INVERTEBBATA, CRYPTOGAMIA, MICROSCOPY, ETC. 85 



brings forward evidence to show that this is the case ; that, in fact, 

 the simple seta has been formed by this fusion of the terminal segment 

 of the compound seta with its stem. 



In a second j)aper, with the same title,* Langerhans gives detailed 

 descriptions of genera and species of Aphroditidfe, Amphinomidse, 

 Palmyridte, Lycoridte, EunicidaB, Glyceridte, Nephthydeae, Hesionidae, 

 Phyllodocidae, and Alciopidas. 



Branched Syllis.f— Dr. Mcintosh notes a remarkable branched 

 Syllis (S. ramosa), which was found in a Hexactiuellid sponge 

 dredged near Zebu by the officers of the ' Challenger ' Expedition ; 

 the tangled masses made up by various portions are rarely found to 

 j)resent any head, although, of course, such must be present. The 

 body of the animal is made up of a number of narrow segments, which 

 are provided with laterally set feet ; the setfe appear to be remark- 

 able from the fact that their dilated distal portion has a simple terminal 

 process ankylosed to it. Budding ajjiiears to take place on any and 

 every occasion, laterally, or terminally, or wherever the surface is 

 broken. It is remarkable that the number of buds seems to be 

 indefinite. 



As the paper is in English, and is very brief, we need not detail the 

 account of tbe two female buds which the author observed. It is to 

 be hoj)ed that it will not be long before figures are published in 

 illustration. 



Organization of Echiurus Pallasii.l — Di'- Spengel finds that the 

 integument of this form consists of a thick cuticle of an epithelial 

 layer formed of cubical cells, and of a subjacent connective tissue. 

 Unicellular glands form groups of varying size and are regularly 

 arranged on the trunk, while they are also found on the dorsal side of 

 the so-called proboscis. The coelom is lined by a layer of flattened 

 cells attached to the dermo-muscular tube, and continued on to all 

 the organs which are placed in the ccelom. This latter, which extends 

 even into the proboscis, is filled with a fluid in which not only are there 

 cells with pale processes and brownish pigment-corpuscles, but also 

 generative j^roducts. 



The nervous system is formed by a ventral cord, which is almost 

 completely circular, and forms a wide commissural ring ; the ganglio- 

 nic cells form two continuous bands on either side. Near the dorsal 

 surface of the cord there is, in the middle line, a canal-like cavity, 

 which is always found filled with a coagulum ; first seen by Grceflf, it 

 may be compared to the axial canal or neural canal of other Anne- 

 lidcs. 



The pouches of the ventral setfc are stated to have an external 

 investment of muscular and connective tissue and to be lined inter- 

 nally by epithelium. Tlie cells at the base are the largest in size, and 

 are the only parts which give rise to the setno. The enteric tract is 

 of a considerable length and is greatly coiled; there is an ODSopbagus, the 



* 'Zcitsoh. wiss. Zonl.,' xxxiii. (187^ p. 267. 

 t ' Joiiru. Linn. Soc. (Zool.),' xiv. (1879) p. 720. 

 X 'Zool. Anzcigcr,' ii. (187'.)) p. .542. 



