T. E. Savage — New Species of Arthropods. 149 



Art. XY. — Some Interesting New Species of Arthropods 

 from Devonian Strata of Illinois ; by T. E. Savage. 



The first species here described is Lepidocoleus illinoiensis 

 n. sp., a barnacle from the Clear Creek (upper Oriskany) chert 

 in Union County, Illinois. The specimen is not complete, a 

 piece having been broken from each end. It is of unusually 

 large size, the incomplete fragment measuring 33 mm in length. 

 The specimen is preserved in the form of a cast in the chert, but 

 is almost free from the matrix so that the entire length of one 

 side of the fragment and the greater portion of the other side 

 are exposed. The angular dorsal edge and the greater part of 

 the ventral edge can also be seen. There are two vertical rows 

 of imbricating plates, of which 17 can be counted on one side 

 and 13 on the other. It is apparent that several more plates 

 are needed to complete test. The plates alternate in position 

 along an angular line which is considered the dorsal edge, as 

 shown in fig. 2. The plates are gently convex, and overlap 

 for one-half or more of their length. They are oblong in shape, 

 with rounded corners, and are unsymmetrical, the apex being 

 situated at the free end of the dorsal edge. The plates are 

 ornamented with fine, thread-like lines which run parallel 

 with the dorsal border and the free margin to the ventral edge, 

 as shown in fig. 3. The two sides of the specimen are some- 

 what unequally convex, probably on account of compression 

 which has slightly flattened one side and has caused the plates 

 on the flattened side to overlap those of the other series along 

 their free ventral edges, as seen in fig. 1. 



The only known species that approaches this specimen in 

 size is Lepidocoleus polypetalus, described by J. M. Clarke 

 from the Helderberg limestone of New York. From the latter 

 our species differs in being somewhat smaller and in tapering 

 less rapidly from below upward. The plates also are less con- 

 vex and more uniformly curved than those figured by Dr. 

 Clarke. 



The other species described in this paper is a trilobite, 

 Dalmanites palaceus n. sp., also from Union County, 

 Illinois, where it occurs in strata that correspond in age to 

 some part of the New Scotland formation of New York. The 

 specific name is a Latin adjective signifying shovel-form and 

 was suggested by the shovel-shaped extension at the anterior 

 part of the head. 



The head is semi-elliptical in outline to the ends of the genal 

 spines which are directed nearly straight backward and are 

 slightly longer than the glabella. It measures 23 mm in length, 



