220 



32 



Triphylus have been described and figured ; those of Cyrtonia, Triphylus and Notom- 

 mata only a single time and very insufficiently. On the other side Weber"s des- 

 criptions of Diglena catellina, Diglena forcipata and Copeus labiatus and 

 further Rothert's and Rousselet's descriptions of Proales Wernecki 

 belong to the best descriptions hitherto known of males of Rotifers. 



Cyrtonia tuba (Ehrbg.) 

 Male: Rousselet 1894 p. 433. 

 RoDSSELET (1894. p. 433. PI. XX, fig. 4) describes the male as 

 follows. 



The male of Cyrtonia tuba is a small elongated, cone-shaped creature 

 \s-ith only a sUght indication of being humped, and otherwise quite straight, 

 ha\'ing a simple ciliarj' wreath, a prominent red e\'e, dorsal and lateral antennæ, 

 a contractile vesicle and two small toes. The jaws and aUmentaiy canal are Cyrtonia tuba 

 quite absent, the elongated sperm sac filling the whole bodj' cavity. The usual ö (Ehrbg.; 

 longitudinal muscular bands, which are striated, are present, and the circular after Rousselet. 

 bands are more apparent tlian is generally the case. The two small toes are 

 conical and have the usual foot glands. Size of female -'s inch to ijs inch; of male cijj. Time: 

 June — August. 



Proales Wernecki Erhbg. 



Male: Rothert 1896 p. 702. 



Rousselet 1897 d p. 415. 



In 1896 Rothert described the male but gave no drawing of 



it: next year Rousselet found the male again and gave a new de- 

 scription and two figures. In the following I have tried to combine 

 the two descriptions. 



The male is of much the same appearance as the female; this espe- 

 cially holds good with regard to the form of the body, foot and wheel-organ. 

 It differs from almost all other male rotifers in having a well-developed 

 ahmentary canal. It has a niastax of a structure almost quite like the fe- 

 male. The jaws are like those of the female. All the usual parts are well 

 developed, and, in addition, there is a small triangular plate on each side 

 articulated between the ramus and uncus. There is a well-defined oesophagus 

 and small salivary glands. The stomach is also present, but takes up a very 

 small portion of the body cavity; an intestine cannot be seen. The gastric 

 glands are only small, much smaller than those of the female. There is a 

 large testis but no prostata gland; the spermsac opens as usual into a penis 

 on the back of the foot. The brain and the red ej'e correspond with those 

 of the female. The excreton,' organ is only insufficiently observed; there 

 seems to be no contractile vesicle. The toes and foot glands are large. A 

 dorsal antenna but no lateral antennæ are observed. 



The males are found swimming in the water; in form and structure 

 they are verj' like the ^^oung females but differ strongly from the old, stout, 

 almost globular females found in the gaUs. Size of male 149.", of j'oung 

 female 159«, of adult female 195". Time: according to Rothert, December, 

 according to Rousselet, April. 



Proales Wernecki 



(J Ehrbg. after 



Rousselet. 



I 



