CHINESE EARTHWORMS GATES 437 



PHERETIMA GRAHAMI Gates 



1935. Pheretima grahami Gates, Smithsonian Misc. Coll., vol. 93, no. 3, p. 9 



(type locality: Da Shiang Lin Pass, Szechwan ; types in the U. S. 

 National Museum). 



1936. Pheretima grahami Chen, Contr. Biol. Lab. Sci. Soc. China, zool. ser., vol. 



11, p. 298 (after examination of types). 



■ Material examined. — From Dr. Graham : 1 clitellate specimen la- 

 beled "Da Shiang Lin Pass, 7,000 feet, August 29, 1928"; 1 clitellate 

 specimen labeled "Ningj-uenfu, 7,000 feet, July 1928." 



Exteriml characteristics. — Length, 235-285 mm. Diameter, 11-15 

 mm. 



The setae begin on ii, on which segment there is a complete circle. 

 There are no definite midventral gaps in the setal circles; middorsal 

 gaps may be present but are of variable width. Setal numbers; 

 vii/22-25, viii/22-27, xvii/10(+ ?)-26, xviii/10(+ ?)-19, xix/19 

 ( + ?)-25, xx/80-91. (The first number of each pair is from the speci- 

 men with the first dorsal pore on 13/14.) 



The first dorsal pore is on 12/13 or 13/14. 



The clitellum is annular and extends from 13/14 to 16/17 ; interseg- 

 mental furrows and dorsal pores lacking on one specimen, slight ves- 

 tiges of both on the other specimen. Setae are present, at least mid- 

 ventrally, on xiv-xvi of one specimen ; lacking on the other. 



The secondary spermathecal pores are widely separated; three 

 pairs, on 6/7-8/9. Each pore is a wide transverse slit ; the margin of 

 the slit finely lobulated. On separating the margins of an aperture 

 a deep invagination passing posteriorly (never anteriorly) into vii 

 or viii or ix becomes visible. On the median wall of the invagination 

 there is a finely lobulated ridge. On the roof of the invagination 

 there is a large, oval, genital marking, a portion of which may be 

 visible from the exterior if the margins of the aperture are pulled 

 sufficiently apart. The wall of the spermathecal invagination is ex- 

 tensively and finely wrinkled or furrowed, sometimes with an appear- 

 ance of cross-hatching. 



The apertures of the copulatory chambers are somewhat irregular 

 but approximately transversely slitlike. There is no lateral lip ; the 

 body wall just lateral to the aperture thick. 



Genital markings are lacking externally. 



Internal anatomy. — Septa 5/6-7/8 are thickly muscular; 8/9-9/10, 

 lacking; 10/11-12/13, thickly muscular; 13/14, muscular. 



The intestine begins in xv. The intestinal caeca are simple; the 

 dorsal and ventral margins without incisions ; or the ventral margin 

 may be incised in such a way as to form 4-6 widely separated, ven- 

 trally directed, short fingerlike lobes. On the esophagus just behind 

 the gizzard there is a conspicuous, lobed, reddish, glandular collar. 



8234r — 39 3 



