470 UNGULINIDJE. 



Species of Cryptodon. 



ferruginosus, Forbes. Sarsii, Loven. 



flexuosus, Mont. tvisinuatus, DVrb 



Gouldii, Phil. 



Genus GAFRARIUM, Bolten. 



Mantle open below, the margin doubly fringed ; siplional 

 orifice single, with a long, retractile, tubular valve. 



Shell transverse, equivalve, ventricose; surface of valves 

 sculptured ; beaks incurved ; urnbonal area with an oblique 

 furrow ; margins of valves denticulated internally. Hinge 

 composed of two primary and two lateral teeth in each 

 valve. Muscular scars round, polished ; pallial line simple. 



Syn. Fimbria, Mii/i/f., not Bohadsch. Idothea, Schum. 

 Corbis, Guv. 



Ex. G. fimbriatum, Linnmis, pi. 1 14, fig. 3, 3, a. 



This genus is composed of few species, with elaborately- 

 sculptured valves. The siphonal orifice of the animal is 

 provided with a long, retractile, tubular valve ; and the 

 mantle-margin is furnished with a double fringe. The 

 Eastern seas afford us examples. 



Species of Gafrarium. 



cselatum, A. Adams. scitulum, A. Adams. 



elegans, Desk. Sowerbii, Reeve. 



fimbriatum, Linn. 



Fam. UNGULINID^E. 



Mouth with four foliaceous, membranous palps. Mantle- 

 margins united, with the exception of a large, inferior pedal 

 opening and a small, sessile anal aperture ; gills two pairs 



