112 SAN DIEGO SOCIETY OF NATURAL HISTORY 
ULRICH (E. O.) and BASSLER (Ray S.)—Continued 
lacunata (Beyrichia lacunata J. & H.), T. (Kiesowia) mamillosa (Beyrichia mamillosa 
Krause), T. marchica (B. marchica Krause), T. marchica angustata (B. marchica var. 
angustata Krause), T. marchica lata (B. marchica var. lata Krause), T. palmata 
(Beyrichia palmata Krause), T. quadrilirata (Beyrichia quadrilirata H. & W.), T. 
(Kiesowia) radians (B. radians Krause), T. ribeiriana (B. ribeiriana Jones), T. sim- 
plex (T. quadrilirata var. simplex Ulrich), T. subquadrans Ulrich. 
Ceratopsis Genotype Beyrichia Chambersi Miller. 
The genus includes C. robusta Ulrich, C. intermedia Ulrich, C. oculifera Hall, all 
Upper Ordovician species, and C. hastata (Beyrichia hastata Barr.) 
Stenobolina Genotype Beyrichia ciliata Emmons. 
Group of Ctenobolina ciliata. 
Ordovician species: 
Ctenobolina alata Ulrich, C. bispinosa Virich, C. ciliata Emmons, C. curta (C. ciliata 
var. curta Ulrich), C. Dury: (Beyrichia Duryi Miller), C. emaciata* (C. ciliata var. 
emaciata Ulrich), C. Guillieri (B. Guillieri Yormelin), C. Hammelli (B. Hammelli 
Miller and Faber), C. obligua Ulrich, C. oblonga (Entomis oblonga Steusloff). 
Silurian species: 
Ctenobolina granosa Ulrich, C. punctata Ulrich. 
Devonian species: 
Ctenobolina papillosa Ulrich. 
Group of Ctenoholina subcrassa. 
Ordovician species: 
Ctenobolina crassa Ulrich, C. fulcrata Ulrich, C. impressa (Entomis impressa Steus- 
loff), C. major (Bollia major Krause), C. minor (Bollia minor Krause), C. subcrassa 
Ulrich, C. umbonata (Entomis umbonata Steusloft). 
Silurian species: 
Ctenobolina auricularis (Bollia auricularis Jones). 
Devonian species: 
Ctenobolina mimima Ulrich. 
Mississippian species: 
Ctenobolina loculata Ulrich. 
Drepanella. Genotype D. crassinoda Ulrich. 
Ordovician species: 
Drepanella ampla Ulrich, D. bigeneris Ulrich, D. crassinoda nitida Ulrich, D. 
elongata Ulrich, D. macra Ulrich, D. Richardsoni (Beyrichia Richardsoni Miller), D. 
Richardsoni canadensis Ulrich. 
This wholly American genus is remarkable for the extreme variability of the nodes 
within the central area of the valves. 
Scofieldia new genus. Genotype Drepanella bilateralis Ulrich. 
Treposella nov. gen. genotype Beyrichia Lyoni Ulrich. This genus proposed for a 
link in the evolution of Hollina from Beyrichia. 
Hollina new genus. Genotype Ctenobolina insolens Ulrich. 
Devonian species: 
Hollinia antespinosa Ulrich, H. armata Ulrich,.H. cavimarginata Ulrich, H. informis 
Ulrich, H. spiculosa Ulrich. 
All these species were described as species of Ctenobolina by Ulrich. 
Carboniferous species: 
Hollina granifera (Bollia granifera Ulrich), H. radiata (Beyrichia radiata J. & K.), 
variety cestriensis Ulrich, H. longispina (Beyrichia longspina J. & K.), H. emaciata 
(Beyrichia 2? emaciata U. & B.). 
The authors include under this genus Beyrichia Kolmodini and B. tricollina Ulrich. 
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