198 CALIFORNIA ACADEMY OF SCIENCES, 



On a new Crustacean from Glasgow Coal Field. 



In Quart. Jour. Geol. Soc. London, vol. 19, 1863, p. 519, ligs. 1, 2, 

 PaJceocarnbns russellianus n. sp. 



A monograph of British Trilobites. Pt. 3, 



pp. 129-179, pis. 15-25. 



In Fallot. Soc. London, vol. 18, for 1864 (London, 1866). 



Ogygia angustlssiman. sp., OJ (vel. Phacops) subdiiplicata, see Phacops 

 pi. XV, figs. 7 and 8), 0. ( Plychopyge) corrklensis Murch., 0. scutatrix 

 Salt., O. peltaia Salt., 0. selioyni Salt. 



Barrandia — Snbgenus Homalopteon. Barrandia ( Homalopteon) port- 

 loclci Salt., B. (Homalopteon) radians McCoy. 



Subgenus Barrandia. B. (Barrandia) cordai McCoy. Niohe homfrayi 

 Salt. 



Asaphus — Subgeniis 1, Plychopyge Ang. Asaphns angusiifrons Dalm., 

 A. latus Ang. 



Subgenus 2, Basilicus. Asaphns ( Basilicua) tyrannus Murch., A. ( Basi- 

 licus) peltastes n. sp., A.^ (Basilicus) hybridus n. sp., A. ( Basilicus) powisii 

 Murch., A. ( Basilicus) mar stoni n. sp., A. (Basilicus? ) radiatus Salt., A. 

 (Basilicus) laticostatus McCoy. Ogygia corndensis'Mwxch.. 



Siibgenus 3, Megalaspis. M. extenuatus Wahl. 



Subgenus 4, Isotelus. Asaphus (Isotelus) gigas Dekay, A. (Isotelus) 

 affinis McCoy, A. (Isotelus) homfrayi Salt. 



Subgenus 5, Cryptonymns. Asajihus expansus Linne, A. (Cryptonymus) 

 scutalis Salt., A. (Cryptony7mts) koioaleivskii. 



Subgenus 6, Symphysurus Goldf., tyjDe S. palpebrosus Dalm. 



Subgenus 8, Nileus Dalman. Nileus armadillo Dalm. 



Stygina latifrons Portl., S. tnttrchisoni Mnrch., S. musheni n. sp. Psilo- 

 cephalus innotatus Salt., P. inflatus Salt. Phacops subduplicata Salt., pi. 

 15, figs. 7-8. Ogygia (Plychopyge) cordensis Murch. Illcenopsis thomsoni 

 Salt., pi. 20, figs. 1, 2. 



Figures and descriptions illustrative of British 



organic remains. Decade XI. Trilobites (chiefly Silurian) 



In Mem. Geol. Survey United Kingdom, London, 1864, 10 pis. 



The article on Salteria primava n. g. et sp., pi. 6, was edited by 

 P. Wyville Thomson. 



The genera are arranged in this work in the following order: 



PI. 1. A gnostus prince ps Salt., also var. (a) ornatris, (b) rudis. 



Sec. 1. Condylopyge. Agnostus maccoyi Salt., A. rex'B&rv., A. morea 

 n. sp. 



Sec. 2. Agnostus, A. pisiformis Linnt-, A. princeps Salt., A. trisectus 

 u. sp. 



Sec. 3. Trinodus. A. tardus Barr., A. trinodus Salt., A. limbatus n. sp. 



