238 ORDER BOLBINIA 



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13. Hyalaimus brevicollis n. sp. ^ * *j, 5.1 1.7 " The colorless, 

 naked skin displays irregular markings and a finely crenate contour. The color- 

 less, transparent, conoid neck ends in a truncate head without setae and having 

 very flat lips, if any. Six rather conspicuous, sub-marginal, wart-like papillae 

 occur in a circlet on the front of the head. No amphids are to be seen. The 

 mouth is a mere depression one-sixth as deep as the head is wide; from it faint 

 apophyses, of which the ventral is the longest and most conspicuous, extend back- 

 ward and seem to indicate that the real depth of the pharynx is equal to the 

 length of the distinct pharyngeal bulb, and accordingly the dimensions are so 

 given in the above formula. The somewhat phalangiform oesophagus begins 

 with the bulb just mentioned as filling the head, and which is two-fifths as long 

 as the neck. Behind this bulb there is a broad, shallow constriction, the remain- 

 der of the oesophagus being fusiform and in its widest part two-thirds as wide 

 as the neck. For a short distance the irregular intestine, three-fourths as wide 

 as the body and separated from the oesophagus by a not very deep constriction, 

 appears transparent and almost bulbous. The cardiac cavity is small and the 

 cardia very flat. The large cells composing the intestine are filled with small 

 granules, displaying no very definite arrangement. The narrow, colorless, 

 transparent rectum is thrice as long as the anal body-diameter, and has a dis- 

 tinct lining. The ventral excretory pore is situated as far behind the cardia 

 as the head is in front of it, the duct in the immediate vicinity being very trans- 

 parent and distinct, and having a distinct lining. The granular lateral fields 

 are one-fourth as wide as the body, and from head to tail a finely crenulate, 

 cuticular wing extends along each lateral line. The tail of the female is conical 

 to the pointed terminus. The unusually large, flat, elevated vulva is two- 

 thirds as wide as the body, and from it the vagina extends backward a distance 

 greater than the body-diameter. The two straight uteri in the only specimen 

 seen contained six to eight eggs, each a little longer than the body width, and 

 measuring 56-60 x 132-140 microns. The ovaries extend two-thirds the distance 

 to the cardia and anus respectively and contain ova arranged single file. 



Habitat: Intestine of an earth-worm, Moss Vale, New South Wales, Australia, 

 April, 1894. It is not certain that this nema may not be con-generic with one 

 or more of those mentioned by earlier authors under the generic names Anguil- 

 ula, Nematodum, etc., nemas also found in earth-worms, but insufficiently 

 described; hence the proposal of a new genus for its reception. 



14. Choronema simplex n, sp. L6 2A / 2 -& 2 - 6 1 - 8 ' The thin cuticle is 

 entirely naked. The wing, which begins near the head and ends on the tail, is 

 possibly double in structure. There is no cardia. The rather thick-walled 

 intestine is separated from the oesophagus by an indistinct collum one -half as 

 wide as the base of the neck, and becomes at once about three-fifths as wide 

 as the body. It has a faint lumen and presents few cells in cross-section. Anus 

 subcontinuous; rectum inconspicuous. The cells of the intestine contain scat- 

 tered colorless granules of variable size, the largest of which are one-fifteenth 

 as wide as the body. In the specimen examined the tail was destined at the next 

 molt to become very much shorter, so that the anus would lie at about 90%, 

 and the tail would therefore be about four times as long as the anal body- 

 diameter. Two sublateral papillae existed on the tail nearly opposite each 

 other. 



Habitat: Soil about the roots of plants, Arlington Farm, Virginia, opposite 



