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 rej^resents the inner part of one of the anterior 

 nephridia is held somewhat diagrammatic, as the respective thicknesses of the canals 

 could not be pi'operly 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. 43-55. 



Habitat. Miraflores, in the Cape Region of Baja California, some 40 miles 

 north of San Jose 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 Jose del 

 Cabo or at San Bias. 



Color. The specimens are pink flesh, much less opaque than B. nana, no pig- 

 ment cells. 



General Remarka. For the present I arrange this as a subspecies under 

 B. Bolaci, from which it differs in several points of considerable importance. These 

 are the different form of spermathecte, the situation of the first dorsal pore, the difiei"- 

 ent sculpture of the largest penial seta, the location of the gizzard, the number of 

 sperm-sacs, etc. 



EXTERIOR CHARACTERS. 



Size 50 to 60 mm. 



Somites 110. "^ 



Clitellum incomplete in all somites xiii-xx. 



Dorsal pores, most anterior one between iv-v. 



Sperrnathecal pores in line with setae 1 and 2, between vii/viii and viii/ix. 



Ovlducal pore. One central median oviducal pore in xiv. 



Penial setce, 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, and a thin membrane extended between the two forks. 



Common set(e. 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 xviii. 



Septal glands, small in ix and x. 



