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M. microphyllus, 

 capucinus, 

 asperrimus, 

 phyllopterus, 

 acanthopterus, 

 tripterus, 

 trigonularis, 

 uncinarius, 

 hemitripterus, 

 gibbosus, 

 triqueter, 

 trigonulus, 

 brassica, 

 saxatilis, 



M. endivia, 

 radix, 



melanomathos, 

 hexagonus, 

 scorpio, 

 secundus, 

 quadrifrons, 

 turbinatus, 

 trunculus, 

 anguliferus, 

 melonulus, 

 Magellanicus, 

 lamellosus, 

 erinaceous, 



Triton. Shell oval or oblong, cl 

 ternate, or rare, or nearly solitary, 

 aperture oblong. An operculum. 



T. varie^atum, 

 nodiferum, 

 australe, 

 lampas, 

 scrobiculator, 

 Splengleri, 

 corrugatum, 

 succinctum, 



M. tarentinus, 

 scaber, 

 costularis, 

 polygonulus, 

 vitulinus, 

 annularis, 

 crispatus, 

 fenestratus, 

 cingulatus, 

 cinguliferus, 

 subcarinatus, 

 torosus, 

 lyratus, 



T. pileare, 



' iot.orium, 



' femorale, 



' pyriun, 



' cynocephalum, 



' triptis, 



' canal if erum, 



' retusum, 



lannelled at the base; 

 and never forming a 



T. clavator, 



' tuberosum, 



' vespaceum, 



' chlorostomum, 



' anus, 



1 clathratum, 



' subdistortum, 



' cancellatum, 



M. concatenatus, 



' granarius, 



' fimbriatus, 



' pulchellus, 



' aciculatus, 



' regius, 



' cristata, 



' ferrugo, 



' funiculus, 



' lubiosus, 



' pinnatus, 



' pictus, 

 2 fossil species. 



varices either al- 

 longitudinal row; 



T. maculosum, 



' clandestinum, 



' rubecula, 



' cutaceum, 



' dolarium, 



' tranquebaricum, 



' undosum. 



ALATA.— Three Genera. 



Shell with a more or less elongated canal at the base of the aperture, the 

 right lip of which changes its form with age, and has a sinus at the lower part. 



Rostellaria. Shell fusiform or subturreted, terminated by a beak- 

 shaped canal; right lip entire or toothed, more or less dilated with age; with 

 a sinus contiguous to the canal. 



R. curvirostris, 

 ' rectirostris, 



R. pespilicani, 



R. cancellata, 



3 fossil species. 



Pterocera. Shell ovate oblong, ventricose, terminated at the lower part 

 by an elongated canal; the right lip dilated by age into a digitated wing, with 

 a sinus towards the base. Spire short. 



P. chiracrra. 



P. truncata, 

 ' lambio, 



P. millepeda, 

 ' pseudoscorpio, 



P. scorpio, 

 ' aurantia, 



Strombus. Shell ventricose, terminated at the base by a short, notched, 

 or truncated canal; right lip dilated by age into a simple wing, lobed or ere- 



