Page:The Eurypterida of New York Volume 1.pdf/330

 doubtful whether the spine that now holds a horizontal position, is the terminal spine, pushed far back, or only a lateral spine in an accidental position.

The fragment of a segment indicates by the strong rounding of the antelateral angles and the great length, that it might belong to an operculum, in which case the absence of a median transverse line would be remarkable; or to one of the first sternites. The crowding and the transversely elongate form of the scales in the anterior lateral region indicate that this part has been pushed together in posterior direction and the anterior margin is not complete. It probably extended as far forward as the median portion of the segment.

Mr Walcott has sent with the two types a third fragment which has not been figured hitherto, but which beautifully shows the character of the scales [pl. 58, fig. 2].

All the fragments and the size of the sculpturing indicate that  was a form of large dimensions and robust structure.

Another eurypterid of the Lower Siluric is from the Richmond group of Ohio and was described by S. A. Miller [1874] as a graptolite under the name of. When the junior author was engaged on the monograph of the Graptolites of New York, inquiry was made in regard to this curious fossil and the information obtained through Drs Ulrich and Foerste that the species is based, as the figures at once suggest, on fragments of an eurypterid. Dr Foerste has been engaged for some time in an investigation of the Richmond faunas of the Ohio valley, and as he presumably had secured all the material available of this form, we have asked him to publish in this place that part of his manuscript referring to Megalograptus. To this request he has kindly acceded by sending the appended description. The photographs of Miller's types are here reproduced on plate 58.