88 University of Texas Bulletin 



HORIZON: Top of lower half of the Del Rio clay, equivalent of Gray- 

 son formation (top of zone of Exogyra arietina, in association with 

 Turrilites bosquensis, Acanthoceras worthense, Pecten subalpinus, Gryphea 

 mucronata) . 



TYPE LOCALITY : West bank of the South Bosque River, 150 yards 

 south of the bridge on the Speeglevilte road, tall Del Rio cliff; 5.5 miles 

 west of courthouse at Waco, Texas. 



DESCRIPTION : Form inflated, section of volution rather tall, flanks 

 and venter broadly rounded, keel absent, dorsum concave with a sharper 

 curvature than the venter ; volution covering about one-third of preceding 

 one. Volutions with few widely spaced, very large, smooth, low umbil- 

 ical tubercles each one-third to one-half the height of the volution; from 

 each of these a single low broad rib runs ventrally, reducing in height 

 and disappearing at the ventro-lateral margin. Ventral marginal tubercles 

 absent. Umbilicus wide. Only three volutions visible in the type (in- 

 terior damaged). The form is approximately that of Flickia boesei ex- 

 cept for the presence of ribs and the much more open umbilicus. In the 

 type the crowded sutures end abruptly near the end of the last volution, 

 beyond, which the living chamber has several oblique low ribs each term- 

 inating in a low, indistinct umbilical tubercle. 



SUTURE: In form the suture is rather like that of Flickia or of 

 Neolobites, with a slight angularity in some places. Three lobes and three 

 saddles visible on each side, including the siphonal lobe. Siphonal lobe 



Fig. 10. Flickia (?) bosquensis n. sp., diagrammatic projection of sutures of type 

 individual, camera lucida drawing, x 5. 



subquadrate in outline, with two equal, simple, rounded lobules and a 

 shallow external saddle. First lateral saddle about one and two-thirds 

 times as broad as the siphonal lobe, more angular on its ventral margin, 

 more evenly curved dorsally. First lateral lobe about half as broad as 



