RIIODEA. 253 



XXIV. Rhodea 11. & A. Adams. 



Tcsta impcrforata, dextrbrsa aut sinistrorsa, cylindracea, 

 gracilis, multispira; ahfractus ultimus acutc carinatus, subtus 

 excavatus; apertura Irigona vel subtetragona; columella incras- 

 sata, acute callosa, recte descendens, basi sublruncata; peristoma 

 simplex, subacutum. 



Rhodea (subgenus Columnae) //. §^ A. Adams Gen. rec. moU. 

 p. 135. 



— — — Binn. Sf Bland Norlh-Amer. landsli. 



p. 90. 



— (genus) Mousson in Malak. Bl. XXI. 4 873. p. 16. 



— (eenus Pupaceorum) Pdtel Catal. 1873. p. 15. 102. 



— Pfr. Novit. conch. IV. p. 119. 



— Dohrn in Jahrb. malak. Ges. II. 1875. p. 308. 



— Crosse in Journ. Conch. XXIV. 1876. p. 5.*) 

 Subgenus pro Achatina? californica Pfr. propositum cogni- 



tione specierum plurium exacte typicarum generice nunc bene 

 stabilitum videtur^ Stenogyrae pptius quam Columnae alfinitate 

 naturali conjunctum. 



Species : 



1. Rh. gigantca Mousson. 



«T. imperforata, turrito-cylindracea, bacilliformis, oblique 

 confertim et aeque plicato-striata, nitore destitula, epidermide 

 fugaci corneogrisea vestita. Spira multigyrata, lente attenuata; 

 summo obtusulo, nucleolo hyalino denudato; sutura lineari. 

 Anfr. 14, lentissime accrescentes, primi nitidi convexiusculi, 

 sutura impressa discreti; sequentes plani, sutura lineari vel 

 filomarginata separati; ultimus concave contractus, carina dor- 



*) )>T. pone columellam imperforata, sed ante, in loco axis longitu- 

 dinaiis, profunde umbiiicata, cyiindraceo-turrita, parum crassa, subtrans- 

 lucida, oblique striata, sub epidermide tenui, plus minusve decidua, 

 corneo-lutescente, albida; spira elongata, polygyrata, apice rotundafo, ob- 

 tusulo; sutura in anfractibus supcris linearis, in soquentibus magis ac 

 magis impressa, mox funiculiformis; anfractus numerosi, primi convexius- 

 culi, sequentes planati, ultimus spira multo minor, carina valida, pro- 

 minula circumdatus, infra carinam excavatus; apertura subobliqua, trian- 

 gularis; peristoma (in adultis speciminibus) continuum, marginibus junctis, 

 parietali appresso, columellari arcuato, dilatato, basin attingente, trunca- 

 turam simulante,cum basali angulum formante, supra valide torto, spiraliter 

 circumvoluto, basali subhorizontali, altcrum angulum cum cxterno for- 

 mante. » (Cr. ) 



