Yol. 68.] LOWER CAEBONirEEOTJS GASTEROPODA. 309 



Figs. 4a & 4 J. Tmetonema sitbsidcatum, sp. nov. Fig. 4 a. Front view of another ' 

 specimen, X 9. Fig. 4 b. Protoconch greatly enlarged. High 

 Smithston, Kilwinning (Ayrshire). Collection of Mr. John Smith. 

 (See p. 306.) 



Plate XXIX. 



[All the figures in this plate are of the natural size.] 



Fig. 1. Foordella tereticincta, subgen. et sp. nov. Back view. (See p. 301.) 



2. Foordella tereticincta, sp. nov. Front view of another specimen. St. 



Doulaghs, Dublin. Munich Museum. (See p. 301.) 



3. Foordella hibemica, sp. nov. St. Doulaghs, Dublin. Munich Museum. 



(See p. 301.) 



4. Foordella hibemica, sp. nov. Body-whorl of another specimen, showing 



the fold behind the columella. Kildare. Museum of Practical 

 Geology, London. (See p. 301.) 



Plate XXX. 



Fig. 1. Fithodea amplissima De Kon., natural size. (See p. 305.) 



2. Fithodea amplissi7na De Kon. Another specimen, natural size. Cork. 



Collection of Mr. Joseph Wright, Belfast. (See p. 305.) 



3. Fithodea amplissima De Kon. A specimen figured by De Koninck, 



natural size. Vise. Brussels Museum. (See p. 305.) 

 ' 4. Fithodea percincta (Portlock). Holotype, natural size. Derryloran 

 (Tyrone). Museum of Practical Geology, London. (See p. 305.) 

 Figs. 5a-5d. Trechmannia trochiformis, subgen. et sp. nov. Fig. 5 a. Front 

 view, X 2. Fig. bb. Back view, X 2. Fig. 5c. Portion of penul- 

 timate whorl showing structure of band, X 6. Fig. 5 d. Portion of 

 band shov/ing lines of growth, X 10. Stanhope-in-Weardale. Trech- 

 mann Collection. (See p. 303.) 

 6a & 6 6. Microptychis wrighti, gen. et sp. nov. Fig. 6a, X 2, Fig. 66. 

 Portion of two whorls, showing outlines, X 3. Little Island, Cork. 

 Wright Collection. (See p. 307.) 



