294 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Yol.^I. 



individuals ; and a single Lepisraa. 26 specimens of Termitina have been 

 found, belonging to six species and three genera; among the specimens 

 is a single worker, with one exception the only one that has ever been 

 found fossil; four of the species and two genera belong to the section 

 with branched, the others to that with uubranched scapular vein. This 

 is the same pro]>ortion as holds with the sixteen species of the European 

 tertiaries, where eleven belong to the first, five to the second section ; of 

 living types, on the contrary, only 35 per cent, belong to the first, 65 per 

 cent, to the second section. Three of the species belong to a distinct genus 

 which I call Parotermes, apparently peculiar to America, but possibly 

 inckiding some from the European tertiaries ; another is doubtfully re- 

 ferred to Hodotermes, which has furnished fossil species from several 

 localities in Europe, as well as among living forms; while the other two 

 probably belong to Eutermes and are allied to species from Kadoboj, 

 placed with many modern types in this group. Calotermes, which has 

 furnished species from amber and the Ehenish basin; Termopsis, which 

 has more fossil (amber) species than recent ; and Termes proper, which 

 is represented at Oeningen and Eadoboj, as well as in amber and on the 

 Khine — all seem to be wanting at Florissant; the composition of the 

 tertiary white-ant fauna of of Florissant therefore differs considerably 

 from that of any locality in Europe; but it most nearly resembles that 

 of Radoboj in Croatia, where a like number of species has been found. 



A single i^late is devoted to the Arachnida, of which there are about 

 30 species and more than 70 specimetis ; all of them are Araneae ; they 

 have not yet been carefully studied, but fully half of them appear 

 to be Epeirinae ; of the others there are from three to five species each of 

 Theridioidae, Drassoidae, and Thomisinae, and one or two each of Aga- 

 lenoidae, Dysderoidae, and perhaps Attoidae; they belong, therefore, 

 mostly to the highest groups. Among the Epeirinae is one genus repre- 

 sented by several species, which seems distinct from any that have been 

 characterized ; it is a compact, short-legged form, whose front and sec- 

 ond legs are remarkably stout. Unfortunately the eyes are scarcely ever 

 l^reserved in any of these fossils and the correct determination of their 

 afBuities rendered much more difficult and uncertain. There is one 

 striking form, a species of Kephila, with spreading bunches of hair on 

 its legs as in our N.^plumipes^ but yet diflering decidedly from that. As 

 a whole the arachnid-fauna appears rather uninteresting, and to have 

 few features in common with that of the Prussian amber. 



The only Myriapod is a large species of lulus, represented by half a 

 dozen fragments, in which only the body segments are preserved. 



Finally there is an odd form of animal, which although abundant and 

 tolerably preserved is still of doubtful i^osition. It is flattened onisci- 

 form in shape, the body generally arched, and appears to be formed of 

 only four nearly equal segments ; each of tbe first three bears a pair of 

 long swimming (?) legs bearing a two-jointed tarsus armed with a single 

 claw, both femur and tibia being compressed, expanded, and the latter 

 fringed with hairs. The first segment has a median slit anteriorly, but 



