328 0. D. Walcott—New Genus of Cambrian Trilobites. 
near the posterior extremity. Length to Hab- 
itat.— A infusion of dead leaves. Sande BeAr iy cae 
fissio 
The ect of the unique, one-sided arrangement of the 
adoral oilia is to direct food particles to the mouth. hen the 
oo rear is quietly feeding, the cilia of the general cuticular 
surface are all quiescent, with the exception of those on the 
right- hand side in advance of the adoral, lateral hedge of setose 
.. These alone being in motion, the currents whic 
distinguished Heat the animalcule is resting and these appen- 
dages are motionless. The infusorian is shown in. its fA 
hand lateral aspect by fig. 22, and the projecting pharyngea 
cilia in fig. 23. 
Trenton, N. J. 
EXPLANATION OF FiGURES—PLATE III. 
Fig. 1. Physomonas vestita, sp.nov. x 667. 
Fig. 2. Bicoscca lepteca, sp. nov. x 12 
Fig. 3. Bicoseca leptostoma, sp.nov. x 1200, 
Fig. 4. Bi longipes, sp. nov. x*1200. 
Fig. 5. Stylobryon Abbotti, sp. nov. x 600. 
Fig. 6. Derepyxis amphora, gen. et. sp. nov. x 900. 
Fig. 7. Derepyzis ollula, sp eis x tg 
Fig. 8. Chi ata, 8 1575. 
Fig. 9. Ch. ovata after conjgaton with empty cuticular sac adhering. 
Fig. 10. Ch. ovata in conju 
Fig. 11. Loxophyllum flexilis, ag v. x 260 
Fig. 12. Spirostomum loxodes, sp. nov. x 187 
Fig. 13. Vaginicola leptosoma, sp. nov. x 180 
Fig. 14. Cothurnia anulata, sp. nov. x 677 
Fig. 15. J culosus, sp. nov. x 100 
Fig. 16. Liton inatus, sp. nov. x 360. 
Fig. 17. Litonotus trichocystus, sp. nov. x 350 
Fig. 18. Chi uviatilis, sp. no hg 
Fig. 19. Chilodon ca latus, sp. nov. 
Fig. 20. @ 
. Oh. caudatus in posterior, longitudinal optic section. Diagram. 
Fig. 21. Tillina Sev, Sp. nov. ss 
Fig. 22. reas plagia, ge ag 
Fig. 23. D. grok eowing STiation of the ae 
a 
Art. XLIII.— Paleozoic ei New Genus of of Co 
bites, Mesonacis; by CHARLES D. WaLc of the UD 
States Geological = Cibenara 
fo 
ling collecting fossils at Parker’s quarry, in the tee 
Georgia, Vermont, in the season of 1883, we found pe Af 
of Otncllus Vermontana that appeared to have a y 
