INDEX 



467 



Pisidium medianum, 54, 58, 73, 88, 98, 134, 



135, 137, 138, 144, 145, 162, 187, 262, 



281, 384. 

 Pisidium medianum minutum, 156, 187, 384. 

 Pisidium milium, 134, 187, 384. 

 Pisidium neglectum corpulentum, 98. 

 Pisidium noveboracense, 23, 24, 27, 35, 88, 



91, 98, 102, 140, 157, 159, 162, 187, 338, 



384. 

 Pisidium noveboracense elevata, 98. 

 Pisidium ohioense, 145, 187, 384. 

 Pisidium pauperculum, 27, 32, 82, 88, 98, 



102, 135, 144, 145, 155, 162, 187, 330, 



384. 

 Pisidium peralta, 9S. 

 Pisidium politum, 26, 30, 32, 35, 38, 82, 88, 



98, 102, 187, 385. 

 Pisidium politum decorum, 88, 98, 102, 187, 



385. 

 Pisidium punctatum, 98, 296, 336, 384. 

 Pisidium punctatum simplex, 98. 

 Pisidium roperi, 9S, 135, 187, 384. 

 Pisidium rotundatum, 132, 133, 136, 144, 



145, 155, 162, 187, 384. 

 Pisidium sargenti, 24, 88, 98, 102, 138, 187, 



384. 

 Pisidium scutellatum, 27, 30, 82, 87, 98, 102, 



133, 136-138, 145, 149, 155, 163, 187, 384. 

 Pisidium splendidulum, 23-25, 27, 32, 33, 56, 



58, 82, 88, 89, 91, 98, 102, 137, 138, 140, 



141, 145, 156, 187, 384. 

 Pisidium superius, 55, 90, 98, 187, 384. 

 Pisidium tenuissimum, 54, 73, 98, 156, 163, 



187, 384. 

 Pisidium tenuissimum calcareum, 127, 128, 



187, 384. 

 Pisidium trapezoideum, 137, 187, 384. 

 Pisidium triangulare, 156, 187, 384. 

 Pisidium ultra-montanum, 149, 187, 384. 

 Pisidium variabile, 24, 26, 27, 29, 30, 32-37, 



39, 72, 82, 88, 91, 94, 98, 102, 128, 132^ 



136-138, 141, 145, 150, 155, 156, 170, 187, 



261, 281, 296, 307, 338, 384. 

 Pisidium ventricosum, 135, 136, 155, 156, 



187, 385. 

 Pisidium ventricosum costatum, 136, 187, 



385. 

 Pisidium vesiailare, 128, 135, 162, 187, 385. 

 Pisidium virginicum, 23, 26, 30, 33, 34, 37, 

 55, 58, 82, 85, 88, 90-92, 98, 102, 125, 



137, 143, 149, 157, 160, 187, 296, 324, 338, 



385. 



Pisidium walkeri, 23, 24, 32, 35, 82, 98, 102, 

 136, 144, 187, 295, 285. 



Plagiothecum denticulatum roseanum, 126, 

 184, 377. 



Planorbis, 2, 6, 10, 127, 150, 153, 155, 178, 

 179, 259, 266, 332, 300. 



Planorbis albus, 147, 236, 242, 289, 338. 



Planorbis altissimus, 128, 188, 387. 



Planorbis antrosus, 23-27, 29, 30, 33, 35, 39, 

 54, 56, 58, 59, 72, 73, 81, 87-95, 99, 103, 

 119, 133, 135-141, 145, 147, 148, 150, 155, 

 156, 157, 159, 160, 161, 162-165, 168, 172, 

 179, 188, 225, 236, 237, 242, 255, 259, 

 260, 262, 264, 274, 278, 281, 295, 307, 

 324, 330, 338, 350, 358, 370, 387. 



Planorbis antrosus angistomus, 140, 141, 188, 

 387. 



Planorbis antrosus striatus, 119, 141, 162, 

 188, 262, 281, 387. 



Planorbis annulata, 147. 



Planorbis bicarinatus, 17, 148, 150, 161, 162, 

 163, 172, 179, 188, 225, 226, 237, 255, 

 259, 260, 274. 



Planorbis binneyi, 145, 188, 387. 



Planorbis campanulatus, 23-27, 29, 30, 33, 

 35, 39, 54, 56, 58, 59, 72, 73, 81, 87, 89-91, 



94, 95, 99, 103, 119, 121, 125, 132, 135, 

 136', 138, 140, 144, 146, 155, 156, 157, 

 159, 161, 162, 168, 188, 387. 



Planorbis crista, 155, 188, 387. 



Planorbis crista cristata, 144, 145, 156, 188, 



387. 

 Planorbis deflectus, 27, 29, 30, 33, 35, 39, 



56, 58, 60, 72, 85, 88, 89, 91, 99, 103, 119, 



132, 133, 135, 137, 138, 140, 141, 157, 159, 



162, 168, 188, 262, 324, 387. 

 Planorbis dilatatus, 172, 225, 236, 237, 242, 



274, 287. 

 Planorbis exacuus, 25, 29, 56, 59, 72, 88, 89, 



95, 99, 103, 121, 126, 138, 139, 140, 145, 

 162, 168, 172, 188, 262, 274, 281, 387. 



Planorbis hirsutus, 81, 121, 138-141, 145, 



156, 162, 188, 242, 338, 387. 

 Planorbis lens, 274. 

 Planorbis lentus, 324. 

 Planorbis obtusa, 147. 

 Planorbis paludosa, 147. 

 Planorbis parvus, 4, 17, 24, 25, 27, 29, 30, 



33-35, 38, 46, 54, 56, 58-60, 64, 72, 73, 



