114 PALjEONTOLOGY OF NEW-YORK. 



The closely arranged branchlets, near the summit of the column, cover aud 

 obscure the structure of the base of the specimens figured. The arms are not pre- 

 served entire ; but from tlie gradually tapering form and small joints, we may 

 infer that they continue simple above the first bilurcation. In the si>ecimen ( fig. 3) 

 which preserves a part of the proboscis, the anal plates are conspicuous, while their 

 connexion with the proboscis is destroyed, and only the upper portions are preserved. 

 The whole specimen has been much crushed, and the arms and tentacula arc in- 

 volved with the crushed proboscis. 



Fig. 1. A specimen preserving a part of tlie column, with the branchlets broken off. Tlie 



body is too imperfect to be represented in detail, but the arms and tentacula 



correspond to those of fig. 2. 

 Fig. 2. An individual nearly entire, with a small portion of the column and branchlets 



attached, aud nearly covering the body. The arms are preserved nearly to their 



extremities. 



Fig. 3. An individual much crushed, showing the structure of the body and a portion of the 

 proboscis. The small point for the attaclimcnt of the column is well shown in the 

 figure. 



Fig. 4. Enlargement from fig. 2 of the first and second radial plates, the first arm joint, and 

 succeeding plates of the arms aud tentacula. 



Fig. 5. Structure of the body and base of arm, from fig. 3. 



Geological position and locality. In the shaly partings of the Pcntamcrus lime- 

 stone of the Lower Heldcrberg group : Jerusalem hill, Litchfield, Herkimer county. 



IMatycriiius pamis(n. s.). 



Plate IV- Fig. 6-9. 



Body very small. Basal and first radial plates obscure. Second radial plates 

 filling the excavation in the upper margin of the first radial. 



Arms bifurcating upon the first brachial plate, and continuing simple to 

 their extremities : joints of the arms about as wide as long, giving 

 origin to one or two tentacula on each side. Tentacula composed of 

 rounded joints, which are about as long as wide. 



Column round, slender; consisting, near the body, of alternating large 

 and small joints, and below, of a greater number of small joints al- 

 ternating with the larger ones. The large joints give origin to long 

 slender branchlets which arc closely clustered around the body, and 



