120 SAN DIEC.O SOCIETY OF NATURAL HISTORY 



WALCOTT (Charles D.}— Continued 



The following species are referred to the genus: Calla-via hicrnsis Wale, C brog- 

 geri Wale, C. hurri Wale, f.'. ctill/ivci I.apvv., C. corllatuii Kaw. Mss., C. crosbyi 

 Wale, and C. nevaJensis \\'alc. 



Holmia Matthew genotype Parailoxides Kjcritlfi Linnarsson, 1871. 



The species referred to Holmia are H. kjenilfi, //. liirulgreu'i anti //. ro-ivei Wale, 

 the only American species. 



Wanneria new genus. Genotype Jf. It'alcoltariiis W^aiuier. 



This genus has a uniform series of thoracic segments, with pleurae terminating in 

 broad falcate extensions beyond the body line, without the spinose ends as in Holmia. 



The species referred to Wanneria are: W. 11' aUoltaints \Vanner, //'. gnu lie Wale 

 and W. Halli Walcott. 



Paedeumias n. gen. CJenotvpe /''. transilans Walcott. 



The distinctive characters of the genus are in the presence of the rudimentar\' seg- 

 ments and pygidium. 



Ole/irlliis Hall. Genotype O. Tliompsoni Hall. 



The author remarks that Olrtiellus Tlinmpson'i passes througii a Holmia and Paedeu- 

 mias stage" before becoming a true Olenellus. 



The American species are Olenellus Thompsoni Hall and ^■3riety (). erassimarginaius 

 Walcott, 0. gilhertl Meek, 0. fremonti \\'alc., (h eaiuulensis ^^'alc., (). claytoni Wale, 

 O. argentus Wale, O. ^vahotti S. & F. 



The European species are O. :^igas Peacii, (). lap-v.-ortli'i Peach, 0. relieulatus Peach 

 and Olenellus n. sp. undt. 



All these species have telsonated pygidin arui rnii\ he classed under the family name 

 of Olenellidae. 



Peachella new genus. Genotype P. iddmgsi Walcott. 



The genus is only known by the heati, which has blunt, tumid genal spines; elon- 

 gated, narrow glabella; small eyes and marked convexity. 



Olenelloides Peach. Cienotype O. arrnatus Peach. 



This genus is clearly defined by its large cephalon and primitive thorax and py- 

 gidium. The author remarks it is essentially a larval form of Olenellus. The author 

 diagrammatically represents these Lower Cambrian genera under the family of Meson- 

 c'ldae. Left-hand branch Nevadia, Callavia, Holmia, Wanneria, — Paradoxides. Right- 

 hand brancli Nevadia, Mesonacis, Elliptocephala, Paedeumias, Olenellus, Peachella — 

 Ollenoides. 



Caiiihriaii Geology and Palu'ontoloiiy, No. 7. Canibro-Ordo- 



vieian l>()iiiulai"y in Kritisli Cohimbia. Avitli desci-iption of Fossils. 



Smithsonian Mis. Coll., vol. 57, No. 7, 1912. 



The author describes Certopyge canadensis n. sp. 



This species differs from C. forflrula Sars in the greater length of the frontal limb 

 of the cranidium, longer palebral lobes and narrower fixed cheeks, etc. 



Cambrian Geology and Pahpontology — 2. No. 0. .Aliddlc Cam- 



brian Bi'a<'biopoda. Malacostraca Trilobita and iMcrostoiiia. ^\ilh plates 

 24 to ;J4. 



Smithsonian Mise Coll., vol. 57, No. 6, 19i:. 



Under the class Malacostraca, the author describes the following species: 



Hymenocarls clrcularls n. sp., //. ohllqua n. sp., 77. avails n. sp., //. parva n. sp., 

 H. per feet a n. sp., 77. verinlcauda. 



Trilobita: Neolerius sriralus Rominger. Plychoparla cordlllerae Rominger. Mar- 

 rella n. gen., M. spendens n. sp. 



