Fig. 4. 

 Campthotheca 



crassa, 



transverse section 



of semara. 



The genus Camptotheca now contains only 2 species, both confined to the mount* 

 ains of Western China and the borderland of Tibet. It has a samara with 1 locule and 

 1 seed ; but it has 2 styles (one of the illustrations in the Pflanzenreich shows 3 styles). 

 We sacrificed the smallest of the three fossil fruits (fig. 4) in order to make 

 serial sections of it. The fruit was difficult to cut, and very friable, so that 

 we could only shave off successive slices, and photograph the surface thus 

 exposed; we were unable to obtain thin slices for preservation. Our pho* 

 tographs show clearly 2 locules, each with 1 seed, and some of the sections 

 show perhaps a third locule in which no seed has been developed. One 

 of these photographs is reproduced in text*figure 4. The fruit, as will be 

 seen from Plate XIV, is a small one, and perhaps not properly developed; 

 sections of the larger fruits might show 3 fertile locules. 



The occurrence of 2, if not 3, locules should remove the fruit from 

 Camptotheca; but the occurrence of 2 (or 3) styles in the living Campto* 

 theca, and the close general resemblance between the fossil and recent 

 fruits, makes it seem better to enlarge the genus rather than to constitute 

 a new one. The nearest ally is Davidia, which however has 6 or more 

 locules, and a very different fruit. 



As the fruits of the recent Camptotheca grow in crowded heads, 

 they vary greatly in size and in the shape of the wing ; our fossils seem 

 to have varied in the same way. The fossils are so hard and strong that 

 they may have drifted a considerable distance without injury, except to the thin edge 

 of the wing. 



OENOTHERACEAE. 



TRAPA NATANS Linn. 

 PI. XIV, figs. 6-12. 



Fruits of Tvapa natans are abundant at Brunssum, but small and very variable. 

 Figs. 6—10 give some idea of the range of the variation, but it is unnecessary to describe 

 the different forms. A few broken specimens occur also at Swalmen and at Reuver. 



Dr. Tesch has recently obtained from Tegelen better specimens of the 2*horned 

 variety there found. Two of these are now figured (figs. 11, 12). 



CIRCAEA CRASSA Sp. nov. 

 PI. XIV, fig. 13. 



Fructus crassus, in pedicellum validum gradatim attenuatus, ut pedicellus 

 valde 4*costatus. 



Fruit thick, gradually merging into the thick pedicel; both fruit and pedicel 

 strongly 4*ribbed. 



Length 5.0 mm., breadth 2.3 mm. Swalmen. 



122 



