QUARTERLY CHRONICLE. 99 



types can be distinguished in regard to the mode of distribu- 

 tion of the sexual individuals, on the polyparies. In the first 

 they are distributed in great number in all the polypigerous 

 region of the polypary, between the sexual individuals. Thus 

 amongst certain Alcyonia, which Professor Kolliker places in 

 the genus Sarcophyton, in the Veretilla, the Lituaria, the 

 Cavcrnularia, and the Sarcobelemmon. In the second case 

 the asexual individuals are restricted to certain places, per- 

 fectly definite, but varying with the genus. Thus, in certain 

 Pterceides they are found on the inferior face of the pennatea 

 leaflets of the region, serving for attachment under the form 

 of a plate of more or less size : in other species of the same 

 genus, they are found besides at the summit of the polypary: 

 in the Pennatulse, the varicosities of the trunk correspond to 

 the place where the sexual individuals are situate ; Fumicuiina 

 quadranyularis exhibits them disposed in longitudinal ranges 

 between the sexual individuals ; whilst the Yirgularise always 

 present behind each leaflet, on their trunk, a simple transverse 

 range of asexual indiAdduals. 



It is probable that all the Pennatulidpe present a like 

 dimorphism, at least among the Renillse polyps may be seen 

 well-developed from secondary bodies, which appear to be 

 individuals of a different form. On the other hand, with the 

 exception cited above of the genus Sarcophyton, Professor 

 Kolliker has sought in vain for dimorphism among the Alcyo- 

 iiidte and the Gorgouidse. It must not be forgotten, too, 

 that there appear to exist relations between the buds of the 

 sexual and asexual individuals in the polymorphic polyparies, 

 for in the Veretilla at any rate, the asexual individuals 

 appear to be able under certain circumstances to transform 

 themselves into sexual individuals. Professor Kolliker has 

 also studied a polypary of Tubipora still enveloped in its soft 

 parts, and coming from the Yiti archipelago. In spite of the 

 great resemblance between the polyparies of Tubipora3, and 

 those of the madrepores, the author has convinced himself 

 that by all their structure and their development these 

 polyps are Alcyonaria which ought to take place by the side 

 of the genus Clavularia. Both the tentacles and the bodies 

 of the polyps of Tubiporai contain spicules. 



" On an Hermaphrodite Nemertine from Saint-Maloj" by 

 Professor Willi. Keferstein. — Formerly a great importance 

 Avas assigned in zoology to the union of the sexes in the same 

 individual, or to their separation in distinct individuals. 

 Even recently a French savant has tried to class the inverte- 

 brata in great measure by this character. It is certain, how- 

 ever, to-day that the raonoecia and the dioecia have only a 



