CONCHOLOGICAl -WRITINGS. 93 



1. Siphalomphix, Raf. N. G. shell conical, openifig oval acute, 

 end rounded, columella twisted with a tubular ombilic. It differs 

 from Agathina by the columella and ombilic. 



S. honariensis Raf. or Ag. bonariensis, Raf. Six spires tip 

 nearly obtuse, first spire with a transversal angle — shell about one 

 inch long, whitish semi-transparent, brittle. 



2. Stegflmphix, Raf N. G. shell oval opening nearly round lips 

 not quite joined, the internal covering a small spiral ombilic. — There- 

 fore different from Gyclostoma and Paludina. 



St. elegans, Raf. {or Gyclostoma) oval with 5 spires^ white, end 

 nearly obtuse yellow, spires ^ith many small prominent transversal 

 strias. — One inch long or less very pretty. 



3. Diplicaria. Shell oval, opening oval, columella broadly 

 plaited with 2 folds or thick oblique ribs. — Near Valuta and Torti- 

 cella, but not marine. 



B. bonariensis, Raf Oval 'obtuse smooth olive color with 2 

 spires only — small shell of half inch. 



On Jive New Fresh Water Shells, of Bengal and Assam in 

 I Asia. 



They have been collected by Dr. Burroughs and are in^ my 

 cabinet. 



1. Flanorbis albescens, Raf. nearly smooth whitish flattened on 

 the right side with 3 raised spires, only 2 on the left in a hollow, 

 opening hardly oblique. Size above half an inch. 



2. Paludina v'ltula, Raf. oval conical acute, 5 spires, swelled 

 before, olivaceous with narrow spiral brown bands. — Size about one 

 inch long. 



3. Paludina fragilis, Raf. oval swelled ' acute, 5 spires, smooth 

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brittle; of a uniform dark or pale horny color. — ^^Smaller than the 



last. 



4. Melania tessula, Raf. oblong, brown, seven spires, somewhat 

 tesselated by prominent ribs and small spiral' strias, about one inch 

 long, I have 3 varieties. 1. first spire with duplicate strias — 2. do. 

 single strias, knobby tesselate shorter. 3. do. strias nearly obliterated. 

 Are they different Sp ? 



5. Melania costula, Raf. elongate, olivaceous brown, t ov 8 

 spires, all with regular angular ribs lengthway, the first spire with 

 a spiral angle ending at end of opening. Over 1 inch, from the 

 river Ganges. 



