NATURAL SCIENCES OP PHILADELPHIA. 93 



Melatoma, Anthony, Gray, Zool. Proc, p. 153, 1847. Woodward, Manual, p. 



131, 1851. Reeve, Conch. Icon., Mar., 1860. 

 Apella, Mighels, MSS. 



SYNOPTICAL TABLE OF SPECIES.* 



Fissure direct, narrow, and deep. Fissure oblique, short, and wide. 



1. Shell striate or ridged. 



a. Shell conical, spire lengthened, sharply carinate. 



1. S. Cariniferum, Anthony. 15. S. p ago du m, Lea. 



S. Showalterii, Lea. 16. S. p y r a m i d a t u ra, Shutt. 



2. S. castaneum, Lea. 17. S. W e t u m p k a en s e, Lea. 



S. omata, Anth. 



S. pagoda, Lea, of Reeve. 



b. Shell conic-cylindrical ; spire obtuse, not carinate. 



3. S.oToideum, Shuttleworth. 18. S. A lab am e n s e, Lea. 



19 S. Anth o ny i, Lea. 



4. S. excisum, Lea. 20. S. b a b y 1 o n i c u m, Lea. 



Spillmanii, Lea. 



c. Shell globosely-ovate, spire moderate. 



5. S. pumilum, Lea. 21. S. B u d d i i, Lea. 



Globosum, Lea. S. funiculatum, Lea. 



Alabamense, Lea, of Reeve. S. pagodum, Lea, of Reeve. 



Shoioalterii, Lea, of Reeve. 



2. Shell smooth, 

 d. Shell elliptic. 



6. S. ellipticum, Anthony. 



7. S. 1 aci niat um, Lea. 



e. Shell quadrately cylindrical. 



8. S. a m p lum, Anthony. 22. S. d em iss um, Anth. 



9. S. n u c u 1 u m, Anthony. S. Hartmanii, Lea. 



23. S. co n str ic turn, Lea. 

 S. rectum, Anth. 



10. S. cylindra ceu m, Mighels. 24. S. s alebr osum, Anth. 



S. robuslum, Anth. 



S. rectum, Anth., of Reeve. 



f. Shell ovate, whorls obliquely flattened, spire obtuse. 



11. S. b u lb osum, Anthony. 25. S. glandu lum, Lea. 

 S. ovalis, Anthony. 26. S. i n c i s u m, Lea. 



12. S. curtum, Mighels.f S. virens, Lea. 



S. quadratum, Anthony. 

 S. obliquum, Anthony. 



13. S. g 1 a n s, Lea. 



g. Shell globose. 



14. S. s p h a? r i c u m, Anthony. 



SPECIES. 



S. cariniferum, Anthony. 



*The Schizostomx contain two nearly equal groups, characterized respectively by a narrow 

 direct, and an oblique, short, wide slit. 



In the above table the opposite species in the two groups are generally exactly similar except 

 in the character of the slit ! 



f Synonym of bulbomm t 



1864.] 



