SOWERBY : MARINE SHELLS Oi' SOUTH AJFRICA. 1^5 



Tellina Ponsonbyi Sow. n. sp. (pi. iii, fig. i). 



T. testa subovalis, ceqiiivalvis, cequilateralis, leviter compressa, 

 albida^ concentrice irregular iter rugata, iibique densissime 

 radiatim striata ; aniice rotundata, postice leviter angulata. 

 Umbones parviitsculi, conjundi. Margo dorsalis anticus 

 arcuatus, posticus dedivis, leviter arcuatus. Margo ventralis 

 rotunde arcuatus. Ligamentum angustuin, longiusculum, 

 immersum. Denies in utraque valva carditiales j, laterales 

 duo, reinoii. Pagina inteiiia alba. 

 Diam. antero-post 2 J mill. ; umbotw-marg. 20 mill. 



A white shell of ordinary appearance, rayed throughout 

 with very fine close strire. 



Psammobia vespertina Gmel. Scarcely distinguishable 

 firom European specimens. 



Lucina (Divaricella) liratula Sow, n. sp. (pi. iii, fig. 5). 



L. testa suborbicularis, leviter i?iflata, alba, liris transversis 

 numerosis angustissimis, hie illic undulatis sculpta. Umbones 

 acuti, approximati ; lunula pawa, profunda. Denies car- 

 dinales in valva sinistra duo, approximati iti valva dextra 

 unus, laterales in utraque valva duo vix prominentes. Fossa 

 ligamenti obliqua. Pagina interna radiatim sulcata, margo 

 crenulatus. 



Diam. antero-post 12 mill.; umbono-marg. 11% mill. 



The transverse lirse are so fine as to be scarcely visible 

 to the naked eye. 



Lucina (Loripes) lactea Lam. Like British and Arctic 

 specimens. Pretty abundant at the Cape. 



Lutraria oblonga Chem. This species, under various names, 

 seems to range ft-om the west coast of Ireland eastward to 

 the Philippine Islands, and southward to the Cape. It is 

 taken for granted by most authors that those found in 

 Australian and Indo-Pacific waters must be specifically 

 distinct from the European, but I can find no reliable 

 character by which to distinguish them. 



