CLASS PELECYPODA 
49 
Type. P. ephippium Linn. 
Distribution. Tropical Seas, West Indies, India, West America. 
Range in Time. Trias in the United States, Chile, Europe. 
Pedalion chemnitzianum Orbigny, 1845. 
Moll. Cuba, 2:346; Conch. Cab., 7:59, fig. 580. 
Testa oblonga, transversa, depressa, albida, concentrice, lamellosa, 
irregulariter gradato-squamosa; latere pelleali elongato, producto. Long., 
30 mm. (Orbigny.) 
Type. Location of type and type locality unknown to the present 
writer. 
Range. Coronado Islands to Panama and Chile. Also Atlantic. 
Family PFIILOBRYIDTE. 
Genus PHILOBRYA Carpenter, 1872. 
Shell like a minute Pinna, with pointed beaks; upper margin straight, 
with a strong internal ligament, anteriorly at the byssal sinus somewhat 
insinuated, ventrally and posteriorly rounded and gaping; posterior muscu¬ 
lar scar subcentral, indistinct. (Tryon S. S. Conch.) 
Type. Bryophila setosa Carpenter. 
Distribution. Forrester Island, Alaska, to Cape San Lucas, Lower 
California. 
Philobrya setosa Carpenter, 1864. 
Plate 54, figs. 32 to 35. 
Ann. Mag. Nat. Hist. (ser. 3), 13:314; Jour, de Conchol., 45; pi. 1, fig. 1. 
B. testa parva, regulari; cinerea, salmoneo seu chocolateo, intus sub- 
nacreo, exquisite tincta; t. juniore planata, semirotundata, dorsaliter recta, 
sequilaterali, conspicue punctata: t. adolescente subdiaphana: t. adulta 
solidiore; umbonibus rectus, terminalibus, intus alte excavatis; marg. 
dorsali breviore, recto; antico recto; ventrali et postico late rotundatis; 
extus epidermide subspongiosa vestita, radiis setarum subdistantibus, 
marginibus eleganter pectinatis: intus ligamento solido dorsaliter producto ; 
limbo pallii aequaliter prope marginemdecurrente; cicatr. adduct, sub- 
mediana, inconspicua postice hiante; antice propter byssum tenuem sinuata. 
(Carpenter.) 
Shell small, regular; ash-colored, salmon or chocolate. Inside some¬ 
what pearly, with exquisite tints. Young shells flat, half round, straight 
along the back, equilateral, and conspicuously dotted. Nearly full grown 
shells rather transparent; adults rather solid with straight umbos, which 
are terminal deeply hollowed inside. Dorsal margin rather short and 
straight. Front edge straight; ventral and posterior margins widely 
