DESCRIPTIONS OF GENERA AND SPECIES 183 



Aeolosoma stokesii of Cbagin with ' salmon-coloured nuclei ' is probably either A. quaternarium or 

 A. hemprichii. 



A number of other names, which have been applied to supposed species, will be considered 

 under the descriptions of the species with which they are probably identical. 



(i) Aeolosoma hemprichii, Ehrenbeeg. 



A. hemprichii, Ehrenbeeg, Symb. Phys. 1831. 



A. decorum, 



A. ehrenbergi, Oeested, Naturhist. Tidskr. 1842, p. 135. 



A. balsamoS Maggi, Mem. Soc. Ital. Sci. Nat. 1865, p. 9. 



A. quaternarium, Lankestee, Trans. Linn. Soc. 1867, p. 641. 



Chaetodemus multisetosus, Czeeniavsky, Bull. Soc. Nat. Mogc. 1880, p. 307. 



Definition. Head broader than the following segment. Setae nearly straight ; longer and 

 shorter ones in the same lundle. Integumental glohules orange-red to dark crimson. 

 SujM-aoesophageal ganglion divided posteriori)/ into two hy deep fissure. Nephridia 

 commence in first setigerous segment. Intestine surrounded by a network of capillaries. 

 Localities — England, Europe, N. Africa. 



If all the species which have received the above names are really one, it is clear 

 that, as Vaillant has pointed out, the first of Ehrenbebg's two names has the 

 priority, and that Oeested had no right to introduce the new name ' ehrenbergi.' 

 The synonomy of the species however is difficult. I include A. balsamo in deference 

 to the high authority of Prof. Ve.tdovsky, who was evidently influenced in this 

 identification by the large size of the head as figured by Maggi. In the latter 

 'species,' however, Maggi figures the setae of the lateral bundles as longer and more 

 numerous than those of the ventral bundles. If this character were established it 

 would undoubtedly be of specific value. Lankester's A. quaternariuTn is certainly 

 identical with Vejoovsky's A. ehrenbergi, though it is regarded by Vaillant as 

 synonymous with A. quaternarium of Ehrenbeeg. This is apparently because of 

 the error (?) in Lankester's illustration, which shows the prostomium to be of equal 

 or less diameter than the body. The comparatively large size of the worm, and the 

 presence of nephridia in the first setigerous segment, as well as the form of the setae 

 (straight), and the presence of an intestinal network prove that Lankester's A. 

 quaternarium is wrongly identified by Vaillant. 



' Corrected to 'Balsamoi' by Czerniavsky. 



