C A K D I L I A. 



Plate L 



Genus CARDILIA. Duhayes. 



Tisiii biralris. aquiealcis, iiiO'juilaieralif, uwtbonibus 

 productis, injlatii. gptralibus. Cardo teniiis. dente 

 cardi'nali minimo, fovtolA post dentem etiam minimd. 

 Infra umbonfm processus eochlcortjaraus ligamenbim 

 continens. Impressionis musculares dualnis. pC'Stica 

 in laminem septiuirirtem projicta, antica ScViilunan's. 



Shell bivalve, equivalve, iEequilateiaL with produced, 

 inflated, spiral unibones. Hinge thin, with a very 

 smaU cardinal tooth and a very small fossene be- 

 hind the tooth. Below the umbones is a sfKXjn- 

 shaped projection containing the ligament. Mus- 

 cular impressions two, the posterior one projected 

 ia a septiiorm lamina, the anterior semilunar. 



The liMmentJierous pit on a spoon-shaped process 

 in the hinge seems to remove this little genus ot shells 

 from the neighbourhood of the family of CAEr)LiCi.£:, in 

 which it has been placed. The posterior muscle mark 

 being projected into a sort of shelf or septum is ana- 

 logous to that of CucuUaa. As forming a genus, the 

 Cardilix. of which only three species are known. -:and 

 alone. They are irom China aud the Philippines. 



Species 1. (Mus. Brit.) 



Caedilia SEsnsrLCATA. Car. tcstd crass>j. subovata, alia, 

 antice leevi. pcstice prope marginem dtcussaid, iudi 

 usqui ad medium raJi'atim inter liras raiidas prc- 

 jundi sulcata : margine pcstico-vtntrali acMi dfn- 

 taio: umbonihus prominentiius, lateraHbus. spi- 

 raliter incurris. 



The half-suijCated Caedelia. Shell thick, sub-ovate. 

 white, smooth in iron:, decusated near the margin 

 posteriorly, iLence to the middle radiately deeply 



suicated between strong ridges : posterior- ventral 

 margin sharply toothed; umbones prominent, 

 lateral, spirally incurved. 



L.ucAf:cK. £J. Dcshai/cs. 



Hah. China. 



The ribs in this species are distinct and srrons. 



Species 2. (Mus. Brit.) 



Caediua n.-EEi!is. Car. testa guhquadnttd, tenvi. aibd. 

 anticd l<en. po$txc> ienmssmi radiatim striata; 

 vmbinibus parnOseulis, terminal ibus ; margine pos- 

 tico-vintrali ienuiter serrato. 



Tex csAF.iiED Caedilia. Shell subquadrate. thin, white. 

 .smooth in front, posteriorly very nnelv radiaielv 

 striated : umbones rather small, terminal ; pos- 

 terior-ventral margin finely irriaied. 



Deshatls. Ed. LamarcL: 



Eat'. Philippines. 



More square in form snJ having the umbones less 

 prominent than the typical species. 



Species 3. (Fig. a, h. c. Mus. Brit.) 



Caedilia Map.tixii. Car. tistd perpendiculariter cb- 

 lon-ja. gub-jratd. alb-i. dntici el medio lavigatd, 

 pjitice subangnlaid. g>dcatd ; margine pcetico- 

 vcntraii dentato ; wriMnibus produeiis, talide cwn's. 



Mabtixi's Caedilia. SheU perpendicularly oblong, 

 rather ovate, white, smooth in the front and 

 middle, rather angular and sulcated : posterior- 

 ventral margin toothed ; umbones produced, much 

 curved. 



DiiSATx;. Ed. .' Lavtorcl. 



Hah. China. 



December. 1873. 



