98 G. F. MATTHEW ON THE ORGANIC REMAINS OF THE 



Pal^eophonus. Thorrell & Lindstrora. 



Palœophonus ardus, n. sp. PI. I., figs. 7 a & h. 



Onh^ tlie céphalothorax and one jomt of the abdomen are known. The former is sub- 

 rectangular, obtusely pointed and lobate at the front, and somewhat narrowed behind. The 

 posterior end is somewhat emarginate, and a narrow rim runs around the edge of the shield. 

 The centre in front has a deep sinus, at the end of which there is a triangular depression, 

 terminating on the inside of the shield in a sharp elevated ridge, extending backward along 

 the axial line to a point two-fifths from the front of the shield. At the middle of this ridge 

 on the inside of the shield is a pair of low ridges that curve backward and outward toward 

 the margin of the shield, and another pair curve outward and forward from the anterior end 

 of the axial ridge. 



A flattened lunate area is found at the outside of each front lobe of the shield, 1)eginning 

 at the front and extending one-third of the length of the shield ; at the front half of each of 

 these areas is a shallow pit which may indicate the position of lateral eyes, and on the trian- 

 gular area, at the back of the sinus in the front of the shield, are two pairs of minute 

 tubercles, marking the positions of four central eyes. 



The posterior half of the shield exhibits three pairs of oval bosses or swellings of the 

 crust, of which the middle pair are smaller and closer to the axis of the shield than the 

 others. At the axial line, on the indented posterior margin of the shield is a small obtuse 

 point. 



The joint of the abdomen preserved does not reach out at the sides as far as the width 

 of the céphalothorax, and is about five times wider than long. 



Sculpture. — Only the inner surface of the shield is known ; this is covered with minute 

 punctures. 



Size. — Length of the céphalothorax 9 mm. Width 6 mm. 



Horizon and Locality. — Plant bed Xo. 2, Little River Group at Fern Ledges, Lancaster, 

 St. John Co., N.B. 



This curious little shield shows many points of resemblance to the céphalothorax of 

 P. nuncius (pi. I., fig. 8) as figured by Thorrell and Lindstrom : ' it is however narrower, 

 especially behind, and the slit in front is wider. The shield is evidently flattened by pressure 

 in the shale, and so in life the points of the fi-ont lobes may have been closer together. 



PULMON'IFERA. 



Li the November number of the American Journal of Science for 1880, Sir "Wni. Dawson 

 discussed the land snails of the Palaeozoic era, stating that at that time only six species (includ- 

 ing two described in that paper) had been described, and of these five belonged to the Car- 

 boniferous system ; the remaining species was that form referred to on a previous page as 

 Strophites grandceva. The species described below adds another form to the pulmonifera of 

 the Little River Group and is not very dissimilar from that first found. 



Pupa prim^va, n. sp. PI. I., figs. 10 a & h. 

 Shell cylindrical, abruptly conical at the apex, increasing rapidly in the u[)per whorls. 

 Whorls six ; sides of the whorls rather flat, upper edge sub-carinate ; the last whorl about 



' Treatise on Palœontolgy, Zittel &Barrois, vol- ii., p. 738. 



