276 Bulletin 39 448 



PLATE 9- (12) 



Page 



Fig. !. Melongeaa consors Sowerby, Old Man Sam Creek, height 



118 mm 112 



2. Phos Veatchi, n. sp. , Hill la, Banana River, height 43 mm.. 121 



3. Phos Veatchi, n. sp.. Hill la, Banana River, height 41 mm.. 121 

 4-5. Phos gatunensis Toula, Gatun, height 30 mm 117 



6. Phos beteyensis, n. sp., Rio Bete}', height 26 mm 122 



7. Northia northige Gray, variet}' miocenica, n.var., tip, Banana 



River 124 



8-9. Phos Moorei Guppy, variety costaricensis, n. var., Banana 



River, height 26 mm 118 



10. Phos mexicanus Bose, Water Cay, height 29 mm 117 



I r. Phos mexicanus Bose, Water Cay, height 27.5 mm. 



12. Phos elegans Gupp}-, variety limonensis, n. var.. Port Limon 



length 27 mm 119 



13. Phos elegans Guppy, variety limonensis, n. var.. Port Limon 



length 22.50 mm 



14. .Northia northige Gra}', variety miocenica, n. var.. Banana 



River 124 



15. Phos snbsemicostata Brovv^n and Pilsbry, Saury Creek, height 



32 mm 121 



i&. Phos metuloides Dall, Mt. Hope, height 19.5 mm 122 



17. Phos estrellensis, n. sp., Estrella River, height 19 mm 120 



18. Phos estrellensis, n. sp. , Estrella River, height 16 mm. 



19. Alectrion rnerenda, n. sp. , Old Man Sam Creek, height 7 mm 124 



20. Alectrion ranuncula, n. sp.. Banana River, height 14 mm 123 



21. Alectrion losquemadica Maury, Port Limon, height 11.50 mm 123 



22. Alectrion ranuncula, n. sp.. Banana River, height 14 mm 123 



PLATE 10 (i3) 



Fig. I. Marginella latissima, variety Pilsbryi, n. var., Banana R 96 



2. Marginella latissima, variety Pilisbryi, n, var. , Gatun 



3-4. Clava costaricana, n. sp.. Banana River, height 40 mm 144 



5. Metula Harrisi, variety limonensis, n. var.. Port Limon, 



heigh. 27 mm 116 



6. Metula Harrisi, variety limonensis, n. var., Port Limon, 



height 25 mm 116 



7. Strombina matima, n. sp.. Banana River, height 12 mm 127 



