CONTENTS 
1915 
No. 1. MARCH 
Pauutine H. DepErER. Oogenesis in Philosamia cynthia. Sixty-four figures 
PMT Pn Sie) rae oe i NRO ee eg aid VsreD o = 5 oss a Co, ETE poe 
Wituiam H. F. Appison anp J. L. Appieton, Jr. The structure and growth 
of the incisor teeth of the albino rat. Twenty-nine figures............... 
James G. Hucues, Jr. A peculiar structure in the electroplax of the star- 
Razer, Astroscopus guitatus. Vhree figures. ........ 051 o. que. ee alle 
W. Rees Bremner Rospertson. Chromosome studies. III. Inequalities and 
deficiencies in homologous chromosomes: their bearing upon synapsis and 
the loss of unit characters. Fourteen figures (three plates)............... 
No. 2. JUNE 
Grorce W. TannrEuTHER. The embryology of Bdellodrilus philadelphicus. 
went y-clxiemntioureseandseight plates........... cae. sete ane eee 
KE. E. Just. The morphology of normal fertilization in Platynereis megalops 
PT 9 2a) EA Posi Cs ON rom TEV 2) Sen a cD ORR IE we hice Boia 
Wn. A. Kepner AND J. R. Casu. Ciliated pits of Stenostoma. Tour figures 
G. Cart Huser. The development of the albino rat, Mus norvegicus albinus. 
I. From the pronuclear stage to the stage of mesoderm anlage; end of the 
first to the end of the ninth day. Thirty-two figures................... 
G. Cart Huser. The development of the albino rat, Mus norvegicus albinus. 
II. Abnormal ova: end of the first to the end of the ninth day. Ten figures. 3! 
MARIANNA VAN HERWERDEN. Comment on Miss Beckwith’s paper on ‘‘The 
genesis of the plasma-structure in Hydractinia echinata’’ and reply by 
LAINE. Sree SG pe eater ea i A a LY as PN ee Sd 
No. 3. SEPTEMBER 
EK. A. BAumaarTNER. The development of the hypophysis in Squalus Acan- 
cee OEE VEE IR PTGR 2 et 8.. fa). .d,s.0 0c s > sashes DR EE 
J. Frank Dantet. The anatomy of Heterodontus francisci. II. The endo- 
ekeletan. “Dhirsy-one fieures (eight plates) ........cud.<cssscuees neues ee 
Rozsert W. Heener. Studies on germ cells. IV. Protoplasmic differentia- 
tion in the oocytes of certain Hymenoptera. Ninety-seven figures 
mrs eom esa a ee EE MUR BN IS. Ys. aig tials dhave ac /d PAH + Cee 
No. 4. DECEMBER - 
EpwarpD Puetrs Auuis, JR. The homologies of the hyomandibula of the 
MU aMeE CRASHES.) AOMOUNOUTE .! 0b oiaca aa slo dv elle ERY vale pga e ele aes «aaa f 
James L. Ketioce. Ciliary mechanisms of lamellibranchs with descriptions 
Or Aan ENLY=bWO IP UTES. you 4 a vais. < a's sc 0 science aaiaie'e shite eiien Gere 
A. T. Evans. The morphology of the frontal appendage of the male in the 
Phyllopod crustacean Thamnocephalus platyurus Packard. Nine figures. . 
109 
387 
391 
447 
495 
703 
