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P^LJEONTOLOGY OF NEW-YORK. 
604. 2. MYELODACTYLUS BRACHIATUS (n. sp.). 
Pl. XLV. Pig. 7 a - e. 
Fragment of an arm, somewhat semicylindrical or unequally pentagonal; lateral appendages 
cylindrical, strongly articulated ; canal transversely oval, with marks of muscular impressions 
towards the circular margin very strongly impressed. 
Fig. 7 a. A small fragment enlarged, showing two lateral appendages. 
Fig. 7 b. Transverse section of the same. 
Fig. 7 c. Section of one of the cylindrical appendages. 
Fig. 7 d. A larger convolute fragment, with several appendages near the lower part. 
Fig. 7 e. The convex or outer side of this specimen, which has a depression along the centre, 
from the upper part, nearly to the base, where it gradually becomes obsolete. The 
depression is marked by two finer grooves along the centre. There are three appen¬ 
dages on each side near the lower extremity, composed of elongated cylindrical joints 
gradually tapering upwards. 
605. 3. MYELODACTYLUS -? 
Pl. XLV. Fig. 8 a,b; and 9 a, b, e. 
The fragments figured are similar to the preceding in many respects, but the section is 
trapezoidal, the canal more extended transversely, and there are no appearances of lateral 
appendages or tentacula. 
Fig. 8 a, b. A fragment, which is compressed either naturally or by accident. The section 8 b 
shows the form of section. 
Fig. 9 a, b, c. Another fragment, and the section, showing the difference of form in the two. 
The canal and character of muscular marking are precisely the same in each. 
Position and locality. All these fragments of columns and roots have been found in the 
decomposing shale at Lockport. Many other fragments, showing distinct features, have been 
found with these ; but the examinations I have been able to give them, have not been sufficient 
to settle definitely their analogies with known species. 
