132 CALIFORNIA ACADEMY OF SCIENCES. 
especially so on the posterior ones. The general structure of the nephridial canals 
and their windings resembles those of fully developed mega-nephridia (figs. 39, 40, 
41), but the smallness of these organs prevented me from definitely ascertaining the 
relative size and structure of all the canals. The canal leading to the outlet duct is 
strongly ciliated. Fig. 41, which represents the inner part of one of the anterior 
nephridia is held somewhat diagrammatic, as the respective thicknesses of the canals 
could not be properly delineated. I believe the most anterior nephridia are found in 
iii, in which somite they are very large, crowding each other. 
Benhamia palmicola n. subsp. 
Figs. 48-55. 
Habitat. Miraflores, in the Cape Region of Baja California, some 40 miles 
north of San José del Cabo; also around Tepic, territory of Tepic, on the Pacific 
Coast of Mexico. The altitude of Miraflores is about 1,000 feet, while that of the 
City of Tepic is about 4,000. Probably the species does not descend to the hot low- 
lands of the coast belt, at least no specimens have been found either at San José del 
Cabo or at San Blas. 
Color. The specimens are pink flesh, much less opaque than 6. nana, no pig- 
ment cells. 
General Remarks. For the present I arrange this as a subspecies under 
B. Bolavi, from which it differs in several points of considerable importance. These 
are the different form of spermathece, the situation of the first dorsal pore, the differ- 
ent sculpture of the largest penial seta, the location of the gizzard, the number of 
sperm-saes, ete. 
EXTERIOR CHARACTERS. 
Size 50 to 60 mm. 
Somites 110. 
Clitellum incomplete in all somites xili—xx. 
Dorsal pores, most anterior one between iy—y. 
Spermathecal pores in line with sete 1 and 2, between vii/vili and vilii/ix. 
Oviducal pore. One central median oyiducal pore in xiv. 
Fenial sete, two in each sac. The longer seta has apex curved and furnished 
with four blunt, bristle-like crenulations. The smaller seta has the point slightly 
forked, one prong being longer, anda thin membrane extended between the two forks. 
Common sete. About equal distance between the dorsal and ventral couples 
as between the ventral couples. 
INTERNAL CHARACTERS. 
Buccal cavity with a dorsal pocket of sense organs and glandular cells. 
Pharynx not situated far forward. 
Gizzards both apparently in viii. 
Calciferous diverticula, 3 pairs in xv, xvi and xyiii. 
Septal glands, small in ix and x. 
