Notes on Dipterocarps. 
No 6. Qn the genus Pachynocarpus. 
By JI. H. Burkitt AND F. W. FoxwortnHy. 
Pachynocarpus is a small genus of the natural order Diptero- 
carpaceae, with its nearest affinity to the somewhat polymorphic 
genus Vatica. If Vatica be divided into two or more genera, then 
Pachynocarpus is abundantly distinct; but if, as several botanists 
think, Vatica in its variety is still rightly considered a single 
genus, then it is a debateable point whether Pachynocarpus should 
be kept apart from it. It was defined in 1860 by Sir Joseph 
Hooker (Trans. Linn. Soc. XXIII., p. 159) upon material col- 
lected by James Motley in Borneo and sent by (Mr. E. 8S. Barber* of 
the Eastern Archipelago Company to Sir Wilham Hooker 
at Kew from Labuan. Vatica had been defined long before,— 
first in 1771 by Linnaeus (Mantissa II, p. 152) upon a specimen 
from Ceylon (mislabelled China) ; then it had been recognized as 
appearing in the Philippine Islands in a second species (Blanco, 
Fl. Filip., ed. 1, 1837, p. 401) and in the islands of Borneo and 
Sumatra in two more species (Blume, Mus. Bot., 1852, p. 31). 
To these have been added other species up to the number of 55, 
s/ 
Figs. 1 and 2, the shells of two fruits of Vatica Wallichii gathered 
from under the same tree in the Tasek Gelugor Forest Reserve, Province 
Wellesley, showing extremes in the development of the calyx (shaded): 
3, a fruit of Vatica ridleyana in vertical section: 4, shell of the fruit of 
Pachynocarpus wmbonatus in vertical section. All reduced to one-half 
and in all the ealyx shaded. The cotyledons are indicated in 3. 
* The Director of the Royal Botanic Gardens, Kew, kindly informs us. 
that Edmund Scott Barber was Resident Director of the Eastern Archi- 
pelago Company at Labuan at the time of the murder of Motley (see 
Jour. Straits Branch, Roy. Asiatic Soc. Ne; 79, 1918, p:. 37) and pur: 
chased at the sale of Motley’s effects, the latter’s herbarium. Under the 
date Noy. 16th, 1859, he wrote to Sir William Hooker at Kew, telling him 
this and that he would forward the herbarium; and explained that Motyey 
when alive had intended to do so. He also offered a collection of mosses. In 
a second letter he stated that Motley’s herbarium consisted of about 400: 
specimens, and advised the sending to Kew of numerous small packets 
of mosses and ‘‘a remnant of Motley’s herbarium not arranged.’’ 
Jour. Straits Branch R. A. Soc., No. 86 1922. 
