8 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 81 



divisions of the body, and in size and armature of the proboscides. 

 R. coronatus is 6 mm to 9 mm long by 0.8 mm to 1.166 mm wide, with 

 the posterior part of the body four to five times as long as the anterior 

 part. The proboscides are very long, up to 1.3 mm, and may reach to 

 the anterior border of the acetabulum ; each is armed with a longitudi- 

 nal row of 10 to 12 spines, the longest of which measure 62/i, in length. 

 R. hacuUfer is 10 mm to 12 mm long, with the fore body smaller 

 and the hind body much longer than in corbnatm. The proboscides 

 are only 0.26 mm long, and are provided with a group of seven or 

 eight spines, not arranged in a row, with a length of about T3/a. 

 R. homdus is a much shorter and relatively broader species, only 

 2 mm to o mm long, with a maximum breadth of 0.73 mm ; the hind 

 body is about three times as long as the fore body. The proboscides 

 are 0.26 mm long, and are covered with numerous small spines, 

 about 36/x to 41/a long. R. inacracanthus^ here described, comes 

 nearest to liorridus in size and proportions, but the armature of the 

 proboscides is entirely different. The spines in this species are 

 much larger than in any of the others. 



ASPmODERA HARV/OODI, new species 



Figure 4 



Diagnosis. — Small white worms, tapering at each end. Lips 

 large and distinct; cephalic cordons reach l70/x to 220/^ from 

 anterior end. Cuticle striated. Esophagus 1.05 mm to 1.8 mm long, 

 ending in a pear-shaped bulb about 210/i in diameter and 300/x, long. 

 Nerve ring about 500/a from anterior end. Excretory pore about 

 725;u, from anterior end. 



Female., 6.6 mm to 9.5 mm long, with a maximum diameter of 480/i 

 to 490/x. Vulva divides body in the proportion of about 2 : 3. Anus 

 about 900,a to 1.15 mm from posterior end. 



Bfale., 7 mm to 7.5 mm long, with a maximum diameter of 320^ 

 to 410/x. Tail 480;a to 560^ long. Spicules equal, ending in narrow 

 blunt tips, 1.15 mm to 1.29 mm long and about 40;u wide at the base. 

 Accessory piece troughlike at base, flattened at tip, about 170^ to 

 195/i long. Sucker, including chitinous rim, about 100/x in diameter. 

 Cloaca with very prominent lips, each provided wdth a papilla- 

 like process directed away from the opening. A pair of large 

 mammillate papillae just anterior and just posterior to sucker, 

 another mammillate pair a little farther anterior to the sucker, and 

 another a little behind the posterior lip of the cloaca. These pairs 

 are constant. In addition there are a number of other pairs that 



