463 Costa Rica 



Auriculastrum 54 



Aurinia dubia 82 



mutabilis 81 



robusta 81 



Avicula inornata 367 



B 



Balanophylla haleana 27 



Balantium •••43 



Barnea alatoidea.... ..7 



Basilissa alta ■••'57 



costulata 158 



superba ......158 



var. delicatula 158 



var. depressa 158 



Basterotia ? prima j 20 



Bathoxyphus 38 



Belafilifera 68 



Benthodolium 117 



Benthonella fischeri 140 



gaza 140 



nisonis.. 140 



Bittium boiplex 128 



cerithioide 1 28 



galvestonense 129 



gibberulum 128 



nigrum 128 



nugatorium 1 86 



varium 12S 



yucatecanum.. 135 



Bivonia exerta 132 



Blauneria 56 



heteroclita 57 



pellucida 57 



Boreotrophon 99 



Borsonia cocoensis 8 250 



Bothrocorbula viminea 442 



Bowden beds, Jamaica. 199 



Buccinum obesnm 92 



orbingyi 87 



patula 99 



zonalis 94 



Miocene — Olsso?? 291 



Bulimus monile 55 



Bulla 48, 49 



biblicata.. 50 



canaliculata.... 47 



paupercnla 2o6d 



recta.... 206a 



Bullaria abyssicola 51 



amygdala 2o6d 



occidentalis 50 



pauperculia 7... 194, 199, 2c6c 



piuguiscula 5 1 



solida.... 51 



striata ,., 50 



Bursa affinis 114 



crassa 18 190, 195, 200, 306 



Busy con canaliculatum 85 



carica 86 



eliceans 86 



perversum 86 



pyrum 85 



c 



Cadulus arctus 41 



amiantus 40 



carol inensis 40 



elongatus 40 



mayori , 41 



parvus 40 



poculum.. 40 



quadridentatus 40 



transitorius .41 



turgidus 26 



Caecum annulatum 130 



bipartitum 130 



carolinanum 130 



costatum 131 



glabrum 131 



instructum.... 130 



irregulare 130 



nitidum 132 



pulchellum.... 131 



