CONTENTS 
No. 1. JUNE 
ETHEL Browne Harvey. A review of the chromosome numbers in the Meta- 
TROVE EAE ea aM ao elo Acasa ey esi ee as cr ol eae cee Cee ee Aa gene Are eT l 
Jost F. Noniprz. The meiotic phenomena in the spermatogenesis of Blaps, 
with special reference to the X-complex. Eighty-six figures.............. 69 
Epwarp L. Rick. The development of the skull in the skink, Eumeces quin- 
quelineatus L. JI. The chondrocranium. Twelve plates (thirty-three 
(TREAT TOSS) os og Re ee I A A at. hn ee 119 
No. 2. SEPTEMBER 
W. Haroip Leicu-SHarpg. The comparative morphology of the secondary 
sexual characters of Elasmobranch fishes. I. The claspers, clasper siphons, 
anduclasper glands wliwelver text MouneSiosmocikea ssa cneioscce sarees: 245 
FRANZ SCHRADER. Sex determination in the white-fly (Trialeurodes vapor- 
ariorum). Four plates) (thirty-six figures)).. 2.6. .ds..e<5.c0+00ssasoneede 267 
Taku Komat. Spermatogenesis of Squilla oratoria De Haan. Three plates 
(hGH OM Cpt OALGES) cps sce ete ao cartes Por aes te, Lape oh eR SRE aoa ee ale treaty pect 307 
James Rouuin StonakeR. Some morphological changes for adaptation in the 
THOUS, Lome jollennech (CiyneaeyAtOue ike) a5 5 go aan dnoccohoponcesuooeseoee 335 
MircHet Carrouyu. An extra dryad and an extra tetrad in the spermatogenesis 
of Camnula pellucida (Orthoptera); numerical variations in the chromo- 
some complex within the individual. Fourteen plates (one hundred and 
Thirty-nine meures))andvone doubles plates. .5 +. ss5e sce eee okie 375 
No. 3. DECEMBER 
Westey R. Cor anp Stantey C. Batu. The pelagic nemertean Nectonemertes. 
HMiNeuplabesa (SEVEN beeM MO LITES)): Wc we leeks aaaticnesd Shs cae oeute aecdh fees 457 
A. B. Dawson. The integument of Necturus maculosus. Six plates (thirty- 
SVC TMU UIT EG) hath Pye ta yas Min Staaten s SCALA, AU PT ne SET Loo chose ae Co 487 
CaRoLINeE Buritincg THompson and THomas Evuiorr Snyper. The ‘third 
form,’ the wingless reproductive type of termites: Reticulitermes and Pho- 
rhinotermes. Twenty figures and three plates (figures twenty-one to 
CE VICIRD OSI RAE) ead 8 of a aL SE Sec ae ge Ze RL 591 
