1902.] NATURAL SCIENCES OF PHILADELPHIA. 81 



ventral bimdle.s the set?e increase in size to somite IV, where they 

 are about one and one-half times as long as on II, and distinctly 

 larger than the dorsal setje of the same somite. This relative size 

 of dorsal and ventral setae continues to at least somite X, 



A small cephalic pore exists between the prostomium and peri- 

 stomium, but other dorsal pores are wanting. The genital pores are, 

 as usual in the family, the male on XII, the female ^'j^, and the 

 latter slightly the more mesiad. The clitellum is undeveloped. No 

 pigment is apparent anywhere and the blood shows no trace of 

 color in the alcoholic specimens. Prof. Verrill's label describes 

 the living worms* as " white." 



Pepto-uephridia are certainly absent from the example sectioned, 

 and none could be detected in the type specimen when cleared in 

 glycerine. Conspicuous septal glands are developed on -y|> -yjj and 

 ^j, and open in the usual way on the pharyngeal pad. As a re- 

 sult of great development of muscular tissue all of the dissepi- 

 ments between the last septal gland and the tesles somite — that is 



^^' ^f^' ^ ^^^ ~^i — ^^'^ much thickened. 



The spermathecfe (fig. 1) occupy somite YI, and open to the 

 exterior in the furrow y^ on a level nearly midway between the 

 dorsal and ventral setre- 

 buudles. The duct is 

 a simple thick-walled 

 tube having a length 

 about equal to the flask- 

 shaped ampulla, into 

 the bulbous base of 

 which it opens on the 

 latero-dorsal aspect, 

 from which a striking 

 asymetry of the en- 

 tire organ results. Uni- 

 cellular glands, Avhich 

 are such a conspicuous 

 feature of the sper- 

 mathecal duct of E. 

 albidus, are altogether 

 absent from the exam- 

 ples here described. The 

 G 



ampulla is regularly tlask-sh!4)0(l, with 



