228 PALEONTOLOGY OF NEW JERSEY. 
in the Mineral Conchology, being less elevated above and less convex 
below, and never umbilicated; while that one is only covered at the um- 
bilicus when very old. Sowerby also distinctly states that that shell never 
attaches foreign substances to its surface, while this one is quite covered, 
and principally by small stones, even where shells appear to have been 
abundant. In this respect it differs quite notably from Thorus leprosus 
Morton, as that one principally used shells, and those frequently of large 
size enough to quite disfigure the casts, while those of this species are 
quite regular in outline. 
Formation and locality: In the upper layer of the Upper Green Marls, 
common at Shark River, New Jersey. I have also seen it from Farm- 
ingdale. 
SOLARITD. 
Genus ARCHITECTONICA Bolton. 
ARCHITECTONICA ANNOSA. 
Plate xxxIv, Figs. 23-27. 
Onustus annosus Conrad: Am. Jour. Conch., vol. 5, p. 42, Pl. 1, Fig. 4. 
Comp. A. (Solarvwm) elaborata Con.: Tert. Foss. N. A., Pl. xvut, Fig. 4. 
Mr. Conrad figures in the Am. Jour. Conch., loc. cit., under the name 
Onustus annosus a specimen which I judge to be the cast of a species of 
Architectonica, which is rather common in the Shark River Eocene Marls. 
The specimens which I have figured under the above name were at one 
time studied by him, and I presume the figure in the Journal was drawn 
from one of them. External casts, or imprints of the exterior, however, 
show quite distinctly that the shells were of the nature of the genus Arch- 
itectonica Bolton—Solariwum Lamarck. Mr. Conrad’s description of his 
Onustus annosus is as follows: ‘‘ Rather elevated; volutions five, rounded, 
slightly channeled at top, and sculptured with revolving lines, which are 
obliquely crossed by others, giving the cast a rugoso-tuberculated aspect; 
lines on the last volutions five or six in number; periphery acute.” 
There is nothing embraced in this description that might not apply 
equally well to a species of either of these genera, unless it be the feature of 
