DIAGNOSES OF VARIOUS ONCHOLAIMS 425 



ONCHOLAIMIUM, n. gen. 



Monodelphic Oncholaiminae with demanian system, whose males have a 

 versatile, preanal, ventral appendicule. See Figs. 2 and 3. 



Oncholaimium appendiculatum, .*.-?. -.9 *?. ff'.T*-; 



n. sp. Oncholaimium with appar- *.... . j. W. i2M_ oo!r 



ently deteriorated moniliform *** ' ** '- 1 '" " THr"""",^ "iS**^** 

 glands without exit pores, and with very simple ampulliform uvette. Appen- 

 dicule "hinged" and mobile. Figs. 2, 3, 8, 9. Moniliform glands 24-fold, 

 (8 + 16). Exceptionally 32-fold. 



Oncholaimus nigrocephalatus ft. .J.4 to*. ***as. or. 



, . . , ao / 1.6 "1.9 22 an """ 



n. sp. Oncholaimus with very 1? ^ ia iaM_ 00.2 



slightly compound, non-refrac- '** ' *** ** *- 5 i-'i. >3 - 4im " 



tive uvette, pigmented head, and hemispheroid, immobile, preanal, ventral 

 male supplement; demanian system with two rather inconspicuous exit pores, 

 eachlaterad; cells of the rouleaux (moniliform glands) oblique, little flattened. 



Oncholaimus serpens, n.sp. On- f*-T. ?*. .: ."!?*-. ^^>43 mm 



cholaimus whose moniliform o!z T! 12. .***_ pro 



glands are vaguely seriated but not a6 ' *' *' "^ * 



in rouleaux. Compound uvette not condensed and refractive. 



Metoncholaimus pristiurus (z. ?. *?* !*: 



Str.). Specimens from Woods o'.a w 11. 

 Hole gave the opposite measure- 0-a ' ** w 

 ments. Moniliform glands 64-fold. 



t i j 7 . . 1.1 T.T IT. *33.* OS 3 



Adoncholaimus pamcus, n. sp. jia/""."a a.j a.i" i'.g^ 4 - 1 """ 



Adoncholaimus having a transverse row of seven demanian exit pores on each 

 side. See Fig. 7. 



Adoncholaimus fuscus (Bast.). Moniliform glands 8- or 16-fold, see Fig. 1 . 



One soon appreciates the weight of zur Strassen's words where he says, 

 in speaking of the demanian system of various oncholaims, "In fact, the 

 differences are such that, were they equally pronounced in any other system 

 of organs, they would lead to the proposal of separate genera, or even families." 



In this connection the present studies lead to the belief that the demanian 

 system not only varies markedly in the different groups of oncholaims, but 

 that in all probability the system is present but has been wholly overlooked in 

 many of the forms described. Hence it seems premature to attempt a com- 

 plete subdivision of the oncholaims into genera and subgenera. It may be 

 doubtful whether the genera and subgenera so far proposed are natural ones. 

 In particular, Oncholaimus, the group connected with the type species 

 atte?iuatus, seems chaotic; yet no better course appears, at present, than to 

 leave serpens and nigrocephalatus in this ill defined group: 



