15 



Section 5. — Striate Mei.anm:. 



Melania striata. Testa conoidea, subtenui, tenebroso-fusca, striata., plieata, 

 superne carinata; spira subclevata; suturis impressis; anfractibus octonis, 

 convexis; apertura parva, elliptica, intus subrufa. Hub. Tcnn. — Dr. Troon!,. 



Melania pilula. Testa subglobosa, crassa, striata, tenebroso-fusca ; suturis 

 sub-impressis; anfractibus convexis apertura, ovata, magna, infra subangulata, 

 intus purpurata,. Hub. Tcnn. — Dr. Troost. 



Melania circincta. Testa turrita, subtenui, pallido-lutea, fasciata, superni 

 striata; spira exserta; suturis parvis; anfractibus novenis, subconvcxis, in 

 medio carinatis ; apertura subparva, elliptica, ad basim angulata, intus alba. 

 Hab. Tenn.— Dr. Troost. 



Section 6. — Tuberculate Melanije. 



Melania venusta. Testa fusiformi, subtenui, luteola, superne subtubercu- 

 lata; spira subobtusa ; suturis rugoso-impressis ; anfractibus senis, convexis ; 

 apertura producta, ad basim angulata et canaliculata, intus albida. Hab. 

 Tenn.— Dr. Troost. 



Melania Florcntiana. Testa, elliptica, ponderosi, pallida tuberculata ; spira 

 obtusa ; suturis impressis ; anfractibus senis, subconvexis ; apertura producta, 

 albida. Hab. Tennessee River, Florence, Alabama. — Mr. Dvtton. 



Melania Duttoniana. Testa fusiformi, subcrassa, luteola, fasciata, tubercu- 

 lata ; spira elevata, ad apicem acuta ; suturis enormiter linearibus ; anfracti- 

 bus septenis, superne depressis; apertura producta, ad basim angulata, et 

 canaliculata, intus albida. Hab. Waters of Tennessee. — Dr. Troost. Duck 

 River, Maury Co. Tenn. — Mr. Dutton. 



Section 7. — Granulate Melanin. 



Melania Holstonia. Testa conoidea, subcrassa, nigra, granosa; spira sub- 

 elevata; suturis impressis; anfractibus superne planulatis; apertura ovata, 

 purpurea. Hab. Tennessee. — Dr. Troost. Holston River, Tenn. — Mr. S. M. 

 Edgar. 



Section 8. — Cancellate Melanin. 



Melania caliginosa. Testa conoidea, subcrassa, cancellata, transverse striata, 

 tenebroso-fusca; spira elevata; suturis irregulariter impressis; anfractibus oc- 

 tonis, sub-convexis; apertura parva, elliptica, intus purpurata. Hab. Tenn. — 

 Dr. Troost. 



Melania nodulosa. Testa conoidea, crassa, cancellata, tenebroso-fusca; su- 

 turis irregulariter impressis; anfractibus sub-convexis; apertura subgrandi, 

 elliptica, infra subangulata, intus ccerulea. Hab. Tenn. — Dr. Troost. 



Dr. Patterson read a communication, entitled "Psychologi- 

 cal Observations on the Siamese Twins, Cheng and Eng, made 

 in 1836, by Professor George Tucker, of the University of 

 Virginia;" which was referred to a committee. 



Professor Bache presented to the notice of the Society ob- 

 servations of magnetic declination received from Mr. Bond, 

 which had been made by that gentleman during six days, com- 



