BY N. A, COBB. 467 



boomerang-shaped spicula are of uniform size throughout and 

 their length is one and one half times as great as that of the 

 anal diameter. The two accessory pieces, joined distally, are 

 parallel to and one half as long as the spicula and are protruded 

 with them to a certain extent. No ventral papillae. 



Hah. — Adults of both sexes were apparently equally common in 

 beach sand between tide-marks, at Aden, Arabia, in February. 



Spilophora, Bastian. 



S. Ceylonensis, n.sp. Female unknown. 



1-5 2-4 — gr-^:^ — ^1-2 mm. The cuticula bears hairs, striae (375 in all) 

 and dots similar to those already described and figured by Dr. 

 De Man for his *S'. jjaradoxa. To the conoid neck succeeds a trun- 

 cated head whose lip region, presenting ten or twelve obscure 

 papillae, is set off by a constriction situated opposite the apex of the 

 single dorsal pharyngeal tooth. From the depths of this ccustric- 

 tion spring the four slender cephalic setae, which are one half as 

 long as the head is wide. I saw no lateral organs. An indistinct 

 pharyngeal bulb receives the pharynx, which is anteriorly rather 

 cyathiform. Posteriorly the oesophagus expands into a large 

 elongated-pyriform double bulb nearly one third as long as the 

 entire neck. This bulb is separated by a triple-chambered internal 

 cavity, — containing nuclear matter that stains strongly, — into two 

 parts, one in front of the other, each of which contains a distinct 

 elongated chitinous structure. That portion of the cesophagus in 

 front of the posterior bulb is not of uniform diameter but averages 

 one fourth as wide as the neck. The nerve-ring is nearly as wide 

 as the cesophagus at the point encircled and is not at all oblique. 

 The intestine is attached to the centre of the rather flattened 

 posterior surface of the cardiac bulb and is at first very narrow. 

 Its rather thin walls are composed of cells containing coarse 

 granules of a brownish colour. These cells are of such a size that 

 three build the circumference of the intestine. I discovered 

 nothing concerning the ventx'ai gland. The tail is nearly conical, 

 being in reality slightly concave. The two linear spicula are 



