. The Conchologists' exchange. Mollusks. 28 THE NAUTILUS. Meretrix (Eutivela) perplexa Stearns, n. s. Shell waxen-white, porcellaneous, covered with a greenish-yellow epidermis recalling that of lphigenia brasiliensis or Mactra ponder- osa Jan. The surface under the epidermis is smooth or marked with lines of growth only. The figure sufficiently illustrates the other characters of the shell. The specimen figured measures 45 mm. long by 33 in height and 23 in diameter. There is an impressed lanceolate lunule 15 mm. long and about 4*5 mm. in greatest width. As in Tivela there is a prolongation f
. The Conchologists' exchange. Mollusks. 28 THE NAUTILUS. Meretrix (Eutivela) perplexa Stearns, n. s. Shell waxen-white, porcellaneous, covered with a greenish-yellow epidermis recalling that of lphigenia brasiliensis or Mactra ponder- osa Jan. The surface under the epidermis is smooth or marked with lines of growth only. The figure sufficiently illustrates the other characters of the shell. The specimen figured measures 45 mm. long by 33 in height and 23 in diameter. There is an impressed lanceolate lunule 15 mm. long and about 4*5 mm. in greatest width. As in Tivela there is a prolongation forward, between the beaks, of the dark epidermal coating of the ligament; forming a blackish lanceolate area in front of the beaks about 5 mm. long, resembling the dark area Eutivela perplexa Stearns. m J^rca% This and the TUgOSe subligamentary ridge are reminiscences of the period when the ances- tors of Tivela had a more archaic type of hinge. There is no defined escutcheon. The soft parts in alcohol present several differences when com- pared with Tivela crassatelloides. The gills are double, as in that species, but proportionately much larger and broader ; the edges of the mantle are double with a groove between them ; in both species they are open from the sinus to the anterior adductor; there are no papillae or granulations in E. Iher- ingi; the foot is elongated, linguiform, and sharp-edged, without sulci or granulations; the palpi are large and distinctly paired on each side instead of being partially fused ; the siphons are extremely short but rather large, the incurrent with several ranks of rather elongate tentacular processes, the excurrent with a single row of obvious papillae ; the siphons have blackish maculations toward their ends and are joined for most of their length on the adjacent sides. From the dark color of the tissues in alcohol, they were prob- ably reddish or, at least, not white in life. On a single shell of many, are two small brown maculae, so that
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
