CEPHALOBIUM, BLATTOPHILA, CATANEMA 



271 



inconspicuous, occupying the anterior two-thirds of the tail, thus: 1()1; 111; 1. 

 The members of the posterior four pairs are not located exactly opposite each 

 other, the right hand member 

 each pair being slightly behind the 

 left hand member. Spicula con- 

 spicuous, rather close together; at 

 the widest part about one-eighth 

 wide as the corresponding portion 

 of the body, ending in minute "bi 

 tons." The lateral pores on the 



tail are the final members of the 



xayg/at, alfit taoe segmmr. 



series of lateral organs. 

 Habitat: Intestine of field cricket, Gryllus neglectus Scudd. 



Fig. 54a and b. 



77. 



55. Blattophila sphaerolaima n. sp. 



Cuticle 



marked with plain transverse striae, 3 microns apart on the head and 24 microns 

 apart on the body, where they are much less plainly to be seen, though they cause 

 a slight crenation of contour. No amphids or setae of any sort. The head is 

 somewhat hemispherical, bearing very small lips almost in the form of an annular 

 elevation about the mouth. The pharynx and its apophyses are contained in a 

 small spherical pharyngeal bulb, hence the specific name. When closed, the 

 pharynx is a prismoid cavity one-fourth as deep as the head is wide and about 

 half as wide as deep, and backward from its base spring apophyses, a dorsal one 

 dominating. The mouth can probably be turned partially inside out. The ante- 

 rior three-fourths of the oesophagus is clavate, averaging one-third as wide as 

 the corresponding part of the neck; this anterior part is connected by a narrow 

 and very short tube with an oblate cardiac bulb one-half as wide as the base of 

 the neck. The intestine, which appears to be only one-third as wide as the body, 

 is set off by a broad and very deep constriction. The rectum is one and one-half 

 times as long as the anal body-diameter. The renette plexus is quadruple. 

 The nerve-ring encircles the oesophagus obliquely. The acute, conoid tail tapers 

 rapidly near the anus, where there is a somewhat indistinct constriction. The 

 anterior lip of the anus projects. The vulva is not very prominent. The num- 

 erous elongated ellipsoidal eggs measure 40-48 X 88-104 microns, and may seg- 

 ment before deposition. 



.4 7.7 15- K 82. 



i._ 3. 4.5 / 5.4 ^3.1 Of the papillae on the male two are pre-anal, 



being large submedian ones adjoining the anus and having a truncate-conoid 

 form with a mucro; there are also two post-anal papillae similar to the foregoing 

 but smaller, and removed from the anus a distance equal to one-third of the body 

 diameter. The spicula appear to be represented by a mere rudimentary point, 

 no longer than the larger papillae, conical in form and projecting with the 

 anus when the nema is killed with osmic acid. The single testis is reflexed at a 

 point somewhat farther behind the cardia than the latter is behind the head. 



Habitat: Intestine of Panesthia brevicollis Sauss., the common spiny-legged 

 wild cockroach ; Moss Vale, New South Wales, Australia. 1889. Osmic to water ? 



56. Catanema exile n. sp. '- L 1- ~~ Nr1 -? The mouth opening is 



closed by three or six very minute, slightly refractive structures. About oppo- 

 site the bases of the cephalic setae there are exceedingly minute onchia (?), 

 possibly six, difficult to see in profile; impossible to count because of their 



