170 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1921. 



lect«d in the Dakota sandstone of southern 

 Kansas and subsequently recorded by Bartsch 

 from the same formation in Iowa, is repre- 

 sented in the lower beds of the Tuscaloosa 

 formation of western Ahibama and in the 

 Woodbine sand at Arthurs Bluff, Tex., by 

 leaves which are identical in all their characters 

 with the t\'pe material and which seem to be 

 closely allied to the Tertiary and modern forms 

 of Rhammis. It has been reported by Engel- 

 hardt from the Cenomanian of Niederschoena, 

 Saxony, but this record may well be considered 

 doubtful. 



Genus ZIZYPHTJS Adanson. 



Zizyphus lamarensis Berry. 



Plate XXXVI, figure 4. 



Zizyphus lamarensis Bern.', Torrey Hot. Cluh IhiU.. vol. 

 39, p. .398, pi. 31, fig. 1, 1912; U. S. (ieol. Survey 

 Prof. Paper 112. p. 112, 1919. 



Leaves elliptical, 4.5 to 5 centimeters in 

 length by .3 centimeters in maxinnini width, 

 about midway between the apex and the l)ase, 

 though slightly nearer the base ; base full and 

 rounded; lateral margins full and rounded; apex 

 rounded, slightly less full than the base; mar- 

 gin with regular but shallow crenate teeth, 

 becoming less prominent toward the base. 

 Midrib slender but prominent, straight. Lat- 

 eral primaries one on each side, diverging 

 from the midrib at its extreme base at an acute 

 angle (about 10°), thin, slightly curved inward 

 above the middle, joining a secondary in the 

 apical part of the leaf. Secondaries from 

 the midrib two or three alternate thin pairs 

 in the apical region, camptodrome; seconda- 

 ries from the lateral [)rimaries five or six in 

 number, on the outside, curved, camptodrome; 

 the lowest secondary is longest and branches 

 at the most acute angle (about 10°) and from 

 the extreme base; each successively higiier 

 secondary subtending a slightly larger angle 

 and following a somewhat shorter course. 

 Internal tertiaries more or less percurrent, 

 marginal ones similar to the secondaries from 

 the primaries in tlicir arrangement and course, 

 thin and camptodrome. 



This handsome species of an undoubted 

 Zizyphufi wius descrilx'd recently from very 

 scant}' material obtained in the Woodbine 

 sand of Texas. It is entirely distinct from 

 any previouslv described Cri'laceous species 

 and is much closer to some of the Tertiary 

 and still existing forms. 



Zizyphus has not yet been discovered in the 

 European Cretaceous, but it is represented in 

 the Western Hemisphere by four or five well- 

 marked types. The nearest to the present 

 species is Z. groenlandiats Heer,'° which oc- 

 curs in the Magothy formation on Marthas 

 \'ineyard and in the Patoot beds of western 

 Greeidand. It is of about the same size but 

 relatively wider than the Texas form anil has a 

 somewhat difl'erent venation and much coarser 

 teeth. The species from the Magothy of New 

 Jersey, Z. cUffwoodensui Berry,'"' is a larger, 

 lanceolate, entire-margined form. The two 

 species from the Oetaceous of Long Island, Z. 

 eleyans ■" and Z. obloiu/iis,'' <lescril)e(l by Hol- 

 lick, are much smaller, entire-margined forms, 

 and Ilollick's Z. leu^mana.^^ another Creta- 

 ceous species from the same locaUty, is a small 

 lanceolate leaf of doubtful afluuty. 



The existing species of Zi:yphii.i number 

 about 40 and arc largely indigenous in the Indo- 

 Malayan region, although the genus is repre- 

 sented Ln subtropical or tropical America, 

 Africa, and Australia. One modern species, 

 Zizyphus vulgaris Lamarck, an oriental form, 

 has foliage almost identical with Z. lamarensis, 

 the outline, margin, and venation being the 

 same. 



Family VITACEAE. 



Genus CISSITES Heer. 



Cissites formosus Heer. 



Plate XL. figure 5. 



CHssiles fomiosus Heer, Flora fosailis arctica, vol. fi, pt. 2, 



p. 85, pi. 21, figs. 5-8, 1882. 

 Lesquercux, The llora of the Dakota group, p. Hil, 



pi. 21, (ig. 5, 1892. 

 ?IIollick, Torrey Hot. Cluh Hull., v.l. 21. p. .",7. pi. 



174, fig. (), 18!M; Thi' Crotaoi'du.s Ihira of southern 



New York and N'l-w Kn^land. p. !ll. pi. :?T. lig. 7, 



1900. 

 Newberry, The Mora of the .\ml)oy clajx, p. 107, 



pi. 47, figs. 1-8, 1890. 

 Herry. New .lersey fiool. Survey Hull. 3, p. 185, 1911; 



I". S. (ieol. Survey Prof. Paper 112. p. 115, 1919. 



I leer's (lesciipl ion. |)iil>lislii'(l m I.S,S2, is as 

 follows: 



('. foliiH pulniulitt. profuDile trilohatia, lubu mu>li'> l'iu<i 

 coutraeto, Irilobalo, IoIiih obtusis. 



" Hocr, Ostrnld, Florofrnfilllii nrrllcn, vol,7.|i.42.pl.n2,nit.20. ISS3. 



•» Berry, E. W., Johns Bn|ikliin Uiilv.Clrc., now jcr.. No. 7, p. *i, nn. J, 

 1907. 



" Hnllirk, Arthur, Torroy Hot. Chili. Biill., vol.21, pi. 17(1, (iR.fl. ISW. 



n llnilli'k, Arthur, Tho ('rolwonii.i llnrn of Honlhorii Now York and 

 Now EnKliinil: U.S. Ocol. Survey Mnu. .V), p. IH, pi. M. Rgf. ». in, 1007. 



M lloUIrk, Arlhur, Torroy llni. Clul) Hull. vol. 21, p. .'>s. pi. isii, 

 Og. 13, IHIM. 



