POLYSIGMA, ALAIMONEMA 



327 



way across the body. The eggs are probably about three times as long as the 

 body is wide. The broad, tapering ovaries, which contain about ten ova arranged 



mostly in single file, but 

 irregularly near the blind 

 end, reach about half 

 way back to the vulva. m w 

 The tail of the male is 

 conoid to the spinneret, Off <M 

 which is nearly one-third 

 as wide as the base of the 

 tail itself. The slightly 

 yellowish, rather strong, 



mph 



subslender, rather acute 



X750 



cmm 



nn(3) 



spicula appear to have their slightly expanded proximal extremities nearly oppo- 

 site the body-axis. There are seventy-six yellowish, refractive supplementary 

 organs in two subventral rows of thirty-eight each. They are subequidistant, 

 but somewhat wider apart anteriorly. They appear to be more or less protrusile. 

 Ejaculatory duct one-third to two-fifths, the testis one-half, as wide as the 

 body. The testis is cylindroid, but tapers near its blind end. 



Habitat: Marine mud, twenty-five fathoms deep, Woods Hole, Mass., U. S. A. 

 Fig. 106a, p. 326; Fig. 1066. 



.5. _2.7 s 5.7 "-H 95. j 21- . 



107. Alaimonema multicinctum n. sp. i'.^ i.5" ! "iVi" i.'i'^'i.'.* '"" Striae over 



1500 to the millimeter, resolvable with difficulty into very exceedingly fine dot- 

 like elements. Cephalic and subcephalic setae sixteen, in four sets of four. 

 Cervical setae scattered, the first four to eight larger than the cephalic setae, the 

 others smaller. Somatic setae scattered, inconspicuous, about one-sixth as long 

 as the body is wide. In two series on the borders of the lateral fields, every 

 amph t set sibcph twenty to thirty annules throughout the nema, 

 there are round, pore-like markings, twice as wide 

 as the annules. The two rows of pores opposite 

 ^ ne l a t era l ne lds are removed from each other by 

 a Distance about equal to three-fifths the body- 

 diameter. There are no lips. The simple, more or 

 j egg triquetrous pharynx is so small as to be very 

 easily overlooked. The three very small onchia are more or less equal in size. 

 Their forward-pointing, acute apices are about opposite the anterior borders of 

 the amphids. The oesophagus is at first three-fifths, near the nerve-ring and in 

 front of the cardiac bulb two-sevenths, and finally three-fourths, as wide as the 

 corresponding portion of the neck. The pyriform cardiac bulb contains a more or 

 less spheroidal, simple valve, two-sevenths as wide as the bulb itself. The oeso- 

 phagus has a subdistinct, narrow lining, and a fine musculature. The intestine, 

 which has a more or less thick wall and a faint lumen, soon becomes half as wide 

 as the body. In cross-section it presents but few cells. The cardiac collum is one- 

 fourth as wide as the base of the neck. The widest of the variable, colorless gran- 

 ules found scattered in the intestinal cells are twice as wide as one of the annules. 

 The longitudinal fields are three-fifths as wide as the body. The tail is conoid from 

 the rather prominently raised anus. The large, rather frail, tapering, somewhat 

 blunt spicula, at their widest parts, near the proximal ends, are one-fourth as 

 wide as the corresponding portion of the body. There is a rather frail, slender 

 accessory piece. The elevated, "campanulate," subequidistant supplementary 

 organs begin opposite the proximal parts of the spicula and are stationed at a 



