oligochjeta. Venn. 31 
Anteus gig ns , Perrier, not identical with Microchmta rappi , pp. 77-82 ; 
Horst (1 ). 
Eudrilus jullienij Horst, = (E. lacazei, peregrinus, decipiens, and boyeri , 
Perrier) ; id. (5). 
Eudriloides gypsatus, Mich. ; Michaelsen, (2) pp. 7-10. 
Fletcherodrilus unicus — ( Cryptodrilus unicus , Fletch., C.- purpureus, 
Mich., and G. fasciatus , Fletch.) ; id. (1) pp. 31 & 32. 
Iletcrochceta costata , Clap., 18G3 ; Beniiam, (4) pp. 188-206. 
Lumbricus rubescens — ( Omilurus rubescens ), Temp. ; Friend. 
Mcgctscolcx cmruleus , Templeton, = (Pleurochceta moseleyi , Beddard) ; 
Bourne (1). 
Microscolex dubius , Fletch., Minorca ; Michaelsen, (1) pp. 19 & 20. 
Moniligaster barwelli , Beddard (9). 
Paranais littoralis , O. F. Miiller ; Bourne, (2) pp. 349-352. 
Sph'osperma ferox , Eisen ; Beniiam (4). 
Stuhlmannia variabilis , Mich. ; Michaelsen, (2) pp. 23-28. 
Histology, Physiology. 
Beniiam (1). Cuenot, pp. 447-458. Griffiths, p. 294. Leniiossek 
(1, 2). 
Distribution, Biology, Teratology. 
Barrois. Beddard (10, 11). Benham (3, 4). Collin (3). 
Morphology. 
Beddard (3, 4) finds that in Libyodrilus violaceus the nephridial system 
consists of paired nephridia, which do not open immediately to the 
exterior, but are connected with an extensively ramifying system of tubes 
imbedded in the circular and longitudinal muscles. They consist of four 
principal longitudinal trunks, continuous from segment to segment, and 
of a singular large circular vessel in each segment, passing right round 
the worm at the junction of the circular and longitudinal muscles ; these 
are connected by a plexus of vessels, and numerous tubules leading to 
the exterior are given off from each circular trunk. In some of the 
genital segments the paired nephridia have almost disappeared, leaving 
only the integumental network. In the young worm just escaped from 
the cocoon there is no integumental network, which must, therefore, be 
regarded as secondary ; but the anterior nephridia, at any rate, are con- 
nected on each side by a continuous longitudinal duct lying within the 
coelom. Author is more inclined to compare this system to the nephri- 
dial system of Cestoda , &c., rather than to the intracoelomic network of 
those Oligockccta which possess a diffuse nephridial system ( Perichazta ). 
Benham (1) finds that in the aperture of the funnel of the nephridium 
of Lumbricus the space between the central ends of the marginal cells 
and the grooved or so-called gutter cells of the funnel, is occupied by 
one large crescent-shaped cell. With reference to Bourne’s theory of the 
