56 THE NAUTILUS. 



has no other name at present which is valid. I was not obliged to 

 take the first species of -Septa as a type, knowing it to be a Lotorium, 

 and did not. The species for which I used it had no valid generic 

 name 'and Septa was applicable, and should, I think, be adopted. 



ON SOME NEW LAND MOLLUSCA FEOM MIDDLE AMERICA. 



BY C. F. ANCEY. 



I. Streptoslyla Sumichrasti, n. sp. 



S. Sumichrasti, Crosse & Fischer, in coll. Salle. 



Testa cylindraceo-oblonga, tenuis, nitidissima, obsolete et flexuosa 

 substriatula, Irate fulvo cornea, concolor sed ad apicem obtusulum 

 pallidior. Spira gradata, conoideo-attenuata. Anfractus 6^ convex- 

 iusculi, sutura canaliculata divisi, ultimus elongatus, iatere dextro 

 leviter planulatus. Apertura subauriformis, superne longe attenuata, 

 basi subdilatata ; lamina columellaris tennis, vix callosa, elongata, 

 spiraliter torta, basi antice vix truncata. Peristoma obtusiusculum, 

 flexuosum, medio antice dilatatum, basi recedens. 



Long. 29, diam. 13, alt. 19^ mill. 



Hab. in isthmo Tehuantepec, reipublicre Mexicana (coll. Ancey, 

 Dautzenberg, Jousseaume). 



A fine large species related to the smaller S. lurida, Shutt. and S. 

 Bocourti, Cr. & Fisch., but much more slender than the latter and 

 of a more graceful oblong shape than the former. This is surely dis- 

 tinct from any species I examined in the collection of the late A. 

 Sall4, now in the possession of Mr. Ph. Dautzenberg. 



II. Streptostyla clavulata, n. sp. 



Testa parvula, primo aspectu Ferussaciis ex grege F. procerulne 

 similis, tenuis, nitida, obsolete vix striatula, verisimiliter statu re- 

 centi pallide cornea, sed emortua albido-hyalina, cylindraceo-elon- 

 gata, oblongula. Spira producta, regulariter attenuata, obtusa, 

 apice magno. Anfractus 6^, subplanulati, sutura appressa, parum 

 distincta, infra pellucido marginata divisi ; ultimus cylindraceo- 

 oblongus, basi subattenuatus. Apertura superne angusta, basi dila- 

 tata, lamina columellaris brevis, parum valida, subcallosa, leviter 



