338 ORDER ANAXONCHIA 



as wide as the body. It contains a single nucleus, which is swung centrally in 

 the protoplasmic network. The renette cell has two spherical ellipsoidal com- 

 panion cells in the rear. The excretory pore lies at the base of the lips, and is 

 connected with the elongated, fusiform ampulla by means of a duct which extends 

 from the base of the lips to nearly opposite the base of the pharynx. Some- 

 times the ampulla is much elongated, and one-fourth as wide as the corresponding 

 portion of the neck, reaching nearly to the nerve-ring. The tail begins to taper 

 from far in front of the anus, and tapers at about the same rate for some little 

 distance behind the anus, then tapers more rapidly for a short distance, and 

 then finally tapers gradually to the terminus. The caudal glands are located 

 in the base of the tail. The vulva is massive and yet does not project much 

 beyond the main ventral contour. It is prominent on account of a depression 

 which surrounds it. From the vulva the large vagina leads inward half way 

 across the body. The tapering, reflexed ovaries reach half way back to the vulva 

 and contain upwards of ten ova arranged single file. The prolate eggs are nearly 

 as long as the body is wide and have been seen in the uterus one at a time. The 

 distance between the wings on the cuticle, near the anus of the male, is about 

 equal to the width of two of the annules. The tapering, yellowish spicula are 

 more strongly arcuate in their proximal halves than elsewhere. At their widest 

 part they are about one-sixth as wide as the corresponding portion of the body. 

 Their proximal ends, when viewed laterally, appear to lie opposite the body- 

 axis. An indistinct refractive line passes from the proximal ends of the spicula 

 to the distal ends, indicating that the spicula may be wider than would be judged 

 by a consideration of only the main portion of their framework. The accessory 

 pieces are one-half as long as the spicula and in the main parallel to them and 

 are arranged in comparatively close contact. Near the anus, however, the frame- 

 work of the accessory pieces bends away from the spicula. Each accessory piece 

 ends in an acute protrusile point, which is rather suddenly and rather markedly 

 bent forward. The spicula present the same arcuate appearances at their tips 

 as do the accessory pieces. Both the ejaculatory duct and vas deferens are about 

 one-third as wide as the corresponding portion of the body. 



Habitat: Larat, East Indies. Marine; apparently very common. Sublimate 

 to balsam. Fig. 116, p. 337. An examination of sloughed cuticle of the head 

 gave equally satisfactory evidence of the existence of joints in the setae. 



117. Actinonema pachydermatum n. sp. Cuticle naked, very thick, occupying 

 one-half the radius as measured at the base of the neck. Annules alike except 



-35 8.6 -it__ _V 1 L_?i'_> 83 . tnat tney grow narrower toward 

 T8~~ir~3Tj 4. 2-5 ' "" the extremities, especially the head 

 .35 9.z _i6. -x 85. end; resolvable with difficulty into 



T.~~i.l~7.7 M^S,*!" * S " rod-like markings, with less diffi- 

 culty on the anterior half of the body. The prominent wings, begin- 

 ning on the neck, end near the middle of the tail. As there are deep, 

 narrow grooves between the annules, the contour of the body is irreg- 

 ularly crenate. Head set off by contraction and a deep constric- 

 tion, subtruncate ; mouth more or less depressed. The lip-region is one-half as high 

 as wide, and appears to be composed of three fairly well developed, rounded, sub- 

 distinct lips, which are set off by constriction. This lip-region appears as if 

 protruding from within the thick cuticle, and stains in carmine while the cuticle 

 remains quite colorless. On the lips there are no obvious signs of a cuticle. The 



