16 PROCEEDHiTGS OF THE NATIONAL MUSEUM vol.75 



Bemarks. — The length of other specnnens varies from 190-215 

 mm., and the diameter from 3-4 mm., at the posterior end, to 

 5-6 mm., at the thickest portion of the anterior end. 



The prostomium is prolobous in all specimens in which it is visible. 



In one specimen the first dorsal pore is in 8/9, but is much smaller 

 than the pore in 9/10. 



The clitellum begins anywhere in the region from 12/13 to just 

 behind the setae of xii, but practically always extends to 16/17, in a 

 very few specimens ending just behind the setae of xvi. 



The typhlosole begins in the clitellar region, occasionally in seg- 

 ment xiv, gradually diminishes in size posteriorly and ends 85-90 

 mm. from the anterior end. 



The prostates lie in segments xvii-xxiv. The prostatic duct is 

 2-3 mm. long and is usually straight, sometimes bent slightly, less 

 often coiled. 



Both pairs of spermathecae are usually in vi, but occasionally the 

 anterior pair is in v, in which case the ducts pass through 5/6, vi, 

 and into the body wall in 6/7. The spermathecal duct is short and 

 fairly stout. The ampulla is two to four times the length of the 

 duct, club-, heart-, or irregularly shaped. The single short diverti- 

 culum is also rather variable. It may be a small wart-like projection 

 from the spermathecal duct, or club-shaped, or more elongate and 

 either straight or slightly bent at the free end. 



NOTOSCOLEX LUNATUS, new species 



Description of the type-specimen, external characteristics (Cat. No. 

 19262, U.S.N.M.).— Length, 201 mm. Diameter, 4-6 mm. Number 

 of segments 314. Color: Unpigmented, very light grayish-white color, 

 except the clitellum, which is brownish red. 



The prostomium is small and withdrawn into the buccal cavity. 



The first dorsal pore is in 9/10. Pores are also present in 10/11, 

 11/12, 12/13, and from 16/17 posteriorly. 



Segments iv-xii, inclusive, have a deep secondary furrow posterior 

 to the setae. Segments vi-viii have in addition a slighter furrow 

 anterior to the setae. Segments ix-xii have a deep secondary fur- 

 row anterior to the setae. On the ventral side of segments vi and 

 vii there are numerous short furrows perpendicular to the interseg- 

 mental and secondary furrows. 



There are eight setae to each segment in four pairs. The first 

 setae are on segment ii. Anterior to the clitellum the setae are small 

 and not easily seen, but ah appears to be smaller than cd, and aa less 

 than he. Just posterior to the clitellum ah is very slightly less than 

 cd, and aa and he are about equal. More posteriorly he gradually 

 diminishes and becomes smaller than aa. Similiarly cd diminishes 

 so that ah and cd become equal. 



