I05 MOLI.USCA OF THE GULF OF MEXICO 73 



Terrebonne Parish, No. i at 2250-2450, No. 2 at 1731- 

 1739, No. 3 at 570-700; 1150-1200, 1200-1300, 1330-1375, 

 1400-1440, 1443-2470, 1 500-1525 feet. Pliocene : Caloosa- 

 hatchie. Upper Miocene : Galveston well at 1550-2S71 

 feet (Harris). 

 Note. — Dr. Dall doubts whether this species descends into the 

 Miocene. The Galveston shell may be an ancestral form. 



intapurpurea Conrad, Jour. A. N. S., Phila., i, new ser., p. 209, 

 1849, (as J'emis); Dall, Tr. W. I. S., 3, p. 1293, 1903; 

 Proc. U. S. N. M., 26, p. 374, '03. 

 Chione cribraria Holmes, Post-Pl. Fos. S. C, p. 35, pi. 6, 

 f. 15, i860 ; Hilgard, House of Rep. Ex. Doc, i, pt. 2, p. 

 887, '78; Dall. Bull. 37, U. S. N. M., p. 54, '89, (as 

 Ve?tus); Vanatta, Proc. A. N. S. Phila., 55, p. 757, 1903. 

 Not Venus cribraria Conrad, Pr. A. N. S. Phila., i, p. 

 310, 1843 ; Fos. Med. Tert., p. 67, pi. 38, f. 2, 1845. 

 Veyius pundulaia Conrad, 1843, not of Valenciennes ; V. la- 

 cunata Reeve, 1863. 

 Note. — True Chione cribraria is Upper Miocene, cortifiaria. 

 Lower Miocene, intapurpurea, Pliocene to Recent. These 

 form a phylogenetic series. 

 Distribution. — Hatterasto Honduras, 18-124 fms. Gulf coast. 

 Recent : Ft. Barranca, Crooked Isl., St. Joseph's Bay, 

 Fla. ; Horn Island, Miss. ; Texas. Pleistocene : New Or- 

 leans artesian well of 1856, at 41 & 225 feet ; New Orleans 

 Gymnasium Club well at 1 200 feet ; Lake Borgne borings. 

 New Orleans pumping station No. 7, Knapp's wells, Ter- 

 rebonne Parish, No. 2, 1050-1190, No. 3, 700-780, 790- 

 830, 1040- 1043 feet. Pliocene of Fla. 



(Lirophora) burnsi Dall, Tr. W. I. S., 3, p, 1198, pi. 62, f. 4, 11, 

 1900, (as Venus); Idem, p. 1294, 1906. 

 Distribution. — Miocene of the Chipola marl and Oak Grove 

 sands. West Florida, and of the Bascom No. i well, Mo- 

 bile, Ala., at 1 500-1556 feet, Bascom No. 2 well, ati24i ft. 



(Lirophora) latilirata Conrad, Proc. A. N. S. Phila., i, p. 28, 

 1S41, (as Venus); Fos. Med. Tert., p. 68, pi. 38, f. 3, 



