482 C. H. HITCHCOCK — AMMONOOSUC DISTRICT, NEW HAMPSHIRE 



The following is a description of this species : 

 Dalmanites lunatus (Lambert). 



Cephalon strongly lunate ; length one-third of width. 



Glabella consists of a large, transversely oval frontal lobe, the longi- 

 tudinal dimension being one-half of the transverse. This lobe is sepa- 

 rated from the first of the three following lobes by a furrow which runs 

 backward obliquely toward the median line. This furrow is broadest 

 in its outer part. The length of the remaining lobes equals that of the 

 frontal lobe. They are separated by narrow transverse furrows. 



Facial furrow bounding the glabella laterally, deep and conspicuous, 

 communicating more or less freely with the longitudinal furrows of the 

 glabella. 



Neck furrow deep and conspicuous, passing outward from the posterior 

 termination of the facial furrow, and ending near the base of the genal 

 spine. 



Facial suture passes from before the frontal lobe of the glabella back 

 to the posterior margin of the eye, then outward, meeting the lateral 

 margin of the head at a point somewhat above the level of the middle of 

 the eye. 



E}^es compound, large and conspicuous, considerably elevated. 



Pygidium triangular, broad, convex anteriorly, the middle lobe con- 

 sisting of from thirteen to fifteen annulations, wide anteriorly, decreas- 

 ing to one-half its width posteriorly ; lateral lobes eight strongly renexed 

 segments which pass laterally into a broad marginal limb. The segments 

 are marked by conspicuous furrows which are near and parallel with 

 the lower margin. The marginal limb is produced posteriorly into a 

 short, acutely triangular, pygidial spine. 



Explanation of Plate 44 



Figure 1. — Dalmanites lunatus. Littleton, N. H. 



Cephalic shield. The specimen is considerably distorted by the 

 lateral compression of the rock. Specimen in the museum of Dart- 

 mouth College. 

 Figure 2. — Dalmanites lunatus. 



Cephalic shield. Showing the strong, crescentic curve of the frontal 

 portion of a normal cephalon. Specimen in the possession of the 

 writer. 

 Figure 3. — Dalmanites lunatus. 



Pygidium. Specimen number D. 60. C. C. National Museum. 

 Figure 4. — Dalmanites caudatus. Dudley, England. 



The Littleton species approaches somewhat near to this species in 

 the anterior breadth of the pygidium and the acutely triangular char- 

 acter of the pygidial spine. Specimen number 18,475. National 

 Museum. 

 Figure 5. — Dalmanites lunatus. 



Hypostoma. Specimen number D. 60. Q. Q. National Museum. 



