8 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



Dimensions.— Holotjipe (U.S.N.M. No. 371337) measures: Alti- 

 tude 58 mm. ; greatest diameter, 17 mm. 



Type locality. — Tamiami Trail, 42 miles west of Miami, Fla. 



Turritella coohe'i gladeensis is most closely allied to T. c. harvey- 

 ensis Mansfield, an upper Miocene subspecies, differinsr mainly from 

 the latter in having a more strongly developed peripheral spiral. 

 T. hurdenii (Tuomey and Holmes), an upper Miocene species, also is 

 closely allied to gladeensis, but the former also has a less strongly 

 developed peripheral spiral. 



GLTCYMERIS LLOYDSMITHI FLORIDANA, new subspecies 



Plate 3, FiGimES 4, 5 



Description. — Shell small, subovate, slightly inequilateral, and 

 rather strongly inflated. Beak high, narrovp, and protruding. 

 Middle of disk well rounded; slopes subtruncate, anterior more 

 truncate than posterior. Posterior margin more rounded than an- 

 terior; basal margin narrowly rounded. Sculpture of 31 subrounded 

 to nearly flat, moderately wide, closely set ribs, separated by narrow 

 incised spaces. A few ribs behind the posterior shoulder have a low, 

 medial, raised, radial thread. Cardinal area 1.9 mm. wide and 

 sculptured with 5 chevron-shaped ligamental grooves. There are 

 11 arched teeth in each series behind and in front of the beak. The 

 first posterior tooth, situated beneath the beak, is wider than the 

 others and shallowly corrugated. The teeth in the middle of each 

 series are stronger than those at either end. The lower inside margin 

 shows 20 doubled prominences, separated by valleys equal in width 

 to the prominences. 



Dimensions. — Holotype, left valve (U.S.N.M. No. 371339) meas- 

 ures : Length, 18 mm. ; altitude, 19 mm. ; semidiameter, 6 mm. 



Type locality. — Tamiami Trail, 42 miles west of Miami, Fla. 



The shell here described appears to be very closely allied to 

 Glycymeris lloydsmitM Pilsbry and Brown, a species obtained from 

 the Miocene in the neighborhood of Cartagena, Colombia. The 

 cardinal area on G. lloydsmitlii is much narrower than that of 

 G. I. floridana and has a nearly smooth surface. Dr. A. A. Olsson ^ 

 records the occurrence of G. Uoydsmithi at three localities " in the 

 Gatun stage in Costa Rica." I have not seen specimens from these 

 localities, but the illustrations indicate a somewhat more oblique 

 shell than that of flondana. The new subspecies more closely re- 

 sembles G. subovata (Say) in sculpture and G. pectinata (Gmelin) 

 in outline. 



There are only two left valves of the new subspecies at hand, one 

 of which constitutes the holotype. 



» Olsson, A. A., BuU. Amer. Pal., vol. 9, p. 353, pi. 28, figs. 8-10, 1922. 



