PACIFIC COAST OLIOOCn.'KTA. 159 



atheciP varied some, but the iiciuM-al shape appeared quite constant within certain 

 limits. The figures appended represent the sperrnathecie taicen from one specimen. 

 There is a narrower muscular l)asal tube and a more swollen non-muscular chamlxu- 

 as usual, the structure of \vhich olfers no characteristics. 



S'penn-ifacs. Of the two pairs of sperm-sacs the ant(;i'i<ir one in somite xi is 

 much the narrowest in the direction of the median longitudinal diameter (if 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 i)oth longitu- 

 dinal and transverse section offer to view a single undivided surface. 



Oviducts are very broad and furnished each with an ovisac consisting of an in- 

 vagination of the septum, which in all my specimens weic filled with large gregarinse, 

 rarely containing any ova. 



Ciliated rosettes are similar to tho.se of Sp^Benhaml in size. The sperraducts run 

 ventrally to as the tubercula pubertatis, about four times as fai- laterally and dor.sally 

 from seta 2, as 2 is distant from seta 1. The sperraiducal pore is similarly situated 

 ventrally to the tubercula pubertatis. This characteristic is in all the species onlv 

 shared by Sparyanoplulus sonoma^. All other species are characterized by having the 

 spermducts run dorsally as to the tubercula pubertatis. The sperraiducal pore is .simi- 

 larly in Sp. Smithi situated ventrally to the tubercula pubertatis, and is found in the 

 intersegmental groove between isomites xix/xx. 



Prostates or spermidncal glands (Beddard). There are three pairs of .s^Dermi- 

 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 Sparganophiliis Benliami, 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 muscu- 

 lar ba.sal 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. Eiseni. Otherwise the nephridia of the re- 

 spective species appear to be of the same general size and structure. 



Vasculfrr sijxti'm. The hearts begin in xi, and extend forwards to viii. In xii 



