214 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Skr 



this paper, would also illustrate the structure of this organ 

 in B. nana, provided the anterior lobe was the smaller, 

 instead of vice versa as in the above mentioned variety. 



I have also re-examined Benhatnia B.,va.r. jiapillata, and 

 Benhamia B., var. -palmicola, and find that even in these 

 forms the two anterior calciferous diverticles are more or 

 less connected and that the posterior diverticle is separated. 

 In var. paptllata the two anterior diverticles open together 

 into one ciliated tube or fold, while the diverticle in XVII 

 is separated (fig. 76c). In Benhatnia nana the anterior 

 diverticle is very small (fig. ^6d). 



Benhamia viridis, sp. no v. 



Plate XIV, Figs. 175, 176. 



Definition. — Length no mm., width 4 mm. Somites 120 to 140. Pro- 

 stomium divides somite I completely, but the projection is a mere groove or 

 line often extending as far as somite III. Setae closely paired. Penial setas 

 present, not ornamented. Anterior dorsal pore XI/XII. Genital zone is a 

 square field formed by two elevated ridges interior to which are two more or 

 less parallel grooves. Six pairs of tubercles in somites XIV-XIX. Sperma- 

 thecal pores VII/VIII, VIII/IX. Spermiducal pores in the intersegmental 

 groove XVII/XVIII. Prostate pores in the equator of XVII and XIX. 

 Clitellum saddle-shaped, in XIII-XX. Gizzards in V and VI. Calciferous 

 diverticles in XV, XVI and XVII. Sacculated intestine in XVIII. Typhlo- 

 sole in XVIII and XIX. No sperm-sacs. Spermathecae in VIII and IX ; 

 large apical sac tapering towards the base ; a small wart-like, plurilobed 

 diverticle at the base. Hearts in VII-XII. Micronephridia in eight lobes on 

 each side of the median line. Color bright bluish green; clitellum a yellow- 

 ish brown. 



Habitat. — The type is from Toluca, Mexico, at an altitude 

 of 8,000 feet. One other specimen from the City of 

 Mexico. Collected by Professor A. Koebele. 



The most interesting character of this Benhamia is the 

 position of the spermiducal pores in the intersegmental 

 groove of somites XVII/XVIII, instead of in the equatorial 

 of XVIII as in all the other species. It thus forms a con- 

 necting link between the two genera Betikamia and Dicho- 

 gaster. If the spermiducal pores in Benhamia viridis had 

 been moved forward just one-half of a somite the species 

 would have been a typical Dichogaster . 



