BY N. A. COBB. 387 



latter is behind the anterior extremity; the right organ is a left- 

 handed spiral of three winds, whilst the left one is a similar 

 right-handed spiral. The simple toothless cup-shaped pharynx is 

 one-third as wide as the head. The anterior part of the conoid 

 oesophagus is one-half, and the posterior part two-thirds, as wide 

 as the corresponding part of the neck. The lining of the oeso- 

 phagus is distinctly to be seen when the organ is viewed in optical 

 section. The thick-walled intestine, which is one-half as wide as 

 the bod}^ is separated from the oesophagus by a deep and distinct 

 constriction ; the cells of which the intestine is composed are 

 closely packed with fine granules. The ventral gland, lying in 

 the cardiac region, empties by means of a wide duct and sub- 

 spherical ampulla, through the pore situated just behind the 

 oblique nerve-ring. The lateral fields are one-fourth as wide as 

 the body. The anterior half of the tail is conoid from the slightly 

 depressed anus; thence to the barely swollen three-haired terminus 

 it is cylindroid, with a width equal to that of the spicula. The 

 tail bears numerous short hairs; caudal glands are present. A 

 pre-anal ventral row of fifteen small gland-outlets occupies a 

 distance one and one-fourth times as great as the length of 

 the tail; four of them occur opposite the spicula, but the 

 interval between each two successive outlets increases anteriorly. 

 The hairs immediately in front of and behind the anus are better 

 developed than those more, remote, as is usually the case. The 

 two equal, linear, very acute, arcuate spicula are widest in the 

 middle, the proximal half being composed of four pieces of chitin; 

 the proximte can hardly be said to be cephalated. The two 

 accessory pieces have spike-shaped processes extending backward 

 parallel to the body axis, a distance equal to half the anal body- 

 diameter. The ejaculatory duct has a length twice as great as the 

 length of the tail. The junction of the two testicles is near the 

 beginning of the middle third of the body. 



Found in sand at a depth of four to five fathoms, Port Jackson, 

 New South Wales, Australia. 



^ -2 6-2 10- —48—^^ 92- „ ^ ^, 



COMESOMA SIMILIS, n.sp. -g 2-1 2^5 sT"" — 2^ u-3mm. 'J^j^q 



cuticle of this species is very closely and finely punctate, and at 



