PACIFIC COAST OLIGOCH UTA, 159 
athece varied some, but the general shape appeared quite constant within certain 
limits. The figures appended represent the spermathece taken from one specimen. 
There is a narrower muscular basal tube and a more swollen non-muscular chamber 
as usual, the structure of which offers no characteristics. 
Sperm-sacs. Of the two pairs of sperm-sacs the anterior one in somite xi is 
much the narrowest in the direction of the median longitudinal diameter of the body. 
It is principally ventral in location, but extends upwards and joins the one from the 
opposite site. It is closely surrounded by a sperm reservoir without enclosing mem- 
brane. The sperm-sacs in xii are much broader and longer, but are generally only 
dorsal and do not enclose the intestine in any of the specimens sectioned. This rela- 
tive size of the two pairs of sperm-sacs appeared constant. Somites ix and x are 
transformed into two very extended sperm reservoirs. 
Ovaries in the various species are long and flat, not lobed, and in both longitu- 
dinal and transverse section offer to view a single undivided surface. 
Oviducts are very broad and furnished each with an ovisae consisting of an in- 
vagination of the septum, which in all my specimens were filled with large gregarine, 
rarely containing any ova. 
Ciliated rosettes are similar to those of Sp. benhami in size. The spermduets run 
ventrally to as the tubercula pubertatis, about four times as far laterally and dorsally 
from seta 2, as 2 is distant from seta 1. The spermiducal pore is similarly situated 
ventrally to the tubercula pubertatis, This characteristic is in all the species only 
shared by Sparganophilus sonome. All other species are characterized by having the 
spermduets run dorsally as to the tubereula pubertatis. The spermiducal pore is simi- 
larly in Sp. Smithi situated ventrally to the tubercula pubertatis, and is found in the 
intersegmental groove between somites xix/xx. 
Prostates or spermiducal glands (Beddard). There are three pairs of spermi- 
ducal glands, one pair each in somites xxii, xxiii, xxiv. One specimen possessed only 
one gland in xxiv, and there may possibly be found some variation in number when 
more specimens have been investigated. In all cases these glands were much smaller 
than in Sparganophilus Benhami, but otherwise almost similar in structure, except for 
the entire absence of the basal muscular duct. The glandular part was never large 
enough to be folded on itself lengthwise, but its tube was much twisted in the direction 
of its long diameter, often to such extent that cross-sections always showed the tube 
as three or four circular openings, surrounded by a wall two cells thick. The museu- 
lar basal part is absent, and the lower tube, where it enters the muscular layers, being 
very short, is surrounded by a thin layer of connective tissue. The whole organ in 
mature specimens projects only slightly above the body-wall, and the glandular part 
is in either diameter not any thicker than the body-wall. 
Nephridia are in this species covered and perforated by numerous blood 
capillaries, to a much greater number than in Sparganophilus Benhami, but similar to 
what is described in Sp. tamesis and Sp. Hiseni. Otherwise the nephridia of the re- 
spective species appear to be of the same general size and structure. 
Vascular system. The hearts begin in xi, and extend forwards to viii. In xii 
