OF MOLLUSCA. 75 



dissimilar ; first transverse, with four unequal sharp points ; second 

 and third bent back, similar, slender, elongated, slightly sigmoid, the 

 tip cleft into three spines, the outer short, the inner longest ; the 

 limb with a transverse plate, which is curved and ovate (fig. 42). 



The shell of Pedicularia has much the appearance of Concholepas, 

 for it only differs from that genus in having no tooth-like process on 

 the front of the outer lip, and in the edge of the outer lip being 

 generally sinuous, and the inner or columellar lip being rounded, 

 callous, and covering part of the left side of the last whorl. There 

 is a small white shell in Mr. Cuming's Collection from the Philip- 

 pines, which has similar characters, and is even more like the typical 

 Concholepas. 



Mr. A. Adams has thus described the shell, which he referred to 

 a genus under the name of Coralliobia : " Like Concholepas, but no 

 teeth on front of outer lip." — Ann. ty Mag. N. H. 1854, 70. 



The form and disposition of the teeth at once separate the animal 

 from Concholepas and the other Purpuridce. 



Dr. Loven described the teeth of Pedicularia directly after Calyp- 

 trceadee, and Dr. Philippi arranges it as the last genus of CalyptrcB- 

 acea. — Handb. der Conch. 189. 



Fam. V. APORRHAID.E. 



Outer edge of the mantle expanded, lobed or reflexed on the edge 

 of the shell. Shell spiral when adult ; outer lip expanded or revo- 

 lute. Operculum annular. 



1. Aporrhais. 



Shell fusiform ; aperture narrow ; canal distinct ; outer lip di- 

 lated, lobed. Operculum ovate. 



1 . A. pes-pelecani, t. 9 1 . f. 1-4 ; Forbes fy Hanley, B. M. t. F.F.f. 3 ; 

 Adams, Gen. Moll. t. 27. f. 5. 



Central tooth of Aporrhais pes-pelecani narrow, above wider, con- 

 vex ; cutting edge wide, with a central spine, denticulated on each 

 side ; first lateral tooth almost transverse, upper margin folded, 



Fig. 43. — Teeth of Aporrhais pes-pelecani. 



ton* 



unarmed ; second and third similar, claw-like, slender, elongated, 

 simple, decussated with the opposite (fig. 43). 



The Aporrhais pes-pelecani creeps slowly ; but the organs do not 

 appear adapted for progressive movement. It is shy, and whether 



