CONCHYLIA— D/TifFi?^. xxvii. 



9. fragilis, flexurd longitudinali anticd. 



with a longitudinal flexure at the anterior side. 



10. radiata, striis minutis longitudinalibus, reticulata. 



reticulate by minute longitudinal striae. 



24. GOODALLIA. 



1. triangularis, margine interno denticulato. 



with the inner margin toothed. 



2. minutissima, margine interno integerrimo. 



with the inner margin very entire. 



25. SOLEN. 

 * valvis unidentatis. 



with a single tooth in each valve. ■ 



1. Vagina; dentihus complanatis. 



with the teeth flattened. 



2. Novacula, dentibus conico-acuminatis 



with the teeth rather conic and pointed. 

 ** valvd altera hidentatd. 



with two teeth in one valve. 



3. Siliqua, rectus, dente solitario hastato-acuminato . 



straight, with the single tooth spear-shaped and 

 pointed. 



4. Ligula, rectus, dente solitario obtuso fisso. 



straight, with, the single tooth obtuse and cloven. 



5. Ensis, subarcuatus, dentibus simplicibus. 



slightly curved, with the two teeth simple. 

 *C2 



