18 ARKIV FÖR ZOOLOGI. BAND 7. N:0 5. 



wards from the first septum, pass through apertures in the 

 second septum and terminate immediately in front of the 

 third septum; a pair of statocysts, closed oval sacs, each 

 €ontaining a single large, oval, secreted statolith. 



Tyjpe specimen in the Riksmuseum, Stockholm. The type 

 specimen was collected at Port Natal, Durban. The species 

 is now recorded from Saldanha Bay, Cape Colony, collected 

 by Professor J. D. F. Gilchrist. These are the only records 

 of the capture of this species. 



Åffiuities of Arenicola loveni Kixberg. 



The affinities of this species with other caudate species 

 of the genus may now be determined. There are so few feat- 

 iires in which A. loveni agrees with A. claparedii Levinsen, 

 A. assimilis Ehlers (and its variety affinis Ashworth) and 

 A. glacialis Murdoch, that we may conclude that Kinberg's 

 species is not nearly related to any of these. A. loveni has 

 oertain features in common with A. marina (Linn^us) and 

 A. cristata Stimpson, for instance, elongate neuropodia and 

 a single pair of oesophageal glands; in these, three species a 

 pinnate type of gill occurs, though in most examples of A. 

 marina, that is, in the littoral variety, the gill is bushy, the 

 pinnate type of gill being found only in examples from the 

 lower tidal zone, that is, in the Laminarian variety. A. loveni 

 and A. marina also agree in regard to the number of their 

 segments and gills but they differ in the number of their 

 nephridia and the nature of their septal pouches, statocysts 

 and statoliths. Important points of agreement (besides those 

 named above) between A. loveni and A. cristata, are presented 

 by their closed statocyst and single statolith and by their pro- 

 stomium; moreover, the septal pouches of A. cristata, while not 

 nearly so large as those of A. loveni, more nearly approach 

 the latter in size than do those of any other species. In the 

 €haracters of its setae, both notopodial and neuropodial, A. 

 loveni presents a closer approach to A. cristata than to any 

 other species. The chief differences between A. loveni and 

 A. cristata are in regard to the number of segments (nineteen 

 and seventeen respectively), gills (thirteen and eleven pairs 

 respectively) and nephridia (five and six pairs respectively). 



