136 CALIFORNIA ACADEMY OF SCIENCES. 



seta differs entirely from that of the B. Bo/ari group. Instead of being more or less 

 distinctly forked and wider at the apex, as in those species, it is drawn out to an ex- 

 ceedingly thin hair-like point, which is sigmoid (fig. 43 e). In shape the seta is almost 

 straight, with the two ends slightly curving. 



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

 the exterior apex of a prostate. With a low power lens these papillae 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 much contracted, and the papillae 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 gi'eatly 

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

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

 discern any sense cells. 



The spermathecfe differ in shape from those of B. palmicola. The apical sac 

 is not globular, but pointed and narrow, as represented in fig. 52 g and h. 



The nephridia also differ some from those of B.pahnicoia. In this species the 

 inner nephridium, or a, consists of two parts, each one with a co^lomic mantle separate 

 from the other, but in B. papillata nephridium a consists of three distinct parts, each 

 one with a coelomic mantle. This, of course, refers only to the posterior nephridia; 

 the anterior ones are not covered by coelomic mantle. 



Sperm-sacs in x 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. 56-63. 



Habitat. Native habitat unknown. The eight specimens in my 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. 

 July, 1895. 



Color reddish flesh. 



EXTERIOR CHARACTERS. 



Size, 30 mm. by Ij m. 



Segments, 118. Cephalic lobe very long, pointed. 

 Clitellum incomplete. 

 Dorsal pore, most anterior v-vi. 

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

 Prostate pores, the anterior ones elevated on tubercles. 



Penial setce. Largest seta with five notches, smallest seta forked with prongs 

 of equal size. 



Common setce. All ventral in four couples; the inner setae are present in xviii. 



