THE EMBRYOLOGY AND OOGENESIS OF ANU- 
RIDA MARITIMA (GUER,). 
AGNES MARY CLAYPOLE. 
CONTENTS. 
PAGE 
Structure of adult ovary ....... psuseadvGnere ck hate anaistoradebopietacsusgvecaatesten sesntteetecestavetearorh eae: 220 
Wie tineUt Gn toc nc ee aad toe cece sSeea set cet ast ones saeee cs ~tv enncuine eter veatonien cee eo cee aE 22 
General comparisons of adult. ovary’ With 2.29. 52..0.02.-c- etcetera focuses pk 230 
Ayes {=s 0) 7219 Sea eect soe UC ees aS BORO BOE RD PEE ORAM EINE PAA Zs celery dv eu Ce 232 
AVI Vina OCl mesa tee eevee Seo ceectee cdanuaseeette svcd -teacaen events / 6 ava et eee eretwedn tee mesa ae OR 
INWUETIPIVERC CIS Roses ie cen eee Ere eae ode oe ES nee be See. 241 
| Byi8] 9) £00) 5 eneee os hates 5 RS ORR eee 8 ete ei ee Pe Ree eee ance Peat Kemer Fae et 
Winse sre mte dy Ovni sess ceer eee ecto seas ees eee ete Ree ee hs Sacre Moker greene en ee AY, 
Cleavace andesennnyl aye rho iin etl O Timreresee ree eeere eee ar en ae a 250 
Blastodermic membranes, Precephalic Organ) .2.2-...--cequnee-<c-25---ce--¢-c-eeecoeeree 255 
EM PLY.O} LO EM a tO MERLOT FOTIA eeevenes tease ae ecco eee meee 262 
@risinyotientod Gum ai ic. coke ies Ley Men trod ac cease saat eee eens awa 268 
DEVelopmMEentrOk re pLOCM CLIVE) ORO alll Sys eeee scree eaten sees ceeen eee 272 
General’ SWIMM ay a:-seccce- = sescncesssen ices te we stsech ee caveuune esas aca ect ssehos cement doceme eeeeeie tae 277 
INGLES ONENETVOUSISYS CCI, CL Caterer nase encanta rece scene ee 279 
IUD MO BAI eso cocsks ess ate RES te ae aia Pees aan Sah bs otadabeawast ae ces ences ear aebeee teal che 283 
TuE form chosen for this investigation is the small Collem- 
bolan, Anurida maritima , it is a form of very wide geographi- 
cal distribution. It has been reported from many different 
places on the eastern and western shores of the Atlantic Ocean, 
and is probably present at many others. It received its spe- 
cific name in Europe from the French naturalist Guérin in 
1829-38. It has also been called Achorutes maritimus by 
Grube and Lzpura maritima by Lubbock. According to the 
latest publications, Anurida belongs to the group Lipuridae, 
which, together with the Poduridae and Smynthuridae, form 
the suborder Collembola. Specimens were sent to Dr. H. T. 
Fernald, who confirmed their identification as Anurida ma- 
vittma. The only contribution on the subject already published 
is one by Ryder in the American Naturalist for 1886, where 
