262 NEW YORK STATE MUSEUM 
Dolichopterus macrochirus Hall 
Plate 35, figure 1; plates 4o-45 
Dolichopterus macrocheirus Hall. Palaeontology of New York. 1859. 
3:414, pl. 83, fig. 1; pl. 83a, fig. 1 
Professor Hall based his description of this genus Dolichopterus 
and of its genotype D. macrochirus upon a single specimen from 
the waterlime at Williamsville. This is now in the American Museum of 
Natural History and is unique in its state of preservation, for it can be 
lifted bodily out of the matrix and exhibits both sides; these were so 
accurately figured by Whitheld that new figures can add only im- 
material features. Unfortunately, however, this type lacks the greater 
part of the postabdomen and telson and retains only the proximal 
portions of the limbs, save the last pair, besides being incomplete in 
such other important points as the posterior portion of the metastoma, 
the opercular appendages and the operculum itself. It is therefore ex- 
tremely gratifying that later collections in this State have afforded three 
more specimens of this extremely rare species which happily supply the 
desired information. The most important of these is a specimen from 
the famous locality of Wheelock’s hill, Litchfield [pl. 43]. This retains the 
postabdomen and telson and furnishes important information as to the limbs 
genital appendages to Dolichopterus, pointing out its similarity to the cor- 
responding part of D. macrochirus. The opercular appendages of Stylonurus’ 
however are not yet known and hence this similarity is not conclusive of identity 
with Dolichopterus. ; 
Schmidt figured [op. cit pl. 7, fig. 9] a very interesting leg, referred by him with 
doubt to Pterygotus osiliensis, and which possesses broad, leaflike spines 
like those on the last legs of species of Dolichopterus. Holm [p. 56] indicated the simi- 
larity of this leg to that of Dolichopterus but suggested that the broad spines are only 
wrinkles since the limb is very poorly preserved. From our observations of like 
appendages on the legs of at least two species of Dolichopterus, we consider it probable 
that Schmidt’s figure is correct and that this leg indeed demonstrates the presence 
of the genus Dolichopterus in the fauna of Rootzikull. 
