348 Diesing. 



65. (167*.) Distomnm tetraeystis GAST ALDI. 



Corpus applanatuni, ovale, antice spinulis minimis armatum. Os 

 oblique terminale. Acetubulum, ore parum majus, apertura circulari. 

 Longit. circa 1/4'". 



Vesiculae quatuor contractiles niicleatae pone aeetabulum sitae, singulae 

 ductii parvo excretorio in os terminantes — Vasoriim trunei principales 

 duo longitudinales intus motu vibratorio instructi, postice in vesiculas 

 duas contractiles, trunco vasali inter sejunctas, tumentes. — Organa 

 genitaiia adliuc nulla. 



Distonia tetraeystis Biagio Gastahli: Cenni sopra aleuni nuovi Eiminti 



Torino 1854. 4. Tab. l. 1 — 3. — Filippi: in Mem. Acad. des sc. de 



Turin 2. Ser. XV. 30. Tab. I. 9. 



Statu larvae: Corpus ^wh^Wi^Wcnm, corpnsculis duobus olivaceis 



supra aeetabulum sitis. Caput aculeo basi dilatato apice subulato 



armatum. Os exiguum acetabuliforme. Aeetabulum subcentrale 



inferum minimum. Cauda flliforniis transverse striata v. crenulata, 



longitudine fere corporis. Porus excretorius .... Longit. corp. 



circa 1/4'". 



Sporocystis iitiieuliformis, decolor 1/17 — 1/4'" longa , larvas 

 caudatas 10 — 40 nee non earum germina includens. 



Cercaria (Acanthoccpliala) microcotyla Filippi. — Diesing : in Sitzungs- 

 ber. d. kais. Akad. d. Wissenseb. XXXI. (i8a8). 253. 

 H a b i t a e u 1 u m. Statu juveuili : Pelopliylax esculentus : inter 

 musculos in vesicula, stratis coticeiitricis transparentibus conflata, in- 

 clusum, Augustae Taurinorum (Gastaldi). 



Statu larvae: Paludhia achatina et P. vivipara: in testicuio 

 et ovariis, in laeu Varese et majore, gregarie (Filippi); in specie 

 ultima cujus in conchae generationis apparatu sporocystides massam 

 albidam caseosam amplam constituunt, Berolini (La Valette) etHei- 

 delbergae (P:igen stech er). 



/3. Aeetabulum sessile, ore minus. 



66.(171.) Distomam rctnsaui DUJARDIN. — Syst. Helm. \. 388. 

 adde : 

 Leidy: in Proceed. Acad. I>bilad. V. 207 et VIII. 44. 

 Habitaculum. Rana halecina: in inlestino tenui, Philadel- 

 phiae (Leidy). 



67. (172.) Distomom eodolobum DUJARDIN. 



Corpus deprcssum obovato-oblongum, antrorsum angustattun, 

 postice obtusum, tolum spinulosum. Os Icrminale oblongum. Äce- 



