28 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



The vasa deferentia are looped in xii and xiii and then pass straight 

 back into xviii and under the prostatic ducts. Each vas deferens 

 then bends in toward the nerve chord and is enlarged into an egg- 

 shaped body which is buried in the parietes just behind the prostatic 

 duct. The prostatic duct is usually 14-15 mm. long. The prostates 

 are 55-65 mm. long. 



The penial setae are 3 mm. or less in length, 15-25 micra thick 

 near the tip, and 35-40 micra thick at the place of greatest enlargement 

 near the inner end. The shaft is curved into a slight suggestion of 

 a spiral but is flattened out by pressure of the cover glass into a wide 

 arc. The tips of most of the setae examined are either missing or 

 obviously deformed or softened. In the few undamaged setae the 

 tip is bent slightly and hollowed out into a spoon shape. The 

 ornamentation begins very close to the tip, extends 0.4-0.5 mm. along 

 the shaft, and consists of numerous ridges of very fine teeth. The 

 teeth are close together and the rows of teeth are 

 not frequently broken and are fairly regularly spaced. 

 The clitellar and preclitellar setae have ornamen- 

 tation similar to that on the penial setae, but the 

 toothed ridges are more frequently broken and far- 

 ther apart and not so regularly spaced. 



EUTYPHOEUS CONSTRICTUS, new species 



6 



Description of the type-specimen, external charac- 

 FiGURE 14.-EUTYPH0. tcristics (Cat. No. 19261, U.S.N.M.). — Length, 122 

 Eus BiFoyis. a. Pen- j^j^^ Diameter, 4-6 mm. Number of segments, 



lAL SETA X ABOUT 450. ' _ _ _ fc> » 



6. Penial seta X 224. Color: Very light grayish white, except the 

 *^°"^ clitellum which is reddish. 



The prostomium is prolobous and partially withjdrawn into the 

 buccal cavity. 



On segments iv-xii there is a deep secondary furrow posterior 

 to the setae of the segment. On vi-xii there is a deep secondary 

 furrow anterior to the setae of the segment. There are slight furrows 

 on xiii anterior to the setae. Posterior to the clitellum there are two 

 slight secondary furrows per segment. 



The first dorsal pore is small and is in 10/11. Pores are also pres- 

 ent in 11/12, 12/13, 13/14, 16/17, and posteriorly. There are non- 

 functional pore-like depressions in 14/15 and 15/16. 



The setae are eight to each segment and begin on ii. They are fine 

 and in places on the anterior segments are retracted into the body 

 wall. Behind the clitellum ah is about equal to one-half of cd, he is 

 greater tha'n cd and less than aa, dd is greater than one-half of the 

 circumference. 



The clitellum extends from just anterior to the setae of xiii to 

 17/18 (43/^). It is ring shaped and complete except on the ventral 



