l36 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



Type-material: Cotypes — colonies on two examples of Liogryphaea 

 cymbium Lmk of the Domerien of Simon-la-Vineuse (Vendee). Coll. 

 Inst. G^ol. Poitiers 983. 



Simonizapfes davenporti, new species 



Figure 38 



Diagnosis: Fossil acrothoracicari burrows with elongate-elliptical 

 burrows in associated pelecypod and belemnite shells from Poricy 

 Brook near Middletown, New Jersey. 



Etymology: Named for Lawrence Davenport, who discovered the 

 slits and showed them to me. 



Distribution: Material collected in Gryphaea mutabilis Morton, 

 Exogyra costata Say, and Belemnitella americana. In addition, burrows 

 with sUghtly different shapes were found in the same association in 

 Ostrea falcata Morton, The burrows w^ere ground down for measure- 

 ment purposes, giving the following dimensions in milUmeters, plus 

 and minus one standard deviation, with the number of the sample in 

 parentheses : 



Species Aperture length X aperture width X burrow depth 



Exogyra costata: 1.148±.625 (48) X 0.29±.183 (47) X 0.286±.17 (48) 

 Belemnitella 



americana: 2.16±.70 (7) X 0.650±.27 (7) X 0.957±.268 (7) 



Ostrea falcata: 0.64 ±.37 (7) X 0.2 II ±.096 (7) X 0.683 ±.295 (7) 



The shells were collected in loose mud with no stratification in the 

 bank of Poricy Brook, which flows into the Navasink River, col- 

 lected within one-fourth mile upstream from the bridge of the Middle- 

 tow^n-Lincroft Road, 0.2 mile SW. of Bamm Hollow Road and Oak 

 Hill Road, about 4 miles from Middletown, New Jersey. 



The shells were identified by Dr. Leo Hertlein of the California 

 Academy of Sciences, and are late Cretaceous. 



Type-material : Holotype burrow in Gryphaea mutabilis Mortons, 

 aperture 2.30 X 0.40 mm (USNM 122605) ; paratypes in G. mutabilis 

 with apertures, in millimeters, of 2.70 X 0.60 (SFSC), 2.10 X 0.50 

 (CA), and 1.45 X 0.35 (Brit). 



Holotype burrow aperture illustrated in figure 38a. The relationship 

 of aperture length and width is graphed in figure 38b, and that of the 

 aperture length and burrow depth in figure 38c, with datum points 

 identified to the genera, and hence the species, listed above. 



