. The Eurypterida of New York. Eurypterida; Paleontology. The metastoma is very similar to that of E. remipes, but subject to some variation and frequently somewhat contracted in the posterior portion [pi. 11, fig. s], giving it a more slender appearance. The female genital appendage was very correctly figured by Hall [loc. cit, pi. 81B, fig. 4]. Several well preserved specimens before us show the great size attained by this organ in mature individuals. It reaches with the long paired, hornlike terminal appendages, to the posterior edge of the third stemite. The interior tubular appendages of
. The Eurypterida of New York. Eurypterida; Paleontology. The metastoma is very similar to that of E. remipes, but subject to some variation and frequently somewhat contracted in the posterior portion [pi. 11, fig. s], giving it a more slender appearance. The female genital appendage was very correctly figured by Hall [loc. cit, pi. 81B, fig. 4]. Several well preserved specimens before us show the great size attained by this organ in mature individuals. It reaches with the long paired, hornlike terminal appendages, to the posterior edge of the third stemite. The interior tubular appendages of this organ are finely seen in the original of plate 12, figure 2, where the integument has broken away. They have Figure 35 Euryp- the prccisc form and relative proportions of that of iiarian. Cast ^of ^iii- ^ • r c m i p c s . The appendage of the second ster- terior of proximal por- ^^^^ ^^^ ^^^ bccu sccu unobscurcd by the overlying: tion of female oper- -^ y o cuiar appendage appendage of the Operculum. It is, however, well shown in the interior view, reproduced in plate ii, figure 4 [Hall's type of pi. 81, fig. 6]. It is extremely slender and pointed and reaches nearly as far back as that of the operculum. The male appendage does not differ from that of the preceding species. Ornamentation. As far as our observation goes, the ornamentation is quite like, that of E. remipes. This is especially notable in regard to the series of scales on the dorsal side, already correctly figured by Hall Figure 36 Euryp- terUvS lacustris [pi. 81B, fig. i]. The smaller scales which are rarely iiarian. Young indi- ,1 -, , 1 i • 1 1 1 vidual. Reproduced seen, are crescent-shaped to subtriangular and nowhere on plate n, figure i. densely crowded. Those of the longitudinal series were Natural size larger and circular in the anterior portion, becoming elongate in the pos- terior part of each row. Ontogeny. But little is known of the ontogeny of this species as but very few young individuals ha
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Keywords: ., bookcentury1900, bookdecad, booksubjectpaleontology, bookyear1912
