natural, history

(Pberetima sp.St.: L. 357, Lavanggu, culti~atedExp.).area, 15. Oct. 1951.- 1 juvenile specimen (Dan.External characteristics. Length, 90 mm. (but softened). Diameter, 4 mm.Segments, ca. 126. Pigmentation red, color much brighter and denser than in any ofthe other Rennell Islands worms. First dorsal pore on 12/13. Setal circles complete onthe clitellar segments; viii/4, xviii/2. Spermathecal pores on 7/8-8/9 not far from themidventral line. Male pores clearly postsetal. Male porophores, genital markings,glandular areas in vicinity of spermathecal pores apparently lacking.Internal anatomy. Septa 8/9-9/10 lacking. Intestinal origin in xv. Typhlosolerudimentary but still lamelliform. Intestinal caeca simple, apparently originating inxxvii and extending into xxv, dorsal and ventral margins constricted by the septa.Last hearts in xiii. A commissure of x apparently is present on one side at least.Testis sacs apparently paired, no transverse connection recognizable, those of xireaching into contact with ventral ends of seminal vesicles of that segment whichapparently are not included.Spermathecae juvenile. Duct short almost confined to the parietes. Diverticulumabout as thick as the duct into the anterior face of which it passes and without externaldemarcation into stalk and seminal chamber, longer than the ampulla.Pberetima upolueosis (Beddard) 1887Pheretima upoluensis Gates, 1937, Ball. Mus.Compo Zool. Harvard, 80:332-334.St.: L. 372, Lavanggu, rain forest 20. Oct. 1951. - I clitellate specimen, broken orautotomized into 3 pieces of which only the two anterior are present (Dan. Exp.).Extern'al characteristics. Setae: viii/8, xviii/2, xix/IO. Spermathecal pores aresmall, not crescentic and with grey translucent areas around them.Genital markings: median, unpaired and presetal on xviii and xix, paired, slightlylarger postsetal markings on xvii, xviii, xix. Those of xvii and xix are just median tothe male pore lines but those of xviii are just lateral to the lines. A postsetal markingalso is present on the left side of ix, slightly median to the spermathecal pore line.Internal anatomy. Septa 10/11-12/13 are muscular. Intestinal caeca are short,reaching forward into xxiv or xxv. Hearts are present in xi, probably present in xthough empty and collapsed.The testis sac of x is unpaired and ventraJ. The sac of xi is mostly ventral, u-shaped,and contains the small seminal vesicles of xi. Vesicles of xii are also small. The pseudovesiclesof xiv are about as large as the vesicles of xii.The spermathecal diverticulum which is as long as or longer than the main axis andpasses into the anterior face of the duct close to the parietes, has a long, smooth stalkwith muscular sheen. The small seminal chamber is shortly ovoidal, and only slightlythicker than stalk from which it is distinctly demarcated.10