232 TRANSACTIONS OF THE WAGNER FREE 



Of the Other species which have been referred to, this genus from the 

 Neocene of the United States, excluding those previously referred to, F. par- 

 vula Lea, is probably a small Mitra similar to M. wandoensis T. and H. ; 

 while F. Tiiomeyi Holmes may very probably belong to another genus alto- 

 gether. 



Genus GLYPTOSTYLA Dall. 



Shell thick, pyriform, reticulately sculptured, with a narrow produced 

 canal; outer lip expanded and thickened internally; pillar with two strong 

 plaits connected by a grooved callus; body callous, but with no subsutural 

 lamina; nucleus minute, prominent; spire short; suture distinct but not chan- 

 nelled. 



Type G. panamensis Dall. Tertiary of the Isthmus of Darien, near 

 Panama. 



This form is extremely puzzling. It recalls Pyrula and other Tsenio- 

 glossa by its external characters, Turbinella and Mazzalina by its solidity and 

 heavy outer lip, Latu'us and Volutilithes by its plaits. A species which, in all 

 probability, should be referred to this genus is Turbinella crassitesta Gabb 

 (Geol. Surv. Gala. Paleont., vol. ii. p. 157, pi. 26, fig. 36, Dec, 1868), from the 

 Martinez Group of California. The canal in this form is straighter than in 

 the type, but the other features are so similar that I cannot hesitate to in- 

 clude the Californian fossil with that from Panama. 



The Martinez group, being transitional in its character, has been merged 

 in the Chico-Tejon series, which covers the continuous upper Cretaceous and 

 lower Eocene of that section. It is impracticable at present to assign a posi- 

 tive place in the geological scale to the Californian form, except as above 

 indicated. 



The Panama specimens come from the line of the canal in a cut 19 kilo- 

 meters southward from Colon(or Aspinwall, as it is sometimes called), at a few 

 feet above sea-level. The station where the cut was made was known as 

 Vamos-vamos, and the specimens, consisting of several masses of clayey and 

 sandy, rather soft, dark-gray rock, were kindly submitted to me for ex- 

 amination by Prof. Alex. Agassiz. 



With the Glyptostyla were associated numerous specimens of 7?/;'- 

 ritella Gatiinensis Conrad, a species resembling T. arenicola from the upper 

 Eocene of Arkansas, a Cerithiopsis, Neverita (like small diiplicata), Naiica 

 (sub-genus Cochlis, close to maroccand) and a Caduhis ; with these were 

 the following Pelecypods : Area (near transversa), Leda (hardly distinguish- 

 able from L. aaita Conr.), Cytherea, Semele, Mactra (like alata, but small 

 and sub-triangular), Corbida, and Strigilla. This assemblage has not a 

 very ancient appearance and can hardly be older than the Eocene, while con- 

 taining nothing which might not be of Miocene age. 



