. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Eartlnoorms from Henderson Island. 257 guf ; its dorsal edge is very convex and divided into 3 to 5 lobes. From the liilum of each gland originates a cylindrical muscular duct, which describes an S and opens directly to the exterior ; the terminal bursa copulatrix is wanting, Spermathecfe, two pairs^ in viii. and ix. segments. Each spermatheca has a medial long and slightly bent muscular duct. The main pouch has the same length, and is clearly distinct from the duct. The diver
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Eartlnoorms from Henderson Island. 257 guf ; its dorsal edge is very convex and divided into 3 to 5 lobes. From the liilum of each gland originates a cylindrical muscular duct, which describes an S and opens directly to the exterior ; the terminal bursa copulatrix is wanting, Spermathecfe, two pairs^ in viii. and ix. segments. Each spermatheca has a medial long and slightly bent muscular duct. The main pouch has the same length, and is clearly distinct from the duct. The diverticulum ends in a spherical or oval distal extremity ; it is longer than the main pouch. The duct of the diverticulum is S-shaped at its base and diminishes in breadth at the same region (text-fig.). Before and. Pherethna hendersoniana, sp. n. Spermatheca, x 6. behind each sperniathecal pore, at the internal surface of the body-wall, a whitish glandular mass {gL) is recognizable. Log. Henderson Island, S. Pacific (D. Tait coll.). Pherettma montana, Kinb., subsp. arthuri (Benham). Two specimens. Loc, Henderson Island, S. Pacific (D. Tait coll.). The two specimens agree particularly with Benliam^s description and figures of Peridueta arthuri, Beidi.*. This species is arranged by Beddard t i'l the synonymic list of Ph. montana, Kinb., with a number of other species ; but more recently Ude \ separates them again as a distinct species. I prefer a middle course, and give to Benham's P. arthuri the rank of subspecies only. In a specimen from the above locality the following cha- racters are noticeable : the spermatheca? open to the exterior in intersegmental furrow vii/viii., but lie in the vii. segment; instead of a single median female pore, there are two female pores close to the middle line on the ventral side of the xiv. segment. * Joiirn. Liun. Soc, Zool. xxvi. 1897, p. 212, pi. xvi. fig. 4«, h, t Proc. Zool. Soc. London, 1900, p, 020. X Zeitsclirift f. -wiss. Zool. Ixxxiii. p.
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