138 CALIFORNIA ACADEMY OF SCIENCES. 



were not visible from the exterior and could only be ascertained by dissection and 

 transparent light. Viewed from the exterior the clitellum appears incomplete. 



Penial sefM. The longer seta is hooked at the apex and furnished with five 

 notches on the inner side, very much as in B. Bolavi. The shorter seta is less curved 

 and about | as long as the larger setse. It is not hooked and the free apex is slightly 

 forked, each prong being of the same length. There is no flare or wing between the 

 two prongs (figs. 60, 61 and 62). 



Oviducts. Both open together in a central pore in the median line in xiv, 

 very close to the groove between xiii-xiv. In the largest of the two adult specimens 

 the ovipore was situated abnormally between xv and xvi. 



Inteaiine and glands. A strong supra-pharyngeal gland as usual. Gizzard in 

 vii and viii, separated by a thin wall, as in other species. Tubular intestine extends 

 from gizzard to xvii, and is in xv, xvi and xvii furnished with the three pairs of 

 calciferous diverticula, of which the two anterior ones are of diflferent construction 

 histologically just as in other species. The sacculated intestine commences in xviii. 

 There is a typhlosole. 



Sjm'mathecfe. As usual, in vii and viii. Those in vii were slightly smaller, 

 and entirely confined to their somite, while those in viii projected their distal part 

 through the septum into ix. The distal part is only a little smaller than the other 

 part. The spermatheca is much flattened. Seen from below it appears as in fig. 52 m, 

 while seen from the side it looks as in fig. 52 n. The lower part is furnished with 

 a very small diverticulum, pointing forwards. The duct leading to. the pore is very 

 short, almost not set off from the lower sac. 



Oviducts are slender, tubular, with a small and narrow funnel. 



Kephridia. Those posterior to xix are furnished with a cffilomic cell mantle 

 of oval form, even and regular, and of the same size in tiie various nephridia. Pos- 

 terior to xix we find four rows of nephridia on each side of the median line, the rows 

 being regular and parallel. The most ventral nephridium or n is situated between 

 the setfe couples 1 and 2 and 3 and 4. The other nephridia h, c and d are dorsal and 

 lateral. The two dorsal nephridia d and d are about as equidistant as nephridia a and 

 a, and much closer together than the dorsal nephridia of B. nana, palmicola and 

 Bolavi, the three other species which I have examined. The more ventral part com- 

 prising the outlet duct, etc., of nephridium a is longer than the corresponding parts 

 of the other nephridia, and not covered by the coelomic mantle. The clitellar nephri- 

 dia are larger and their ducts thicker than the other anterior nephridia. The 

 nephridia anterior to clitellum are very small, except those in somites iv and v, where, 

 as usual, the nephridial ducts are long. Each nephridium appears perfect, and built 

 on the meganephric plan (fig. 63). 



Benhamia rugosa is readily recognized and characterized by the large papillse 

 on which open the two anterior prostate pores, by the four rows of nephridia, by the 

 forked smaller penial setse, by the corrugation of the anterior somites, inclusive of 

 clitellum, by the pointed prostomium, by the flattened spermathecas. 



Since this was written Rosa has described a new American Benhamia from 



