1900.] EAETHWORHS OF THE " SKEAT EXPEDITION." 895 



muscular duct. The diverticulum is short, barely one-third of the 

 length of the sac. 



Hab. Aring. 



The following is the abstracted definition of 



Amyntas malayanus, n. sp. 



Length 14-1 mm. ; number of segments 105. Setae of anterior 

 segments not enlarged. Clitellum xiv.-xvi., with setae. Genital 

 papillae paired on xviii.-xxi. Male pores far apart. Septum viii./ix. 

 present. Caeca present. Last hearts in xiii. Sperm-sacs in xi., 

 xii. Spermiducal glands in xvii.-xix., with horseshoe-shaped duct 

 and no terminal sac. Spermathecae in vi.-ix., with shortish diver- 

 ticulum. 



Hab. Malay Peninsida. 



(6) Amyntas virgo, n. sp. 



I have examined seven and dissected four fully mature examples 

 of this species, whose characters do not fit in with those of any 

 other species that has been adequately described. 



The largest individual, which, however, like the others, is 

 somewhat softened in the clitellar region, measures 152 mm. 



The seta upon the anterior segments are rather larger than upon 

 the following segments. 



The clitellum, which occupies the usual segments, has no setae. 



The male pores are very conspicuous and quite far apart. 



There are no genital papillae. 



The gizzard-septum is wanting ; two septa following the gizzard 

 are of considerable thick uess. 



The usual paired aeca are present. 



The last heart is in segment xiii. 



The remarkable feature about this species which at once differ- 

 entiates it from A. impudens l and A. pliilippinus 2 — the only two 

 that could be confused with it by reason of their possessing a 

 terminal sac to the spermiducal-gland duct, no setae upon the 

 clitellum, and 3 pairs of spermathecae in vii.-ix. — is the very small 

 size of all the parts of the generative apparatus. In this the 

 present species resembles A. taprobance. 



The sperm-sacs are small and lie in segments xi., xii. ; they do 

 not reach as far as to the dorsal surface of the intestine. 



The spermiducal [/lands vary in size, but are small and confined 

 to their segment. The short duct leads into the circular eud-sac. 



The spermathecae are so small that they might be readily over- 

 looked ; and yet the external apertures are quite large and 

 conspicuous. Each pouch has a diverticulum of about the same 

 shape and size, especially resembling in this A. taprobance. The 

 spermathecae lie in segments vii., viii., ix., and open between 

 vi./vii., &c. 



Hab. Paddy-fields, Tale. 



1 Michaelsen, JB. Hainb. wiss. Anst. xvi. p. 84. 



2 Bosa, Ann. Hofni. Wien, vi. p. 397. 



