54 Prof. Eeichert on the Contractile Substance and 



Mr. Hewitson, in his list of Lepidoptera collected by Mr. Wal- 

 lace (Proc. Linn. Soc. viii. pp. 143-149, 1863) has included se- 

 veral different forms as synonyms of C. Leda ; but, as I have not 

 seen types of these insects, I am unable to determine whether or 

 not they are really distinct. I think C. Suyndana may very likely 

 belong to this series, although the colouring of the upperside 

 appears somewhat different. 



XIV. — On the Contractile Substance and Intimate Structure of 

 the Campanularise, Sertularise, and Hydridse. By Professor 

 Reichert *. 



1. In the CampanularicB and SertularicB, as also in other zoo- 

 phytes, we may distinguish, with Allman, two parts : — the true 

 polypes or polype-heads in the asexual or sexual stage of deve- 

 lopment; and the bearer of these polype- heads, the coenosarc of 

 Allman, the substance commune of Van Beneden, and the ccenen- 

 chyma of later authors. The bearer of the polype-heads is a 

 young state of these animals, from which the so-called po- 

 lypes or polype-heads are produced by gemmation; it may 

 be more suitably named the " polype-stem^^ [polypophyton) . 



2. In the CampanularicB and Sertularice examined by me, the 

 polype-stem is always divided into a section serving for the at- 

 tachment of the polypidom, which constitutes the roots, stolons 

 or " rootstock,^^ and the simple or ramified "stalk," which 

 bears the polypes directly either at its extremities or attached to 

 its walls. 



3. On the polype-heads we find, as previously recognized 

 distinguishable parts, the mouth-piece [trompe buccale of Van 

 Beneden) and the stomach {estomac of Van Beneden ; post- 

 huccal cavity, Allman ; cavite post-buccale, Milne-Edwards), 

 with the tentacular apparatus. In the asexual polype-heads of 

 the Campanularim and Sertularics, the " transition-piece " from 

 the stomach to the stalk must also be particularly indicated. 

 In the Campanularice and SertularicB this is situated in the 

 bottom of the bell or cell of the polyparium. In general this 

 division of the bell is separated from the other parts, some- 

 times externally, but more frequently on the inner surface, by 

 an annular or semicircular projection ; so that the *' transition- 

 piece " is placed in a more or less dissepimented cavity of the 

 cell. 



Lister has called the annular process in the Campanularia 

 the diaphragm or the septum. Besides these, two other nar- 

 rowed places are perceptible, situated between the three divi- 



* Translated by W. S. Dallas, F.L.S., from the ' Monatsbericht der 

 Akademie der Wissenschaften zu Berlin/ July 1866, pp. 604-509. 



