198 CALIFORNIA ACADEMY OF SCIENCES. 



On a new Crustacean from Glasgow Coal Field. 



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

 Palaocarabus russellianus n. sp. 



A monograph of British Trilobites. Pt. 3, 



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



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



Ogygia angustissiman. sp., OJ (vel. Phacops) suhduplicata, see Phacops 

 pi. XV, figs. 7 and 8), 0. ( Ptychopyge) corridensis Murch., 0. scutairix 

 Salt., 0. peltata Salt., 0. sehoyni Salt. 



Barrandia — Subgenus Homalopleon. Barrandia ( Homalopteon) port- 

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



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

 Salt. 



Asaphua — Subgenus 1, Ptychopyge Ang. Asaphus angustifrons Dalm., 

 A. latus Ang. 



Subgenus 2, Basilicus. Asaphus (Baailicus) tyrannus Murch., A. (Basi- 

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

 Murch., A. (Basilicus) marstonin. sp., A. (Basilicus?) radiatus Salt., A. 

 (Basilicus) laticostatus McCoy. Ogygia corndensisM.VLrch. 



Subgenus 3, Megalaspis. M. exte.nuatus Wahl. 



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

 affinis McCoy, A. (Isotelus) homfrayi Salt. 



Subgenus 5, Cryptonymus. Asaphus expansus Tiinne, A. (Cryptonymus) 

 scutalis Salt., A. (Cryptonymus) kowalewskii. 



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



Subgenus 8, Nileus Dalman. Nileus armadillo Dalm. 



Stygina latifrons Portl., S. murchisoni Murch., S. musheni n. sp. Psilo- 

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

 15, figs. 7-8. Ogygia (Ptychopyge) 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 primceva 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. Agnostus princeps Salt., also var. (a) ornatus, (b) rudis. 



Sec. 1. Condylopyge. Agiwstus maccoyi Salt., A. rex Barr., A. morea 

 n. sp. 



Sec. 2, Agnostus, A. pisi/ormis Linne, A. princep)s Salt., A. trisectus 

 n. sp. 



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



