282 



ORDER SYNOUONTIA 



hmoe. 



The 



probably different, and the structure of the male differs materially from the 



structure of the male of Monhystera, dark-colored, punctate, out-bending spic- 



ula; and two g ,. seHfh(/2\ i tf to (6) \ Jb\(6) 



testes. A very IT"~i8-~i9 5.1" " 3.2 V 



similar marine 1% !.__ ""im. 1260. 



species occurs * 2 -~ * 



in the harbor at Portsmouth, N. H., and at / a 13X6) 



Woods Hole, Mass., U. S. A., namely Dapto- 



nema fimbriatum, n. sp. of which the formulae 



and the figure of the head end are given on 



this page. The head of Daptonema fissidens 



differs but slightly from that of D. fimbriatum. 



Daptonema is manifestly an offshoot of Monhystera. Probably 



the eighteen refractive labial elements are ribs attached to a 



thin membrane. They sometimes appear, however, as if free at 



the extremities, and if so, would function as combs in securing 



the food, which is probably combed or scraped from the surface 



of algae and other submarine objects. Fig. 660. p. 281 (fissidens) ; 



Fig. 666 (fimbriatum). 



.6 2.6 4.3 -70." 



67. Crystallonema fuscacephalum n. sp. /l- ' 1- 14 

 longer, cephalic setae are two-jointed. The scattered, inconspicuous cervical 

 setae are one-tenth as long as the neck is wide. Opposite the pharynx the head 

 contains dark brownish gray pigment. The consistency of the labial palps (?) 

 remains undetermined, that is to say, it is uncertain whether they are apodontia 

 with an inward stroke and capable of executing a firm grip, or whether they are 

 more or less flabby palps. Neck somewhat cylindroid, expanding a little toward 

 the head. Amphid with a pore near the posterior margin, from which there 

 set Cph(4] \ pip Jb set U) (6 I ^ ea ds inward and backward a narrow duct 



with granular contents. There is a faint, 

 elongated, more or less pyriform cardiac 

 swelling. Near the nerve-ring the oesoph- 

 agus is one-half, just in front of the cardiac 

 swelling three-fifths, and finally two-thirds, 

 as wide as the corresponding portion of the 

 neck. The musculature of the oesophagus 

 is rather coarse and colorless. Cardiac col- 

 lum two-fifths as wide as the body. The 

 intestine begins with a specially modified 

 segment, two-thirds as long as the corre- 

 Itrm s P on ding body diameter. The intestine, 

 rhicli has a somewhat irregular lumen, 

 1 75Q gradually becomes one-half to two-thirds 

 as wide as the body. The colorless gran- 

 ules in the intestinal cells are scattered in groups and -are of variable size, the 

 largest granules being about as wide as one of the annules on the neck. The 

 nema is strongly characterized by the presence of more or less angular, doubly 

 refractive crystalline masses, having about the same diameter in every direction, 

 and being about one-sixth as wide as the body. The crystalline bodies are one- 

 half to one body-width apart and seem to lie in the longitudinal fields. The 

 conoid tail tapers from the anus, but at last for a short distance is more or less 



hanoe 



