49 



laterali, compressa ; postice attenuata ; areola valde compressa ; 

 natibus parvis ; dentibus anticis decern, posticis duodecim, parvis. 

 Length, .6 inch ; height, .35 inch ; width, .09 inch. Habitat, 

 Casco Bay. 



Pecten tenuicostatus, Migh. P. testa parva, tenui, sub-inequi- 

 valvi ; valva superiore plerumque rubro-fusca, tenuicostata, costis 

 majoribus 25 usque ad 30, totidem rninoribus ; auribus costulalis ; 

 valva inferiore pallide rubro-fusca ; extus et intus laevi. Length, 

 .5 inch ; height, .56 inch ; width, .14 inch. Habitat, Casco Bay. 



Chiton mendicarius, Migh. C. testa elongata, in medio longi- 

 tudinaliter ad latus irregulariter granulata, cinerea, nubeculala ; 

 areis parum conspicuis ; margine coriaceo, rubro. Length, 1 inch ; 

 breadth, .4 inch ; width of margin, .06 inch. Habitat, Casco 

 Bay. 



Cemoria princeps, Migh. C. testa alba, procera, costulata, 

 punctulata ; rima intus in canalem producta, fornice obtecta ; for- 

 nice lateraliter testae alis adjuncto ; apertura ovata, crenulata. 

 Length, .46 inch ; width, .33 inch ; height, .35 inch. Habitat, 

 Coast of Maine. 



Bulla puncto- striata, Migh. B. testa alba, solida, eleganter 

 striata ; striis crebris, inequidistantibus, punctatis ; spira occulta ; 

 apertura magna. Length, .38 inch ; breadth, .24 inch. Habitat, 

 Casco Bay. 



Pliysa fragilis, Migh. P. testa tenuissima, oblique ovata ; 

 spira brevi ; anfractibus quatuor ; apertura subovata, repanda ; 

 labio tumido, lamina obtecto. Length, .55 inch ; greatest breadth, 

 .4 inch. Habitat, Monmouth, Me. 



Limnaza decollata. L. testa ventricosa ; anfractibus duobus vel 

 tribus, ultimo magno ; spira breviuscula, plerumque decollata ; 

 sutura impressa ; apertura maxima, sub-campanulata ; labro por- 

 recto ; columella valde plicata. Length, .6 inch ; breadth, .5 

 inch ; height, .4 inch. Habitat, Unity, Me. 



Margarita varicosa, Migh. M. testa parva, tenui, conica ; 

 anfractibus quatuor, convexis ; longitudinaliter costulatis, transverse 

 striatis ; sutura sub-canaliculata ; umbilico magno, profundo. 

 Height, .25 inch ; diameter of base equal to the height. Habitat, 

 Bay Chaleur. 



Trochus occidentalis, Migh. T. testa pallida, imperforata ; an- 

 fractibus septem, convexis ; carinis pallide fuscis ; infra laevi ; 



