Carbdniferous Trilobites. 87 



Dr. Shumurd s^-ives the following description of his species : " Pygidium 

 semi-elliptical, rather wider than long, very convex ; border moderately nar. 

 row ; axial lobe not Cj[uite as wide as the lateral lobes and considerably ele- 

 vated al)ove them ; anterior extremity arched ; posterior extremity obtusely 

 rounded ; rings lo. convex on the dorsum, flattened on the sides ; trans- 

 verse furrows rather deepl}^ impressed on the dorsum, but shallow and nar- 

 row on the flattened sides ; lateral lobes strongly arched downw^ards ; ribs 

 about 12, distinct, except the two or three last, which are obscure ; the first 

 four from the thoracic margin marked with a shallow but distinct furrow, 

 which is situated very near the posterior edge ; furrow^s between the ribs 

 rather deeply impressed ; surface very finely granulated." 



Dimensiom, — 6 lines ; greatest width, 6|- lines. 



Geological positioR and locality. — Archimedes limestone (Chester series), 

 Meramec River, at Fenton, St. Louis Co., Missouri. 



Dr. Shuinard, in his journal of observations along tlie routes 

 travelled by the expeditions between Indianola, Texas, and 

 the valley of the Mimbres, New Mexico, mentions this spe- 

 cies as occurring- in the mountains near the Ojo de la Soledad in 

 the Carboniferous crystalline limestones. An undescribed PMl- 

 lipsia is also mentioned by tliis author as occurring in the Gua- 

 dalupe Mountains. (A Partial Eeport on the Geology of Western 

 Texas, consisting of a General Geological Report and a Journal 

 of Geological Observations along the routes traveled by the expe- 

 ditions between Indianola, Texas, and the valley of the Mimbres, 

 etc.; G. G. Shumard, Austin, 1886, pp. 95 and 113. 



PHILLIPSIA INSIGNIS, AVincliell. 



Phillipsia insignis, Wincliell, 1863, Proc. Acad. Nat. Sci., Vol. VII, 2d se- 

 ries, p. 24. 

 PMllipda insignis, Billings, 1863, Can. Nat. , Vol. VIII, p. 209. 

 Phillipsia insignis, Herrick, 1887, Bull. Sci. Lab. Denison Univ., II, p. 63, 

 We subjoin the original description : 



"Head paraboloid ; border wide, broadly and deeply furrowed, with the 

 margin reflected upw^ard, and the lateral angles continued posteriorly in 

 acuminate prolongations, reaching twice the length of the glabella from the 

 anterior end ; the margin and reflected portion of the test marked by fine 

 longitudinal stride. Glabella elongate-paraboloid, tuberculaled. In the 

 middle of the posterior border of the glabella is a pair of tubercles, and in 

 front of these a second and third pair, the last resting on the middle of the 

 glabella — the w^hole so arranged as to form two longitudinal rows ; opposite 



