157 



from the other Lepidopleuridae. Pilsbry mentions, that the girclle 

 of the Lepidopleuridae has: »minute, gravelly, smooth or striated 

 scales, usually with a marginal fringe of longer scales" (Mao. of 

 Conch. Vol. 14, Pag. 1). As usual he does not say anything 

 about the underside. He further distinguishes the section Des- 

 hayesiella^ which should have a girdle with delicate spines and 

 chafFy scales. Afterwards Dall added the Section Oldroydia; the 

 girdle of Lepidopleurus percrassus Dall, the only representative 

 of this section, has a narrow girdle, covered with very rainute, 

 partly dehiscent, chaffy scales and with occasional slender spi- 

 cules resembling hairs, and on the base with crowded, minute, 

 sandy scales (7 , Pag. 90). Finally I myself have made the 

 Section Pilsbryella for forms like Lepidopleurus setiger Nierstr. 

 with a great number of spicules and with hairs. A complete 

 scheme of the four sections therefore should be as follows: 

 Section Lepidopleurus s. str. 



Girdle with minute, gravelly, smooth or striated scales, 

 usually with ' a marginal fringe of longer scales. To this 

 section belongs the greater part oï the kno w Lepidopleuridae, 

 namely: Lepidopleurus cancellatus Sow., arcticus Sars, alveo- 

 lus Sars, pergranatus Dall, belhiapi Dall, benthus Hadd, fic- 

 liginatus Ad. & Rve, catillus Rve, concinnus Gld, nexus 

 Oarp., rugatus Carp., kerguelensis ^add., pagenstecheriFieSer, 

 asellus Spengl., cajetanus Poli, algesiren^is Carp., medinae 

 Plate, belgicae Pels., inquinatus Rve, similis Smith, roche- 

 bruni Jouss. , giganteus Nierstr. , simplex Nierstr. , rissoi 

 Nierstr., lineatus Nierstr., planus Nierstr., internexus Carp., 

 mesogonus Dall, halistreptus Dall, luridus Dall, farallonis Dall. 

 Section Deshayesiella Carp. 



Shell elongated ; valves curved ; somewhat beaked ; umbo 

 flattened ; sutural plates triangular ; girdle spiculose. Only 

 one Species ; Lepidopleurus curvafus Carp. 

 Section Oldroydia Dall. 



Valves separated by narrow exteusions of the girdle, 

 reaching to the jugum ; jugal areas prominent, sculptured 



