26 ANTARCTIC MARINE 



/ 



fusiform, one-half as long as the body is wide, and one-half as wide as long. Both 

 of the males examined had a ventral swelling near the center of the tail, as long as 

 the corresponding body diameter. 



Habitat ; remarks. Bay, Cape Royds. The two females and two males studied 

 were in good condition. 



EUCHROMADORA, De Man, 1886 



The following are characters common to all the species of Euchromadora here 

 described. 



The neck is more or less cylindroid in the posterior part, but usually slightly 

 conoid anteriorly. The tail tapers from in front of the anus, and has no terminal 

 swelling. Cervical setae none or small and scattered, except in E. septentrionalis, 

 somatic setae none or very inconspicuous. Caudal setae none or inconspicuous, 

 except in E. denticulata. Each of the six lips is double, so that there appear to 

 be twelve more or less alike. These are usually distinct when the mouth is open, 

 but so folded together when the mouth is closed as to become less distinct, and to 

 impart to the then narrow vestibule a longitudinally striated appearance. Labial 

 papillae twelve, in a single circlet, forming the apices of the lobes of the lips. The 

 pharyngeal region of the oesophagus is swollen, so as to form a faint pharyngeal 

 "bulb," rather obscurely pyriform or elongated in form. The oesophagus is cylin- 

 droid in the anterior half, and conoid or perhaps clavate in the posterior part, 

 but is without a true cardiac bulb except in E. septentrionalis. Oesophageal 

 lining distinct, often increased posteriorly. There is no distinct cardia. The 

 rather thin walled intestine becomes almost at once three-fifths to three- 

 fourths as wide as the body and is from six to nine cells in girth. It is separated 

 from the oesophagus by a distinct collum one-fifth to one-third as wide as the 

 corresponding part of the body. The chitinous rectum, as long as the anal body 

 diameter, leads inward and forward from the more or less elevated anus. The 

 caudal glands are found in the anterior fourth of the tail (and in E. meridiana also 

 a short distance in front of anus), and empty through ducts devoid of ampullae, 

 except in the case of E. denticulata. The lateral fields are about one-third as wide 

 as the body. The elongated, granular renette cell, one to two body-widths behind 

 the neck, has one or two smaller companion cells in its rear. The medium sized 

 nerve-ring surrounds the oesophagus rather squarely. From the somewhat ele- 

 vated but rather inconspicuous vulva the vagina leads inward at right angles to 

 the ventral surface about halfway across the body. The reflexed, tapering ovaries 

 reach half to two-thirds the way back to the vulva, and contain a dozen or more de- 

 veloping ova, arranged more or less irregularly, especially toward the blind end. 

 The more or less slender spicula are sub-acute, and accompanied by arcuate 

 parallel accessory pieces half as long as themselves. The single testis is cylindroid 

 and about half as wide as the body. 



19. Euchromadora septentrionalis, n. sp. The 600 striae, very difficult to see 

 except at the extremities, are resolvable into minute elongated elements, which 



are interrupted by very narrow 

 and inconspicuous lateral 

 3.2 2.3 ' wings, beginning near the head 



55 and ceasing near the end of the 



1. 6 10.4_,_16.6 -M 88. 



, y 2 y. y y s - 3 y .. tail. Two sub-cephalic setae, 

 nearly as long as the cephalic 



