GAMMANEMA, TROGOLAIMUS 



293 



by obscure accessory pieces. The ejaculatory duct is about one-third as wide as 

 the body, the vas deferens about half. The testes are unusually short and broad, 

 only about four to six body-diameters long, and are, at their broadest, two- 

 thirds as wide as the body; they taper rapidly to the blind ends, which are only 

 about one-fourth as wide as the body. 



Habitat: Marine; coral sand. New Hebrides. Sublimate to balsam. Fig. 74 

 p. 292. 



lb(6) 



ndm 



75. Trogolaimus uniformis n. sp. '^ M : ^ ' i~~f^~~i~ ' Lip-region 

 divided into twelve parts, readily distinguishable, though not cutinized. The 

 broadly cup-shaped anterior por- 

 tion of the pharynx is that part 

 referred to in the formula. From 

 its rather flattish base three 

 apophyses extend backward close 

 together, near the axis of the ' 

 head, a distance about equal to 

 the depth of the open portion of asc - 

 the pharynx, thus adding a second 

 chamber. Each of these apophy- - 

 ses has a small, inward-pointing 

 onchium at its apex. These &$ 

 onchia meet together and cross at the middle of the floor of the anterior portion 

 of the pharynx. As usual, the apophyses serve for the attachment of muscles, 

 and all that portion of the pharyngeal bulb in front of the bases of the apophyses 

 is different in character from the wall of the oesophagus, being more completely 

 fibrous and destitute of the large nuclei that occur in the oesophageal muscula- 

 ture. The oesophagus continues with the same diameter until after it passes 

 through the nerve ring, when it begins to expand gradually, so that finally it 

 is more than half as wide as the base of the neck. In optical section the lining 

 of the oesophagus appears wavy. There is no distinct cardia. The intest ne, 

 which is separated from the oesophagus by a deep constriction, becomes at once 

 about three-fourths as wide as the body. Its cross-section probably presents 

 two to four cells. These contain a multitude of minute, evenly distributed 

 granules. The walls of the cells are refractive. The lateral fields are about two- 

 fifths as wide as the body, and appear to be composed of two rows of cells. 

 Renette unknown. The tail of the male is conoid from the prominently raised 

 anus. It diminishes in diameter rather slowly until near the end. The diam- 

 eter of the base of the spinneret is about one-sixth to one-eighth as great as that 

 of the base of the tail. The caudal glands appear to be located in front of the 

 anus. In Cyatholaimus, with which Trogolaimus may be compared, it is usually 

 easy to discover the ventral gland and excretory pore. So far these have not been 

 seen in the present species. The following is a description of the tail of a young 

 female : The posterior lip of the anus is distinctly raised and rather broad. The 

 rectum is somewhat longer than the anal body-diameter. The tail is cylindrical 

 to the rounded or conoid-hemispherical terminus, which ends in a somewhat 

 cylindrical spinneret, having a diameter about one-sixth as great as that of 

 the base of the tail. The length of the tail is about two and one-half times as 

 great as that of the anal body-diameter. This description is derived from a 

 specimen in which the sexual organs are represented by an oval body consisting 

 mainly of two cells. Supplements twenty-one, slightly elevated, flat, similar 

 to those frequently seen on the males of Chromadora. These organs occupy a 



