CONTENTS. 



On the Mollusca of Harper's Fer- 

 ry, Va 9 



A Sketch of the History of Con- 



chology in the united states.. 13 

 Synopsis of the Rfcent Species of 



gastroch.enid.e 33 



Reference to Authors on Gastro- 



chsenidse 35 



Family Gastroch^nid^: 38 



Subfamily GASTROCHiENiN^: 38 



Gastroch-sena 38, 39 



Chcena 38 



Fistulana 38 



Rocellaria 39 



Spengleria 40 



cucurbitula 40 



Subfamily Bryopin^: 40 



Bryopa 41 



Clavagella 41 



Dacosta 41 



Subfamily Clavagellin^: 41 



Subfamily Penicillinje 41 



Beechites 42 



Aspergillum 42 



Arrosoir 42 



Warnea 43 



Penicillus 43 



Clepsydra 43 



Fcegia 43 



Arytene 43 



Humphreyia 43 



Gastrochsena agglutinans 44 



" grandis 44 



" mumia 44 



Chcena tessellata 44 



Fistulana clava 45 



Rocellaria brevis 45 



" denticulata 46 



" dubia 46 



Gastrocliaina modiolina 46 



" pholadia 46 



Rocellaria bians 47 



Fistulana rupestris 47 



Gastrochaina cuneiformis 47 



Rocellaria bumilis 48 



" byalina 48 



" intersecta 48 



11 laevigata 4S 



" macrocbisma 48 



" ovata 49 



" pupina 49 



" rugulosa 49 



" apertissima 50 



" cucullata 50 



" difficilis 50 



" impressa 50 



" indistincta 50 



" interrupta 51 



" lamellosa 51 



" Philippinensis 51 



" Ruppellii 51 



" spathulata 52 



