints. Twenty-four pairs of feet, the six posterior ones diminishing gradually away so as to render the last three rudi- mentary. The last of all is inserted upon the last caudal segment but one. There is a broad
. Annual report. 1st-12th, 1867-1878. Geology. 314 GEOLOGICAL SUEVEY OF THE TEEEITOEIES. beaks being rather prominent. Yalves uniformly convex. Greatest depth, one-eighth of an inch; greatest length, one-quarter of an inch. Specimens may occasionally attain to a larger size. Color, deep or light brown, mottled with black. Animal: antennae composed each of twelve or thirteen subequal joints. Twenty-four pairs of feet, the six posterior ones diminishing gradually away so as to render the last three rudi- mentary. The last of all is inserted upon the last caudal segment but one. There is a broad subtriangular plate, terminated by two pairs of very large spines, curved upwards; the inferior pair beiug longer and slenderer than the upper one. The concave margin of that plate is fur- nished with a series of quite small spines. On the uppermost part of the post-abdominal plate is inserted a pair of very delicate sword-shaped appendages, very difficult to be observed even with a good microscope. Along the posterior half of the back there exists a series of sixteen pro- cesses, provided upon their upper and posterior sides with about five or six minute-curved spines, the tip of which is bent backwards. The an- terior two of these processes are but rudimentary; the most developed occupy the middle of the series; the posterior ones again diminish gradu- ally as they approximate the post-abdominal plate. "Specimens collected at Cincinnati were sent to the Smithsonian In- stitution by Thomas Kite, of that ; Afterward Professor Haldemau makes the following statement, in Proc. Acad. Nat. 8c, Phil., vii, 34, 1854: "I find that the Limnadella described by Mr. Girard, Proceed. Acad., vol. vii, page 3, is my Limnadia coriacea, ib., 1, 184, for June, 1842. At that time I doubted the propriety of placing it in Limnadia, chiefly on account of the dorsal tubercles mentioned in my description, but I had no means of making the necessary comparisons. It was discovered in
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