APODONTIUM, IRONELLA 



277 



VI. Order Apodontia 



i.'5"\(i.*'* 2-3 "" Striae resolv- 



.7 5. 9.4 



62. Apodontium pacificum n. sp. '.?"/" Y.z""i.'3 



able into dot-like elements. Neck cylindroid posteriorly, convex-conoid ante- 

 riorly. The cylindroid oesophagus ends in an inconspicuous, flattish-conoid 

 cardia one-third as wide as the base of the neck. The thin-walled intestine is 

 set off by a collum two-thirds as wide as the base of the neck, has a somewhat 

 distinct lumen, becomes at once two-thirds as wide as the body, and in cross- 

 ~^.mn(l(6l section presents three to four cells containing granules of 

 , uniform size. From the somewhat elevated anus the prom- 

 " inent rectum extends inward a distance equal to the anal 

 tsubcph body diameter. Tail conoid from the anus. The conspicu- 

 ous, more or less elongated caudal glands are packed in a 

 close tandem behind the anus in the anterior half of the 

 Wt&il. There are about eight ventrally submedian and two 

 dorsally submedian setae on each side of the tail. These 

 stoutish, tapering setae are about one-fourth as long as the 

 X750 anal body diameter. The large granular, ellipsoidal renette 

 cell, two-thirds as long as the body is wide, and two-thirds as wide as long, lies 

 a short distance behind the base of the neck, and empties through an ellipsoidal, 

 thin-walled ampulla. The nerve-ring is accompanied by obscure nerve cells. 

 The yellowish spicula are slender and subacute. Their proximal ends appear 

 to lie somewhat dorsad from the body-axis. There are two separate, strong, 

 rather stout, simple accessory pieces. They are one-half to two-thirds as long 

 as the anal body diameter, and their proximal ends lie near the dorsal body 

 wall. There are no supplementary organs, special setae, or papillae on the tail 

 of the male. The ejaculatory duct is one-third, the vas deferens one-third, and 

 the testis one-half, as wide as the body. The testis tapers and is at last narrow. 

 Habitat: Marine; Mollendo and Salaverry, coast of Peru, S. A. Sublimate to 

 balsam. Fig. 62. 



8.7 1 20. '= 9*. y . ln 



63. Ironella prismatolaima n. sp. /u* i i-9 2. -T-*. 1.1 ' Lateral wings 

 very faint. Body naked. Lips six, very tenuous, revolute, forming a short 

 tube one-fourth as wide as the lip-region. 



There are six obscure, flat, conical, labial 

 papillae, not shown in the illustration. 

 Labial setae minutely "furcated" at the 

 extremity. Each of the three odontia is 

 duplex, the two parts of the submedian 

 ones being of unequal size. The odontia 

 are contained in a somewhat napiform 

 cavity. Odontia acute, with an outward 

 stroke; when at rest somewhat outward- 

 pointing, and blocking the entrance to the 

 pharynx. Posterior part of the napiform 

 cavity apparently lined with exceedingly 

 minute denticles . Neck cylindroid. 

 Amphids faint, apparently consisting of 

 an almost imperceptible transverse groove / j 

 partially encircling the head. The cylin- 

 droid oesophagus is at the nerve-ring four-sevenths, and finally three-fifths, as wide 

 as the corresponding portion of the neck; its lining is prominent, occupying one- 

 third the diameter of the organ. In the coarse, colorless musculature there are 



iP^O^i^r In 

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