NATURAL SCIENCES OF PHILADELPHIA. 133 



Goniatites Allei, Win. The most perfect specimens seen were collected 

 by A. W., at Germain's quarry, Hillsdale, Michigan. Apertural constrictions 

 occur at regular intervals. 



Goniatites Marshallensis, Win. Collected by A. W., at Napoleon Cut, 

 Jackson county, Michigan. 



Occurs also at Weymouth, Medina county, Ohio, 80 feet below the conglo- 

 merate. Whittlesey's collection. 



PHILLIPSIA, Portlock. 



Phillipsia Doris, Win. (=Proetus Doris, Hall, xiiith Rep. N. Y. Regents, 

 p. 112.) This species was established by Hall on some pygidia occurring in 

 the Goniatite limestone at Rockford, Indiana. I am in possession of several 

 pygidia from this locality which agree with his description, though in the ab- 

 sence of measurements, it may be that his specimens are much larger. Associa- 

 ted with these are numerous fragments of bucklers, which prove that the trilo- 

 bite is a Phillipsia. The head is furnished with a border sloping downwards, 

 and separated from the cheeks by a deep but narrow groove ; the middle of 

 the border is marked by a groove which reaches from a point opposite one 

 eye, to the corresponding point on the other side of the head ; in some speci- 

 mens the latter groove reaches backward to the posterior borders of the buck- 

 ler. The cheeks are raised abruptly above the border, and terminated by 

 spinous points which are ornamented with raised longitudinal striae, aud ex- 

 tend backwards a distance equal to one-third the whole length of the cepha- 

 lic shield. The principal lobe of the glabella is in the form of a prolate 

 semi-ellipsoid, is almost destitute of furrows, and is supported on each side 

 by a large complementary lobe. The surface is obscurely granulose. The 

 pygidium is in the form of a semi-ellipse, with the longer diameter trans- 

 verse ; it is convex, with a gibbous axis, obtuse posteriorly, and articulated 

 to the extremity. The lateral lobes are a little narrower than the axis, and 

 their terminal points join the extremity of the axis. The pygidium is bor- 

 dered by a plain belt curved downwards around its margin, and barely mark- 

 ed by a continuation of the articulations* except the two which bound it 

 anteriorly. Number of segments in the axis, 1 1 ; in the side lobe, 7 ; surface 

 the same as in the buckler. 



Width of pygidium, -35 ; length, *21 ; width of axis at anterior end, -12 ; 

 width of border, -04. Length of buckler of another specimen, -31. 



Proetus Missouriensis, Shumard, (Missouri Report, p. 196, pi. B, fig. 13, a, b,) 

 would seem also to be a Phillipsia, as well as its Ohio representative, Proetus 

 auriculatus, Hall, (xv. Rep. N. Y. Regents, p. 107.) Pictet says of Proetus, "La 

 glabelle est lob6e par des sillons," and of Phillipsia, "La glabelle est com- 

 posee d'un grande lobe median simple, et de deux petits lobes latero-poste- 

 rieurs."' Furthermore, Proetus Swallovi, Shumard, (loc. cit.J does not pre- 

 sent the posterior termination of the great suture required by the genus to 

 which it stands referred. 



Phillipsia Rockfordensis, n. sp. Cephalic shield surrounded by a nar- 

 row, convex border, which is bounded internally by a narrow but deep 

 groove, and terminates posteriorly in conically tapering genal points. The 

 principal lobe of the glabella is relatively very large, convex, highest in the 

 middle, widened anteriorly, circularly rounded in front, and gently curved on 

 the sides ; no glabellar furrows are present. The complementary lobes are 

 large, oval, and project laterally farther than the main lobe. The surface of 

 the test of the glabella is finely, but sharply granulated ; that of the border 

 is finely striated. Size about the same as that of P. Doris. 



Collected by A. W., at Rockford, Indiana. 



Cythere crassimarginata, Win. Collected by A. W., at Alan's and Ger- 

 main's quarries, Hillsdale, Michigan. 



University of Michigan, Ann Arbor, 13th May, 1865. 



1865.] 



