L. Stieda on the Taeniae. 101 



2. Lingula smaragdina, A. Adams. 



L. testa oblonga, lateribus rectiusculis, ad umbones attenuata, ad 

 marginem ventralem subtruncata; carina dorsali valida, promi- 

 nente; glabra, nitente, viridisshna. 



Hab. Yobuko ; 10 fathoms, mud. 



A bright green species, found also in the China Sea, and most 

 nearly resembling L. hirundo, Reeve. 



3. Lingula jaspidea, A. Adams. 



L. testa oblongo-ovali, lateribus convexis, ad umbones subdilatata; 

 margine ventrali arcuato ; carina dorsali rnediocri, subdepressa ; 

 glabra, nitente, subviridi-lutescente, antice pallidiore, rufo-fusco 

 tincta. 



Hab. Mososeki; 7 fathoms, mud. 



4. Lingula lepidula, A. Adams. 



L. testa oblongo-ovali, umbonibus acutis, productis, lateribus con- 

 vexis, dilatatis, membranaceis ; margine ventrali rotundato ; carina 

 dorsali depressa ; glabra, nitente, luteo-cornea, in medio albida. 



Hab. Seto-Uchi (Akasi) ; 10 fathoms, mud. 



A species as small as L. semen, and shaped like L. ovalis. 



XV. — A Contribution to the Knowledge of the Taeniae. 

 By Ltjdwig Stieda*. 



Of the numerous Cestodea forming the group of the Tcenioidea, 

 scarcely any except the cystic Tcenice have hitherto been particu- 

 larly investigated in respect to the generative organs, the other 

 Tcenice having received little attention. The different forms, 

 however, as has already been shown by Pagenstecher's descrip- 

 tion of the several organs of Tcenia microsomal, present very 

 peculiar structures, differing in many parts from the arrange- 

 ment of the sexual organs occurring in the cystic Teenies; and 

 these are of more importance inasmuch as the different structure 

 of the generative organs will enable us to found a more certain 

 and natural classification of the innumerable Tcenioidea than has 

 hitherto been possible. For this reason I hope that the present 

 short communication, in which I have endeavoured to describe 

 the generative organs of certain Tcenice, some of them unknown, 

 others imperfectly known, will not be entirely destitute of in- 

 terest. 



In the small intestine of the Field-Mouse [Hyp-adeem arvalis) 



* Translated by W. S. Dallas, F.L.S., from Wiegmann's Archiv, 1862, 

 p. 200. 



f Zeitschr. fur wiss. Zool. ix. p. 523. 



