Studie o Coccidech. 17 



the ventral peripheric zone; they are to be callecl papillary ducts 

 (Tab. 2. fig. 4 b). 



4**^ At last we can find on the ventral side 10 — 15 simple aper- 

 tures of small tubes without external pieces, which are identical in 

 shape with ducttubes running into the fringed ducts ; their name will 

 be simple ducts (Tab. 2. fig. 4 a). 



This enumeration of the diíferent forms of the ducts gives us an 

 idea of the morphological developenient of those organs, which are 

 to be reduced to the simple ducts, which were on higher degrees 

 improved by the external pieces, making the waxmatter to fiow out 

 in some distance froni the body. The primary opening was multiplied 

 in the serrated ducts. 



We shall return to the description now again. 



On the foUowing segments we observe these characters: 



prothorax: on its periphery there stands one great hair, 4 — 7 

 little ones ventrally in the peripheric zone, which are scattered 

 among 3 — 5 papillary ducts, aud 11 — 16 openings of the small cylin- 

 drical ducts; both open' without exception on the ventral side. 



Mesothorax: one hair on the periphery, 2—4 little ones on the 

 dorsal side; 2—5 papillar ducts, 11 — 20 small cylinders, both ope- 

 ning ventrally, 



Metathorax: 2 peripheric hairs. one dorsal, one ventral; 1 — 3 

 papillary ducts, 9 — 12 (in one čase 16) cylindrical ducts, which are 

 here already growing ; their mouth is mostly on the ventral side, yet 

 we may sometimes find 1 — 2 on the periphery. 



In some instances I háve found on mesothorax and metathorax 

 1 — 2 simple ducts opening ventrally in the peripheric zone. 



Two pairs of stigmata; one on the prothorax cephalad with a 

 group of 2 — 3 spinnerets (each with 6 small circular openings and 

 thickened boder) of the samé shape as the spinnerets on the telson; 

 the second pair is on the metathorax without any spinnerets. 



On the first abdominal segment the cylindrical ducts, are pus- 

 hed nearer to the periphery (3 — 5) and dorsum (2 — 10) except 2 or 

 3, which still open ventrally; on the ventral side open generally 3 

 papillar and on the periphery one transitory duet. 



On the other abdominal segments is following disposition of the 

 hairs and ducts: 



On the 2""^ abdominal segment: no papillar duet, 2 — 6 tran- 

 sitory ducts, 1 — 3 fringed ducts, 3 — 6 peripheric, 8 — 17 dorsal cy- 

 linders. 



Tř. mathematicko-přírodovědecká. 1895. 2 



