264 76 



that my statement that the two forms could not be distinguished from each other, was 

 wrong. From the combined investigations of Wierzejski, Lange and Powers, I am 

 sure tliat I liave been wrong in my supposition. The chief reason for that was, that 

 in my pond, I did not at that period see any of the saccate forms, and secondly, 

 that V. Daday had not mentioned that the humped forms, when the humps were 

 drawn in, were indistinguishable from the saccate ones. 



I regret very mucli that I have not been able to find the species again in time 

 and so complete my observations. When ('"/s 1920) I found the new locality (Fjennes- 

 lev) it was most probably too late in the year to get the saccate form, and the pond 

 was so far away from my laboratory that regular proofs could not be obtained. 



Asplanchna intermedia Hudson. 



Male: Hudson-Gosse. Supp. 1889, p. 12. 

 Rousselet 1901a, p. 9. 

 Daday 1891, p. 87. 



HuDSON-GossE (Supp. 1889, p. 12, PL XXXII, fig. 15). 



"The contractile vesicle and sperm-sac of the male are very small; and the lateral 

 canals have the vibratile tags arranged in a straight line on either side. The creature is so 

 wonderfully transparent and empty that it is difficult to see . . . The hind dorsal corner of the 

 body is somewhat prolonged into a sort of third hump, and darts out stiff and obvious (as 

 do the lateral arms) when the head is retracted. The opposite ventral corner is prolonged to 

 a blunt point, and is the sheath of a long protriisile penis. What appears to be an atrophied 

 oesophagus and stomach hangs freely in the body-cavity, between the liead and the above- 

 named dorsal hump. In one specimen I saw tags in which no ciliary motion was visible. 

 Length m. ^^ i." 



Rousselet (1901a, p. 9, PI. I, fig. 2). 



The males of A. intermedia and A. amphora resemble each other very much; both have 

 two humps, projecting laterally on the sides of the body, onlj' the male of A. intermedia is 

 much smaller than that of A. amphora. 



v. Daday (1891, p. 87) only says: 



"Körper conisch, mit zwei Seiten- und einem Ruckenanhang; mit einem einzigen Stirnauge." 



Asplanchna amphora Hudson. 



Male: Hudson 1889 Supp. p. 13. 

 Powers 1912, p. 441. 

 Western 1890, p. 65. 

 Daday 1891, p. 85. 

 Tab. VlI, flg. 4. 



Western (1890, p. 65) remarks that he has observed 



that as the females grow larger and older the lateral humps almost, if not entirely, disappear. 

 Among these large apparent!}' humpless females he has however found two large humpless 

 females with young ones in utero, which were undoubtedly of the humped varietj'. He has 



