BIBLIOGRAPHY OF PALAMOZOIC CRUSTACEA 121 
WALCOTT (Charles D.)—Continued 
Merostomata: Sidneyia inexpectans Wale. 
Habelia n. gen., H. optata n. sp. Emeraldella n. gen., E. brocki n. sp., E. micrura 
n. sp. Molaria n. gen., M. spinifera n. sp. 
Family undetermined. Nathorstia n. gen., N. transitans n. sp. 
The specific name transitans to this species was given on account of its suggesting a 
transition between Merostone-like form, such as Molaria spinifera and the trilobites. 
Class Crustacea: Order Anostraca—Calman Opabinidae, new family. Opabinia 
n. gen., O. regalis n. sp.. O. media n. sp. Leanchoilia n. gen., L. superlata n. pp. 
Yohoia n. gen., Y. tenuis n. sp., Y. plena n. sp. Bidentia n. gen., B. difficilis n. sp. 
Order Notostraca—Calman Naraoidae n. fam. Naraoia n. gen., N. compacta n. sp. 
Burgessidae new fam. Burgessia n. gen., B. bella n. sp. 
Genus Anomalocaris Whiteaves, 4. gigantea n. sp. 
Waptidae: Waptia n. gen. W. fieldensis n. sp. 
Hurdia n, gen. H. victoria n. sp., H. triangulata n. sp. 
Tuzoia n. gen., T. retifera n. sp. 
Odaraia n. gen., O. alata n. sp. Fieldia n. gen., F. lanceolata n. sp. 
Carnarvonia n. gen., C. venosa n. sp. 
Mollisonia n. gen., M. symmetrica n. sp., M. gracilis n. sp., M. rara n. sp. 
Tontoia n. gen., T. kivaguntensis n. sp. 
Cambrian Geology and Paleontoloey—2, No. 8. The Sardiman 
Cambrian genus Olenopsis in America. 
Smithsonian Misc. Coll., vol. 57, No. 8, 1912, with plate 36. 
The author describes and figures Olenopsis zoppii Meneghini, O. agnesensis n. sp. 
O. americanus n. sp., O. roddyi n. sp. 
Dr. Bornemann distinguishes Olenopsis from Olenus, on account of its having a 
small, rounded tail shield, with unsegmented axis; by the particularly semicircular 
outline of the cephalon; the conic, nearly smooth, glabella, and 14 or 15 body segments. 
Cambrian Geology and Paleontology—2, No. 9. New York 
Potsdam, Hoyt Fauna, with plates 37-49. 
Smithsonian Misc. Collection, vol. 57, No. 9, 1912. 
Crustacea: 
Ptychoparia minuta Bradley, P. matheri n. sp. Conocephalina whitehallensis n. sp. 
Pagodia seelyi n. sp. Agraulos saratogensis Walc. This species was described as 
Bathyurus armatus Billings (Walcott, 32 Ann. Rep. N. Y. State Mus., p. 131) and as 
Ptychoparia (A.) saratogensis Walcott (Bull. No. 30, U. S. Geol. Sur., p. 21). Lonch- 
ocephalus calcifernus Walcott, previously described under the genus Conocephalites 
and Ptychoparia. 
The species is closely related to Lonchocephalus wisconsensis Owen. It differs in 
having a relatively shorter frontal limb and longer palpebral lobes. 
Ptychaspis speciosus Walcott. 
Dicellocephalus Hartti Walcott. This was the Conocephalites hartti Walc. (32 Ann. 
Rep. N. Y. State Mus., p. 130). 
The species differs from Dicellocephalus minnesotensis in details, but it appears to 
come within the limits of the genus. 
Dicellocephalus tribulis n. sp. allied to D. misa Hall. 
The author also describes and illustrates several tracks of crustaceans under Owen’s 
gen. Protichnites. The author remarks that the particular trilobite that left tracks on 
the beaches of Potsdam sandstone time were undoubtedly species of the genus Dicello- 
cephalus. 
