BY N. A. COBB. 391 



outlet for the three caudal glands, which were to be dimly 

 seen. These few notes comprise all that is known concerning the 

 structure of a worm which, were it less remarkable, I should not 

 notice at this writing. 



Hah. — Sea-sand, Bay of Naples, 1888. 



II. Pelagonema, new genus. 



Pelagonema is a genus related to Oncholaimus. The walls of 

 the pharynx, however, bear no teeth. At the very base of the 

 pharynx an indistinct elevation is to be seen, but I am doubtful 

 whether it is homologous with any mouth-part in Oncholaimus. 

 The neck is slender and tapers much. The oesophagus is very 

 narrow in the anterior half, but gradually expands behind the 

 broad and conspicuous nerve-ring until in the posterior fourth it 

 becomes about three-fourths as wide as the neck. Opposite the 

 lower part of the pharynx are several bodies characterised by 

 staining in carmine. These are round or ellipsoidal and about 

 one-half as wide as the pharynx. It is probable that two of 

 these structures represent lateral organs. At any rate they are 

 not all alike. They are indistinct, and, furthermore, exceedingly 

 small, and therefore escape accurate observation. The tail is 

 elongated and slender, and its slightly swollen terminus gives exit 

 to the secretion of caudal glands. In the single known species 

 the female organs are double and symmetrically reflexed. The 

 worm has the general appearance of an attenuated Oyicholaimus ; 

 still, the mouth is so peculiar that I do not venture to class it as a 

 member of that genus. 



'6 9'8 21' '58 92*5 



P. SIMPLEX, n.sp. -6 1-1 — ri — 2^2 ^ 2- mm. The cuticula is 



apparently non-striated. No hairs of any kind were seen. The 

 conoid neck terminates in a rounded head, with lips resembling 

 those of Oncholaimus. The simple elongated pharynx is one-half 

 as wide as long. Opposite its lower part occur structures about 

 one-half as wide as the pharynx itself, bodies which may be 

 the lateral organs. There are no eyes. The lateral fields are 



