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Show 1900.] EARTHWORMS OF THE GENUS 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 aud spermathecal pores. Sperm-sacs one pair in xi.; testes and funnels also one pair (in x.). Spermiducal glands small, in two segments. Spermathecae very peculiar, pear-shaped, and of a muscular appearauce, with, in that of the left side, a small sac distally. Hab. 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 sperui 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. 1. Spermathecae 1 pair hi 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 diverticulum, which is divided distally into three to five chambers. Hab. Borneo, Java. I am not quite certain from Bosa'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) Setce totally absent from clitellum ; gizzard-septa usually no bulbus at end of spermiducal gland-duct. A. Spermathecae 6 pairs in iv.-ix. 18. Amyntas hexatheca Benham. Perichceta 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. P R O C ZOOL. Soc-1900, No. XLI. 41 |