ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 995 



is of no value for generic, though it may be so for specific, distinc- 

 tions ; and he proposes to divide the family thus : — 



" I. Those which have a double arrangement of part of the trochal 



cilia of a distinctly rotulate character. 

 II. Those which have this double rotulate part suppressed or 

 aborted : — Gallidina Ehrbg." 

 The first group the author subdivides thus : — 

 " 1. Those with four toes: — Pliilodina. 

 2. Those with three toes : — 



(«) Having the pre-intestinal part decidedly shorter than the 

 post-intestinal or post-anal part : — ■ 

 Rotifer, Actinurus. 

 (b) Having the pre-intestinal part decidedly longer than the 

 post-anal part : — 



Callidina, Macrotrachela n.g." 

 A description is given of these genera, together with that of some of 

 the species. Of Macrotrachela none of the species have eye-spots, though 

 3L constricta (Dujardin's Callidina constricta) has two green vesicles 

 in the position of the eye-spots of other forms. Six other species of 

 this genus are described. In Callidina Ehrbg. " the aborted wheels are 

 represented by two wrinkled membranes " within the collar. Two new 

 species are described : one, referred doubtfully to the genus Diglena as 

 JD. uncinate/,, resembles Theorus uncinafus in the presence of two large 

 glands by the stomacb, containing each a large vesicle surrounded by 

 granules. In Stephanops stylatus there is a strong style on each side 

 of the buccal region, and at the base a green mass, which is the only 

 representative of an eye-spot. 



Affinities of Balanoglossus.* — M. E. Kohler, who rejects the idea 

 of any relationship between Balanoglossus and the Echinodermata, 

 offers the following scheme of affinity between the Vermes, Proto- 

 chordata, and various groups of the Chordata. 



Vermes 



Protochordata 



I 



First Vertebrates 



Balanoglossus 

 Cyclostomata / 

 Amphioxus 



Tunicata Vertebrata. 



* Zool. Anzeig., ix. (1886) pp. 506-7. 



3 T 2 



