99 



287 



referred to a special family. As far as I can see an anus is wanting, as well in the 

 Ascomorphidœ as in Anapodidœ; characteristic of both is a thick fleshy antenna, 

 situated on the disc of the wheel-organ. 



I hope I shall later on be able to return to these very interesting and but 

 slightly studied animals. The males are almost quite unknown. Of A. (= Sacculus) 

 uiridis Gossk (1856, p. 320, PI. XV, fig. 26) has given a small but rather good 

 drawing of the male: He only says: "I could not detect any eye, nor any internal 

 organization; nothing but a confused assemblage of granules and globules; even 

 the ordinary opaque masses were not present. The form somewhat resembled that 

 of an amphora with a short wide neck; the frontal cilia were very large, but the 

 motion was not rapid, nor was the animal wild as male Rotifera usually are. Fe- 

 male iItj in., male ^^-p in. 



I have often had females with male eggs and hatched the males; these com- 

 monly appear in spring; the males are extremely small; I have always failed in 

 getting a good drawing of them. Tab. XIV, fig. 4 gives a little sketch of the animal. 



Pterodinidæ. 



The family comprises the two genera: Pterodina and Pompholyx; the males of 

 the genus Pompholyx have hitherto been uulinown; of the genus Pterodina only Rous- 

 SELET and Marks & Wesché have described the males. 



Pterodina elliptica Ehrbg. 



Male: Kousselet 1898, p. 27. 



RoussELET (1898, p. 27, PI. IV, fig. 4 e, f.) writes. 



"In outline it is very narrow, elongated, and quite unlike tlie female. It has a decided, 

 but rather soft, lorica and two red eyes in front, but is devoid of jaws. The copulatory organ 

 projects dorsally above tlie foot, which is of usual structure 

 and ciliated at the end. Size of male 127 /u, of female 136 /«." 



Wi-BER (1898, p. 653) only states 



that the male has been observed by several naturalists. 



Pterodina patina Ehrbg. 

 Male: :\Iarks & Wesché 1903, p. 509. 



The Male has been observed by Marks & Wesché 

 (1903 p. 509, PI. 26, fig. 3). 



"Seen laterally, rather vermiform, resembling a young 

 Proales petromyzon. Dorsally, somewhat broad, bat having no 

 approximation to the plate shape of the female. Head, rather 

 short, without quasi-auricles as in female; constriction of neck 

 not well marked. Body, rather broad, but fairly long; edge of 

 carapace visible laterally, and two folds on the posterior sides, 

 when viewed dorsally. The two muscles, so prominent in the 

 female, and used to retract the head, are present and well 

 marked, and best seen on the dorsal view. Foot, short, stout, retractile, with a gland at the 

 extremity. Toes, none. Cilia, moderately long. Brain, large, occupying all the heatl and sending 



38* 



Pterodina elliptica çf 

 after Rousselet. 



