ACERSp. 3. 



PI. XI, fig. 7. 



Seeds of a third species of Acer occur at Reuver and Swalmen. They may belong 

 to A. campestve, but are very small for that species. 



ACER LIMBURGENSIS Sp. nov. 

 PI. XI, fig. 8. 



Samara magna, parum compressa, rotundatotriangularis, alis exclusis 

 8.5 mm. longa, 8.0 mm. lata, nervis conspicuis crasse reticulatis; alae subparalellae, 

 approximatae, tenuiter striatae. 



Fruit large somewhat compressed, roundly triangular, with coarsely reticulate 

 conspicuous nerves ; wings nearly parallel and closely adjacent, finely striate. 



Length without wing 8.5 mm., breadth 8.0 mm. Tegelen. 



We cannot identify this fruit with any living or fossil species. The specimen was 

 obtained by Dr. Tesch after the publication of our descriptions of the Teglian plants. 



HIPPOCASTANACEAE. 



AESCULUS SPINOSISSIMA Sp. nov. 

 PI. XI, figs. 9—13, 16. 



CAPSULA SPINOSISSIMA ; SPINAE ROBUSTAE, AD BASES VALDE CANALICULATAS CON* 

 FLUENTES. 



Capsule densely spiny; spines robust confluent at their strongly channelled 

 bases ; seeds about the size of AE. Hippocastanum, but only fragments are preserved ; 

 testa more finely sculptured than AE. Hippocastanum, but similar in pattern. 



Valve of capsule, length 30 mm., breadth 18 mm. Swalmen, Reuver. 



This species is abundant at Swalmen, more rare at Reuver. Though no complete 

 ripe capsule has been found, fragments are so abundant that it is easy to compare them 

 with the living species. The fruits (fig. 9) and seeds greatly resemble those of AE. 

 Hippocastanum, (fig. 14), and may belong to an ancestral form of that species; but the 

 differences are so great that it is impossible to consider them as varieties of the same 

 species. Our fossil is not closely allied to any other living form. Sterile fruits (figs. 

 10—13) are elongate ovate or globose, densely spiny all over, showing no smooth 

 areas ; their length is about 9 mm. Ripe fruits show occasionally less spiny patches ; 

 but are always more spiny than in AE. Hippocastanum, of which a weathered specimen, 

 which shows best these spines, has been figured (fig. 14). The wild form of AE. 

 Hippocastanum, from Greece, has fruits scarcely distinguishable from the cultivated form. 

 The sculpture of the testa is somewhat finer in the fossil; it is shown in figs. 15, 16, 

 which are taken from about the same part of a recent and a fossil specimen. This sculp* 

 ture varies somewhat according to its distance from the hilum. 



Ill 



