June 14, 1924 
Plant Parasitic Nemas and Related Forms 
1063 
Thus, the belief that some Dorylaimidae feed partly on plants seems well founded; 
however, this is apparently not true for all species. It is doubtful whether the 
Dorylaimus species, so numerous at great depths in fresh-water lakes, live on 
plants; as plants seem to be unavailable there, a carnivorous feeding habit is 
more probable. Many soil-inhabiting species of Dorylaimus and related genera 
also may be carnivorous. 
The following study of the intestinal contents of Dorylaimus regius de Man 
indicates that at least this species seems to be carnivorous. September, 1923, 
six Dorylaimus regius De Man (four females; two males) were submitted by the 
Plant Quarantine Inspection Service for identification. Four, found by R. G. 
Cogswell, of Philadelphia, Pa., were about roots of Amaryllis imported from 
Germany, and two about roots of roses from Norway. A study of these enables 
the writer to add to the knowledge of this rather uncommon species. Measure¬ 
ments, Cobb’s formula: 
12.5 11.0 
, 0. 
6.1 
15. '51'. 99.0 
female q 5 
1.5 1.6 2.1 1.5 6 919 ram ' 
0. 
? 
17.1 -M- 98.6 
male - 
- 5.848 mm. 
0.5 
? 
1.9 2.1 1.6 
Man’s formula: 
Female+1 
Female+2 
Male 
a-40. 5 
47.9 
47.1 
number of preanal male. 
0— 6.18 
6.4 
5.7 
papillae in both cases, +17. 
^-93. 5 
100. 7 
86.0 
plus two anal papillae. 
v— 52. 3% 
51. 3% 
The two Norwegian specimens (females) differed chiefly in the length of the 
tail, which was much shorter and showed measurements as follows: 
Female 1 Female 2 
Total length — 5. 686 mm. Total length 7. 820mm. 
a- 38.0 51.4 
/S— 6. 08 6. 2 
^—133. 8 154.3 
v- 50.5 47.0 
The typical Dorylaimus regius De Man had hitherto been found only by De 
Man (7), Brakenhoff (2), and Marcinowski ( 8 ). Micoletzky (11) considers D, 
superbus de Man to be a small variety. Perhaps also D. eurydoris Ditlevsen 
belongs to D . regius (5), 
The cuticle has at least three layers (PI. 3, F); the surface layer shows a trans¬ 
verse striation similar to the lines of a finger-print (PI. 3, G), and sometimes a 
faint indication of cross fibers, as in many Mermithids. The number of cephalic 
papillae seems greater than hitherto described; the lateral lips have only two 
papillae, but each submedial lip has three (PI. 2, C, D, E, F, and G). The 
papillae of the second circlet are double on the submedial lips. Another organ 
hitherto not mentioned for the present form is the amphid (lateral organ). The 
whole lip region apparently can be protruded or retracted, and the amphids are 
accordingly seen more or less well. In Plate 2, E, the lip region is somewhat 
protruded and the amphid is partly exserted; whereas in Plate 2, C and D the 
whole organ, hidden inside the ridge just behind the lip region is disclosed as 
a broad pouch-like cavity with a great number of bent and curved terminals 
(Endfasern) as in a few other Dorylaimidae studied. The wall of this pouch¬ 
like structure is thicker in the specimen in Plate 2, C and D than in that of E. 
As Plate 2, F shows, the pouch is somewhat divided into an anterior and a pos¬ 
terior part, and at its base enters what the writer regards as the “amphidial” 
nerve with its numerous fibers, surrounded by a large cell of apparently glandular 
character, which can be followed a distance towards the nerve-ring. Plate 2, G 
shows the amphids of the specimens of Plate 2, C and D, in a front view. 
