1064 
Journal of Agricultural Research v 0 i. xxvhi, No. 11 
As described by Brakenhoff (£), papillae more numerous ventrally than dor- 
sally, can be observed along the entire body in the lateral and submedial regions. 
The writer believes them to be rather of nerve character than outlets of glands 
as Brakenhoff suggests (PI. 4, A; PI. 2, C and D; and PI. 3, A, B, C, and 
D). There seems to be a rudimentary excretory pore ventrad from the nerve- 
ring (PI. 4, A), and several glandular cells at the cardia, but apparently all on 
the dorsal side of the oesophagus and intestine. 
Plate C and D show that the specimens from Germany (PI. 3, C) had a 
longer, less blunt tail than those from Norway. In both males and females, 
papillae similar to the body papillae could be seen on the tail end, their position 
differing in each specimen. At the very end of the tail the cuticle showed in 
one specimen (PI. 3, A and B) a tenon-like element of somewhat darker color, 
not quite reaching the terminal surface. Another had the same region radially 
striated (PI. 3, C), the rest of the animals showing none of these structures. 
Therefore, these and similar features, as they occur in other Dorylaimus species, 
are probably of little taxonomic value. 
Since only a single male has so far been found, or possibly two (if Ditlevsen’s 
D. eurydoris belongs to the present species), some information regarding it may 
be added. The spicula are sketched in Plate 3, A and B. There are two guberna- 
cula; what probably are details of their actuating muscles are also figured. Most 
interesting are the papillae of the male, which differ in the two present specimens 
(PI. 3, B and L). In one specimen the series of preanal, contiguous papillae, 
beginning somewhat in front of the spicula was regular and continuous (PL 3, B), 
while in the other specimen the posterior papillae of the series were separated 
from the others by a long interval. The first specimen in all respects resembles 
the male D . eurydoris as described by Ditlevsen (5). Brakenhoff^ male (2) has 
two. .additional papillae and the series of papillae begins directly opposite the 
proximal ends of the spicula. 
ECONOMIC SIGNIFICANCE AND FOOD OF DORYLAIMUS REGIUS 
In estimating the economic significance of soil nemas, a knowledge of their food 
and feeding habits, of which very little is known, is of chief importance. There 
are two ways to determine the food of these nemas, (1) by experimental feeding, 
(2) by a study of the intestinal contents. The first is difficult on account of the 
environment-^the soil; the second, because the sucking way in which most 
forms feed renders the intestinal contents more or less unrecognizable; neverthe¬ 
less, knowledge important to the. study of soil economy can be gained by- careful 
study of the intestinal contents. Such a study of the four specimens of D. regius 
resulted in finding an oligochaete seta (PL 3, J); there is figured at the right of the 
bristle, at the same magnification, the spear of the Dorylaimus , to show that 
the entrance of the bristle through the spear was possible. In another specimen 
the intestine was filled with a gray mass containing many nuclei of such a nature 
that hardly anything other than the gonad of an animal can be considered the 
source of it. Therefore, D. regius undoubtedly ingests animal matter. In an 
earlier paper Steiner (20) called attention to the apparent relationship of the 
Mermithidae to the Dorylaimidae, these latter being postulated as the ancestors 
of the former. The fact that certain Dorylaimidae actually feed on animal 
food is clearly in harmony with this view. 
PARATYLENCHUS NANUS OOBB INFESTING THE ROOTS OF ZINNIA ELEGANS 
Paratylenchus nrmus Cobb (j) is perhaps synonymous with P. bukowiensis 
Micoletzky (11, p. 606). Cobb found his specimens about the roots of grass, 
Devil’s Lake, N. Dak., and at Four Mile Run, Falls Church, Va. Micoletzky 
