Families Pedicular iidae and Omdidse. 

 FAMILY PEDIC ULARIID^E. 



Shell small, limpet-like, irregular, with a short spire which 

 becomes concealed with the growth, the surface rad lately ribbed 

 when young ; mouth large and wide, subcanaliculated in front, 

 the lips irregular, simple in the adult, the inner one callously 

 excavated, no operculum. 



Animal with small foot, mantle-margin thickened, not reflected 

 over the shell, siphon not produced, eyes sessile at the external 

 base of the tentacles. Dentition 3*1 *3, the central tooth sub- 

 quadrangular, multicuspidate, the laterals transverse, multi- 

 cuspidate, the marginals long and narrow, with three profound 

 digitations ; exterior to the marginals is a small supplementary 

 plate (PI. 1, fig. 1). 



Young shells have the regular form of Trivia (to which the 

 dentition approximates), with a plicate columella and dentate 

 lip, but its parasitic habits (on polyps) cause subsequent irregular 

 growth, so that its relationships were for a long period very 

 uncertain. The dentition fixes its place between Cyprseidae and 

 Ovulidte. 



Genus PEDICULARIA, Swainson, 1840. 



Characters, those of the family. Very few species are known, 

 but the geographical range of the genus is world-wide in warm 

 seas. Fossil, miocene of Sicily. 



The subgenus Dentiora, Pease. 186'2, which is founded on a 

 shell three and a half millimetres in length, is probably a juvenile 

 Pedicularia ; it is said to be ovate, with subinflected lip, which 

 is lirate, the columella plane or excavated, ridged above, com- 

 pressed below and sharply dentate, the outer surface spirally 

 subgranosely striated. Thy re us, Phil., is a synonym of Pedicu- 

 laria. 



FAMILY PEDIGULARIID^. 



Genus PEDICULARIA, Swainson, 1840. 

 P. SICULA, Swainson. PI. 1, figs. 2, 3. 



Adult irregular, more or less compressed at the sides, having 

 a limpet-like appearance, and modified as to outline by the 

 surface upon which it lives ; the spiral lines of the young shell 

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