233 On new Species o/Cerltluum, etc. 



other two row?, wliereas in C. armatum they are much more 

 prominent and anguhir. 



I have pleasure in dedicating this shell to Monsienr L. 

 Vignal, of Paris, who has made a special study of the 

 Cerithidse, and to whose judgment I submitted specimens 

 before venturing to describe the species as new. 



Fig. 1. — Cerithium viynali Fig. 2. — Clanculus gibbonsi 

 (nat. size). (enlarged). 



Clanculus gibbonsi, sp. n. (Fig. 2.) 



Testa conico-globosa, anguste umbilicata, alba, maculis parvis 

 nigris, interdum confluentibus, conspersa ; spira conica, elati- 

 uscula, convexiuscula ; anfractus 5, convoxiusculi, fuuieulis -4 

 creberrime granulosis cingulati ; sutura caualiculata ; anfractus 

 idtimus I altitudinis testse sequans, ad peripberiam angulatus, 

 funiculis 2 validis granosis munitus ; basis convexa, liris con- 

 centricis 7-9 minute granulosis nigro articulatis instructa, 

 area umbilicalis valde plicate callosa ; apertura subrotundata, 

 leviter obliqua, intus albo-margaritacea, iucrassata, valde lirata ; 

 columella irregularitor rugose plicata. 



Alt. 9, lat. 8 mm. 



Ilab. Zanzibar. 



In form the shell somewliat resembles tliat of C. scahrosus 

 (Phil.), but is much smaller, while the character of the colu- 

 mella and strongly plicate umbilical callus suggest an affinity 

 with C. gui'naicus, which is a much larger species and 

 very different in form. 



SoletelUna {Psammokvd) gibbonsi, sp. n. (Fig. 3.) 



Testa subovalis, foro sequilateralis, paulo inflata, tenuis, sub epider- 

 midepurpurascens, couccntrice irregulariter Urate rugata, sub lente 

 hie illic subtilissime oblique scalpturata ; margo dorsalis anticus 

 declivis, leviter convexus, posticus convexe subtruncatus ; latus 



I 



