130 CALIFORNIA ACADEMY OF SCIEN'CES. 



seta differs entirely from that of the B. Bolnri group. Instead of being more or less 

 di.stinotly forked and wider at the apex, a.s in those species, it is drawn out to an ex- 

 ceedingly thin hair-like point, which is sigmoid (fig. A?> e). In shape the seta is almost 

 straight, with the two ends slightly curving. 



The papillce of the genital region are most characteristic. Each papilla forms 

 the exterior apex of a prostate. With a low power lens these papilhe appear round, 

 but under a higher power they appear rosette-like, and consist of two or three divisions, 

 one on top of the other. The ventral part of segments xvii, xviii and xix, carrying 

 the genital pores, is iniich contracted, and the papilhe appear as in a bunch. The 

 distance between the male or spermaducal pore and the prostate papilla is just about 

 the same as the base of the papilla. 



In a section the structure of the oviducal median papilla appears to greatly 

 resemble that of the tubercula pubertatis of Sparganophilus. T find there the same 

 relatively large number of tali, narrow cells, radiating from the ovipore, but I cannot 

 discern any sense cells. 



The spcrmathecie differ in shape from tho^e oi -B. pa /miroln. The apical sac 

 is not globular, but pointed and narrow, as represented in fig. •')2 o and h. 



The nei)hridia also differ some from those of B.palmwjln. In this species the 

 inner nephridium, or a, consists of two parts, each one with a c«elomic mantle separate 

 from the other, l)ut in B. pdpUlnta nephiidium a consists of three distinct parts, each 

 one with a ccelomic mantle. This, of course, refers only to the po.sterior ncphridia; 

 the anterior ones are not covered by ccelomic mantle. 



Sperm-sacs in .\ and xi, not racemose. In other respects, as far as I can judge 

 by a hasty examination, this form resembles B. palmicola. 



Benhamia rugosa n. sp. 

 Figs. o6-63. 



Hnhitat. Native habitat unknown. The eight specimens in niv possession 

 were found in the orchid house in the Golden Gate Park of San Francisco, California, 

 under pots. Two were adult, two imperfectly developed, the others immature. 

 duly, 1895. 



Color reddish flesh. 



EXTERIOR CHARACTERS. 



Size, 30 mm. by 1^ ra. 



SeijmenU, 118. Cephalic lobe very long, pointed. 

 . CrUellum incomplete. 

 Dorsal pore, most anterior v-vi. 

 Oviducal pore, one single in the median line in xiv. 

 Prostate j)oren, the anterior ones elevated on tubercles. 



Pen'ial seUe. Largest seta with five notches, smallest seta forked with jirongs 

 of equal size. 



Common setctt. All ventral in four couples; the inner setaj are present in xviii. 



