BIBLIOGRAPHY OF THE MEROSTOMATA. 27 
a paper, which he had read in October, 1858, to the Dorpat Naturalists’ Society® on 
Eurypterus remipes from the Upper Silurian strata of the Island of Oe¢sel, Baltic. 
Dr. Nieszkowski gives restorations of the upper and under sides of Hurypterus ; and in 
the latter figure he shows the appendages of the mouth zw sifu, and three thoracic plates 
for the under side of the body. We think this possibly arises from a misconception of 
the median appendage, but shall refer to this paper again when treating of the genus 
Eurypterus. 
44. In a second paper communicated to this society, in October, 1858, Dr. Nimsz- 
KOwsk1”™ describes and figures Bunodes lunula of Hichwald, and a new species, which he 
names B. rugosus ; also two new genera allied to Hemiaspis, namely, Exapinurus Schrenkit, 
and Pseudoniscus aculeatus ; all these are from the Upper Silurian of Rootzikiill, Island 
of Oesel, Baltic. He has likewise figured a metastoma or lip-plate of Pterygotus, four 
inches in length and three inches broad, from the same locality. 
lic 4. Pterygotus anglicus, Agassiz, restored (1859). 
45. The third (second) edition™ of Sir R. I. Murcutson’s ‘ Siluria’ (1859) furnishes 
us (besides numerous separate notices of the Hwrypterida) with a restored figure, by Mr. 
J. W. Salter, of Plerygotus anglicus, about one twentieth natural size, giving all the 
details then known. 
46. Mr. Davin Paar™ gives us (1859) restorations of Pterygotus unglicus, Himan- 
lopterus acuminatus, Stylonurus Powriei, Stylonurus spinipes, Eurypterus clavipes, Euryp- 
