1900.] BAHTHWOEMS OF THE GEKUS AMYNTAS. 631 



imparicystis) agrees with A. jampeanus, as described by Benharu, 

 in size: the extremes are different, viz. 130 <fc 420 mm.; but the 

 following measurements unite these extremes to some extent: — 170, 

 220 of halmaherce, and 370, 280, 240, & 225 of jampeanus. The 

 genital papilla? differ enormously in the varieties of halmaherce : 

 in one there are but a single pair on xvii., at the other extreme 

 we have something like twelve pairs in the neighbourhood of the 

 spermathecal orifices and eleven pairs posteriorly. 



.From this to A. jampeanus with no papilla? is not a wide jump ; 

 and it must be remembered that Ben ham described only three 

 examples of the species. In any case P. bonthainensis has rows of 

 three such papillae on xvii., xix., xx. The number of seta? is 

 certainly smaller in the typical halmaherce from what is found in 

 the typical jampeanus, i. e. 80 onxxv. to 130 on the same segment. 

 But this discrepancy is reduced in significance by Dr. Michaelsen's 

 description of a variety of jampeanus in which that segment had 

 but 86. To this and to another variety the names of tigrina and 

 fumigata were given by Michaelsen. In all of these forms the 

 male pores are more closely approximated than is the rule in 

 Amyntas. A difference shown by digitata is the "digitate" 

 condition of the caeca. But this is shown to nearly the same extent 

 in halmaherce. In the former, again, the spermiducal glands are 

 small, and actually confined to the xviiith segment. We find, how- 

 ever, here again a series of stages : in specimens of bonthainensis 

 examined by Michaelsen those glands only occupied two segments ; 

 the rule for the species, as it appears, is for them to fill three 

 segments. It would seem at first sight more unreasonable to 

 include the small species A. purpureus. The species is as small 

 as 72 mm. in length, which contrasts with the 420 mm. of A, jam- 

 peanus. But the largest individual of purpurea described by Dr. 

 Benham measures 95 mm., which is after all not so great a 

 difference from the smallest of halmaherce. I include it in the 

 present form in agreement with Dr. Michaelsen, who however did 

 not actually place the name as a synonym of the rest. The male 

 pores are close together as in the other varieties. The seta? are 

 however fewer, not more than 70 upon the xxvth segment. That 

 the diverticulum of the spermatheca is straight and not coiled does 

 not appear to me to be at all a valid distinction. 



48. Amyntas aspergillum Perrier. 



Perichata aspergillum, Perrier, Nouv. Arch. Mus. Paris, viii. 

 p. 118. 



Perichata aspergillum, Rosa, Ann. k.-k. Hofm. Wien, vi. p. 403. 



Amyntas aspergillum, Michaelsen, Jahrb. Hamb. wiss. Aust. xvi. 

 p. 10. 



Perichceta takatorii, Goto & Hatai, Ann. Zool. Japon. ii. p. 76. 



Megascolex aspergillum, Vaillant, Anneles, 1889, p. 76. 



180-375 mm., 150 segments. Seta? 48 on v., 97 on xxvi. Setae 

 ornamented, ventral larger than dorsal on many segments. Male 

 pores surrounded by ten papillary pores; spermathecal apertures 



