BY N. A. COBB. 403 



neck; its lining is distinctly to be seen. The intestine, wliich is 

 separated from the oesophagus bya shallow but distinct constriction 

 is one-half as wide as the body and is composed of cells contain- 

 ing coarse granules so arranged as to give I'ise to an obscure 

 tessellation. The ventral gland is situated behind the cardiac 

 constriction and empties through a ventral pore opposite the 

 nerve-ring. The latter encircles the oesophagus squarely. The 

 anterior half of the glabrous tail is suddenly conoid from the 

 anus; thence to the barely swollen long-apiculate terminus it is 

 cj'lindroid and one-eighth as wide as at the anus. Caudal glands 

 are present as usual. A pre-anal ventral row of six small equi- 

 distant supplementary organs occupy a space twice as long as the 

 length of the spicula. The two equal, linear, arcuate spicula are 

 one and one-half times as long as the anal body-diameter ; their 

 proximal ends are not cephalated, but they are bent towards the 

 ventral side of the body. The two equal narrow accessory pieces 

 are three-fourths as long as the spicula, which they envelope at 

 their apices. 



Found in sand at the bottom of Port Jackson, New South 

 Wales, Australia, at four to six fathoms depth. 



Cyatholaimus brevicollis, n.sp. I have seen but a single male 

 of this handsome little species. The proportions of the head and 

 neck remind one strongly of Spilophora, but the presence of spiral 

 lateral organs on the head, and of a ventral row of pre-anal acces- 

 sory organs in the male, make it a species of doubtful affinity. 

 My measurements gave the formula ^.^ ^.^ ^ -^ — ^- — ^ i-ssmm. 

 The transparent skin presents very inconspicuous hairs, if any, 

 and is traversed by about six hundred transverse stride, two 

 micromillimetres apart, and consisting of rows of circular dots 

 which become larger as the lateral fields are approached; there 

 they arrange themselves also in three longitudinal rows which 

 become indefinite near the head and of which the middle one is 

 exactly lateral. Just outside the three rows of dots I observed two 

 chitinous wings, one on either side. The space occupied by the three 

 lateral rows of dots is one-fourth as wide as the body of the worm. 

 The neck of the worm is convex-conoid and terminates anteriorly 



