88 OPISTHOBRANCHIATA OF BRAZIL 



Vagina and duct. Parallel to the praeputium and a little 

 behind it pass the more slender vagina and vaginal duct. Their 

 combined length is much less than that of the vas deferens and 

 the praeputium. The vaginal duct (PL XV, fig. 82, vag. d.), 

 passes inward between the prostate gland in front, and the sper- 

 matotheca, opening into the latter after a course of ca. 2.0 mm. 

 The spermatotheca (PL XV, fig. 82, spth.} is ellipsoidal in form, 

 3.0 mm. in length by 2.5 mm. in width, and is covered almost en- 

 tirely by the prostate gland and the adjacent organs, being exposed 

 only for a small portion of its extent upon the inner face of the 

 anterior genital complex. The uterine duct (PL XV, fig. 82, u. 

 d.) is given off very close to the entrance of the vaginal duct, 

 passes directly outward, becoming visible upon the outer surface 

 of the mass, curves backward beneath the spermatocyst, and 

 opens into the cavity of the nidamental gland. It receives, not 

 far from its origin, the short duct of the pear shaped spermato- 

 cyst, which lies upon the upper outer border of the median 

 portion of the complex. In length it measures i.o mm., in 

 width 0.5 mm. 



Owing to the loss of this portion of the material, which 

 was being dissected at the time of the earthquake of April 18, 

 1906, I am unable to give any further details as to the structure 

 of the prostate, nidamental and albumen glands. 



The anatomy of the other organs of this species do not depart 

 markedly from the other members of the genus. 



This species is named in memory of Dr. Arthur W. Greeley, 

 the zoologist of the expedition, whose untimely death cut short 

 a life full of promise in his profession. 



Type No. 148, Invertebrate Series, Leland Stanford Junior 

 University Zoological Museum. 



