CONTENTS 
No. 1. MARCH 
Cart G. Hartman. Studies in the development of the opossum (Didelphys 
virginiana L.). III. Description of new material on maturation, cleavage, 
and entoderm formation. IV. The bilaminar blastocyst. Bight text fig- 
ures and twenty-two plates. . So Spats rcaneio aio OEE NOI oi 
Epwarp PHeEeLps ALLIS, JR. The nee and ne nasal Pee tes in ie a 
OSHA SiS NAHM syb-qR OANA DIKAS ARES ae ro ccia a ae Geer e Ao Gin aebioe atin dane c 
No. 2. JUNE 
Epwarpb Puetps Auuis, JR. The myodome and trigemino-facialis chamber of 
fishes and the corresponding cavities in higher vertebrates. Four plates 
Ghwemuyan ime lfielITes) iio feed 2 apres Sy em ereatee aye! Cia) days mal cee ae ne. ek ae 
ArtHur WILLIAM Meyer. On the nature, occurrence, and identity of the 
plasmeance lls7Ot HORACE i nee ecco a yrcadat ist clsa comets tt gla oes ree a ater eens 
ApoupH R. RincoeN. The development of the gastric glands in Squalus acan- 
thias. Three plates (seven figures).. fs eee etic Geel ce caeerentarars 6 
GitMAN A. Drew. Sexual activities of Ne squid, ative peal (Les. ) “The 
spermatophore; its structure, ejaculation, and formation. Six plates (forty- 
(OMAR CAE DSTSD | eee NEP ane Cay SR ste ta us age oye eae SHU) ll a eI Le tS 
No. 3. SEPTEMBER 
Witiiam M. GotpsmitH. A comparative study of the chromosomes of the tiger 
beetles (Cicindelidae). One hundred twenty-seven figures (ten plates). ... 
BENNET M. ALLEN. The development of the thyreoid glands of Bufo and their 
normal relation to metamorphosis. One plate (six figures) and one text 
JORA DHS) 5 Bs teu aes ce Ata opener Nass RRS Let ba een 1 OS noe ce eee cele 
Waro Nakanara. A study of the chromosomes in the spermatogenesis of the 
stonefly, Perla immarginata Say, with special reference to the question of 
synapsis. Three plates (fifty-one figures) .. ot ones STA : 
Stipnney I. Kornwavser. The sexual cheteererenes of the twee Thelia 
bimaculata (Fabr.). I. External changes induced s eats theliae 
(Gahan). Fifty-four text figures .. 2 SOE COONS Sr REE RN eaais css ope 
Toxuyasu Kupo. The facial oe Ge et abe Tiaaeae: ae text fics 
and three plates. . niece Tne Nem Sica Beeege : 
CLARENCE L. TURNER. “The Scone ne in ate spermary oe he ee epee 
foumpapure se. 30. sew tas a tyne cre 
ili 
145 
207 
327 
. dol 
379 
437 
. 489 
. 509 
. ddl 
. 637 
. 681 
