Volume II, December, 1889. Number 3, 
JOURNAL 
OF 
MORPHOLOGY. 
THE EMBRYOLOGY OF THE EARTHWORM. 
EDMUND B. WILSON. 
CONTENTS. 
PaRT I. oak 
Te LOGUCHON 4c cis cic otlalsiae clniters's ctv wate cece cccceue feline eietaielays 388 
Part II. 
TY. Ege-laying, Ct. ois 0.s'ses cisec's cais's nlnimls mii sle'e sin wicieiaise sisicinis's s Seow, lel! 
III. Cleavage of the ovum and origin of the layers ........+.2.seeeseeeee 396 
MiVare Gastrulation is.) <cre -s-retate'sts)Notataohelateve) si vansletaletay shelelsialelevalelel ein aietele loci sedate 399 
V. General history of the germ-bands ........sseeee cece ere eee rene eees 401 
Kee Dive) Mes blast. ccc sineintere) sisieiereie ater cle a) stoeiverdlaveletakere(olarteie(aislalele 401 
Dor HevectOblast: .«:cfterajelvieha/otereyetalevsteyolereteratstolet-ekalelel=iaia iat s{-/=tskeliate 401 
3. Larval execretory Organs ......... eee e eee e eee c eee eeeeeeeees 401 
4. Middle stratum 2... 2... ccc sceeccec cern nccenscseencscccee 402 
5. The teloblasts .........sceeee seer erer cece eneteeeescenaees 403 
VI. General history of the mesoblast .......ccceesessececcccceseveceoes 404. 
Be General: CierentiallOn. ale cc salets|se fers /elessialelcieletels sieisiely o}<istelstete 404 
pee (Goel om Cacavittese siaicterieictersiois stale atsieisiatelel che) steleletefetersie eiatet sede 406 
3. Vascular system ....ccesccee recs ces cvccecsesecnesesancce 408 
WAIL, Tit DIESTAMEE Sere OO te De bOo SO GOOUIGIe TOOc Moon oOGs GO Gaco HuGn AmcAS 410 
VIII. The Ectoblast and its products... ...cececcseccnccencscccsescessess 4II 
iy Ganaril 4566 socoocounneacdocacpanopocsorococnesesaounT 411 
PHS TOM OMS [MI steleteieieieleletere) cf eiel aie csteietahelleleverel eforalimjetaietoreliausvujaelsevatete 412 
3. Proctodaeum.....cecessseeeccececssccesecncecssccecencece 414 
TEGs Nervous GyStent « jaiainie s:ojei5:2:0 cl ojein aie ofall faraje aimyufe ale ole = nualmieimie Ams pla\sia uote 415 
1. Relations of the cephalic ganglia to the ventral chain.......... 416 
2. Concrescence of the neural cords. ........eeeeeeseeccssseses 417 
MecBxeeretory Organs ..0.5. cen ecccs seccwemeeseneresassscideeces ates 419 
Tas UNtLOCUCEOKY \c}a/s)ccje)scjalete elesieis ss v= sls) 'einic sago Noue osadccdnde 419 
2. Head-kidney ........ sicoococadsdenoc Jats sonacneaGa7d6ac 422 
3. Permanent nephrida.......... LEA OSOHOE SohodennacnooGennse 423 
