. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Ortmann: Families \\n Genera oi \.\r. 359 again at aboul the middle of the lower margin. The inner edge has crowded, verj fine papilla?, which decrease anteriorly, and the anterior part of the edge is smooth. The since between the two edges is of a peculiar spongy structure, full of what appear as finely rounded i ir elongated pores. In the male the two edges of the mantle are subparallel and close together, as usual, and the inner one has very minute papillae. The color of the soft parts is
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Ortmann: Families \\n Genera oi \.\r. 359 again at aboul the middle of the lower margin. The inner edge has crowded, verj fine papilla?, which decrease anteriorly, and the anterior part of the edge is smooth. The since between the two edges is of a peculiar spongy structure, full of what appear as finely rounded i ir elongated pores. In the male the two edges of the mantle are subparallel and close together, as usual, and the inner one has very minute papillae. The color of the soft parts is generally whitish or yellowish white. Outer edge of mantle grayish posteriorly, in the region of the anal and supra-anal blackish, not spotted. Papilla? of branchial brown, but this color does not run forward along the inner edge, and the inner edge itself and the spongy space between the two edges is snow-white. Truncilla florentina (Lea). One gravid female has been received from B. Walker. It is from Shoals Creek, Lauderdale Co., Alabama, collected Nov. 2, 1909, by H. H. Smith. Soft parts practically identical with those of T. rangiana, but the color of the margin of the mantle is different. Here both edges of the mantle are black-brown all around, and the space between the two edges is deep black. There is also in this region a deep black streak on the inside of the inner edge. The outer edge is slightly scalloped, cor- responding to the dentate margin of the shell. In the specimen at hand, the spongy space is covered with numerous low granules, which I do not see in T. rangiana. Glochidia like those of the other species; length ; height ; mm. (see Plate XX, fig. 12). In this species also the post-basal expansion is somewhat different in texture from the rest of the shell, contrary to Walker's statement. It resembles very closely the structure seen in T. capsceformis. Truncilla capsaeformis (Lea). One male and one sterile female, received from B. Walker, from tin-
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
