1900.] EARTHWORMS OF THE GEXUS AMYNTAS. 621 



16. Amyntas densipapillatus Mich. 



Perichceta densipapillata, Michaelsen, Abh. Senck. nat. Ges. 

 xxiii. p. 227. 



75 mm., 113 segments. Setae 48 on ix., 57 on xix. Numerous 

 papillae in neighbourhood of both male pores and spermathecal 

 pores. Sperm-sacs one pair in xi. ; testes and funnels also one pair 

 (in x.). Spermiilucal glands small, in two segments. Spermathecae 

 very peculiar, pear-shaped, and of a muscular appearance, with, in 

 that of the left side, a small sac distally. 



Hob. Batjan. 



This species is one of the few in which the sexual organs are 

 reduced to one pair. The spermathecae are highly peculiar, and 

 Dr. Michaelsen is inclined to suppose that the main pouch is 

 represented by the small sac, and that the storage of the sperm is 

 undertaken by the muscular duct", the diverticulum being absent. 

 They obviously require further study. Only a single example is 

 known, and therefore it is unnecessary to give an accurate account 

 of those highly variable bodies, the genital papillae, of which, in the 

 single individual, there were 14 pairs and two unpaired. 



I. Spermathecae 1 pair in ix. 



17. Amyntas racemosus Eosa. 



Perichceta racemosa, Eosa, Ann. k.-k. Hofm. Wien, vi. p. 399. 



110 mm., 100 segments. Setae closer ventrally, 46 on segment 

 ix. Spermiducal glands small. Spermathecae with short diver- 

 ticulum, which is divided distally into three to five chambers. 



Hab. Borneo, Java. 



I am not quite certain from Eosa's description where to place 

 this species. He observes that the clitellum extends from the 

 seta-rows of segments xiv. to xvi. But whether this means that 

 the setae are present upon those segments or not, is not quite 

 clear. In any case, it does not seem that this species can be 

 confused with any other. 



(3) Setae totally absent from clitellum ; gizzard-septa usually absent ; 

 no bulbus at end of spermiducal gland-duct. 



A. Spermathecae 6 pairs in iv.-ix. 



18. Amyntas hexatheca Benham. 



PericJiceta hexatheca, Benham, Ann. Nat. Hist. (6) xviii. p. 440. 



138 mm., 74 segments, stout in form. Setae 70 on vi., more 

 than 100 behind clitellum. Papillae on xvii. (2), xix. (3), xx. (3). 

 Spermiducal gland small, with compact structure. First four 

 spermathecae very small. 



Hab. Celebes. 



Only one example of this species has been studied. 

 Proc. Zool. Soc— 1900, No. XL1. 41 



