GENERA AND SPECIES. 



135 



Pleurobranchus. (PLEUROBRANCHID^E.) Plate xxx. 



580. membranaceus, 2 in. shell ear-shaped, membranous, outer margin 



dilated. 



581. plumula, . f in. shell oblong, corneous, outer margin 



straight. 



Pleurophyllidia. (PLEUROPHYLLIDIID&.) Plate xxxii. 



Go i. loveni, i in. brown, with thin white stripes and black 



specks, gills and tentacles yellowish. 



Pleurotoma. (CONIDJE.) Plate xxix. 



Whorls rounded 



549. trevelyana, % in. white, spire turreted. 



543. lavigata, 



in. yellow, with chocolate margins, spire not 

 turreted. 



Whorls angulated 

 Spire turreted 



539- xugulosa, J in. yellowish, with or without brown bands, 



whorls 7, canal truncated, outer lip with- 

 out ledge. 



541. galenta, in. grey, conical and rather stout, whorls 7. 



547. rufa, ^ in. purplish brown, whorls 7. 



548. ttirricula, J in. white, whorls 7 or 8. 



540. brachystoma, -$ in. yellowish white or reddish brown, whorls 8 

 or g, labial notch on the ledge at the top of 

 the body whorl. 



536. stnolata, f in. buff, with or without brown bands, 



whorls 9. 



542. nebula, in. chocolate, whorls 10 or n. 



Spire not turreted 



537. attenuata, $ in. 



538. costata, in. 

 544. nivalis, J in. 



Jin. 



545. carinata, 



546. septangularis, 



dark yellow with brown lines, whorls 9 

 or 10, canal straight. 



yellow and brown, whorls 9 or 10, canal 

 curved. 



white, whorls 10, labial notch below the 

 junction of the outer lip with the periphery. 



white, whorls 9, keeled, labial notch half 

 way along the space above the keel. 



reddish brown, whorls 8 or g, coarsely 

 ribbed. 



There are several varieties, none sufficiently distinctive except perhaps cranchii of 547, 

 which has twisted ribs. 



