OP C0NCH0L0GY. 55 



tan), South America (including the whole of New Grenada), 

 and the West Indies. In using the term origin, applied to 

 Families, Subfamilies and Genera, I refer to the country in 

 which there is the maximum specific representation. 



PNEUMONOPOMA. 



Subordo. I.— OPISOPHTHALMA. 



Fam. I.— ACICULACEA. 



Origin. — West Indies; 4 genera, 67 species. 



Total Species. N. Am. 



Geomelania, 21 — 



Chittya, 1 — 



Tkuncatella, 39 5 



Fam. II.— DIPPLOMATINACEA. 



Origin. — Asia and Oceanica ; 8 genera, 23 species ; no re- 

 presentation in America or West Indies. 



Subordo. II.— ECTOPHTHALMA. 

 Fam. I.— CYCLOSTOMACEA. 



Subfam. — Cyclotea* 



* I alter the order in which the names of Subfamilies are given by 

 Pfeiffer, for the purpose of bringing together those of similar origin. 



Origin. — Asia; 7 genera, 190 species. 



Total Species. IT. Am. Mex. C. Am. S.Am. W. I., especially. 

 Cyclotus, 111 — 2 4 16 40 Jamaica. 



Subfam. — Cyclophorea. 



Origin. — Asia and Oceanica; 5 genera, 228 species. Cras- 

 pedopoma (5 species) belongs to the Azores and Canaries. 



Total Species. N. Am. Mex. C. Am. S. Am. W. I., especially. 



Cyclophorus. 163 — 3 3 8 6 Martinique ami 



Subfam. — Pujiinea. 

 Origin. — Asia; 9 genera, 89 species- 



Guadeloupe. 



Total Species. N.Am. Mex. C.Am. S.Am. W. I., especially. 



Megalomastoma, 27 — — 2 1 17 Cuba. 



Subfam. — Realiea. 

 Origin. — Asia (Oceanica), 5 genera, 75 species. 



Total Species. N.Am. Mex. C.Am. S.Am. W. I., especially. 



Hydrocena, 27 — — — 1 — 



bourciera, 2 2 



