10 Dr. R. Grceff on the Annelid Genus Sphserodorum. 



of these appendages, v/liicli are placed at regular intervals, and 

 form a transverse row upon the back and another on the belly. 

 Between the large cutaneous appendages there are numerous 

 small ones irregularly scattered over the body. Feet simple, 

 containing a bundle of composite setae. 



1. SpJiarodorum flavum, CErst. 



Annulat. Danicor. Conspectus, fasc. i. p. 43, pi. 1. fig. 5, pi. G. figs. 92, 101. 

 Archiv flir Natiu-g. 1844, i. p. 108. 



Corpore ]|" longo, |"' lato, teretiusculo, flavescente, utrinque 

 fere sequaliter attenuate, segmentis 150, duplo latioribus 

 quam lougis, papillarum 12-16 in margine anteriore capitis, 

 duabus paulo longioribus; oculis quatuor quadratum forman- 

 tibus ; pinnis abbreviatis, 7-8-fidis, setis 5-7 uncinatis. 



The preceding character of CErsted's species must certainly 

 undergo some alterations in accordance with the above observa- 

 tions. As, however, S. flctvum does not appear to have been 

 observed by any one since (Erstcd, I leave his description unal- 

 tered for the present. It is possible, moreover, that there is no 

 specific difference between S. Jlavimi and S, peripatus. 



2. Spharodorum peripatus, Grube. 



(Die Familien tier Anueliden, p. G"] .) 



Pollicita peripalus, Johnston, Ann. Nat. Hist. vol. xvi. p. 5, pi. 2. figs. 1 (5. 



Sp/icerodorum peripatus is the species investigated by Clapa- 

 rcde and Kolliker, as has already been repeatedly stated. 



3. Spharadorum Clapuredii, sp. n. PI. I. 



I venture to name the new species described in detail in this 

 paper after the indefatigable observer who has done so much for 

 the natural history of the Annelida. 



EXPLANATION OF PLATE L 



Fi(j. 1. Sph(srodorum Claparedii, magnified about 40 diameters. 



Fig. 2. Foot with the bundle of composite uncini, magnified 300 diameters. 



Figs. 3-9. Developmental stages of the glandular appendages, magnified 



about 600 diameters. 

 Figs. 10-14. Developed glandular capsules with the tubes contained in 



them, and opening externally by a fine orifice in the wall of the 



capsule ; magnified about 600 diameters. 



