Vol. XXII. May, 1912. No. 6 



BIOLOGICAL BULLETIN 



A PRELIMINARY ACCOUNT < T THE DEVELOPMENT 



I THF. APYRENE SPERMATOZOA IX STRo.MHl'* 

 AND OF Till-. M RSE CELLS IX LITTORIXA 



KIAYIN I Kl !\KI . 

 -\i\. 



Tin- dimorphic >j>rnn.n< >/< >.i in nbus wen- fir-t de-cril >rd 



ly Brock in INS; in th* v Lt-nti^inosns. While accurate 



enough in .general, hi- account i- lacking in certain interesting 

 details and he al-o made no attempt to trace the de\ elopmental 

 Stages of cither kind of -perma!* I', 'ill his description 



ami hi- liv.mv-, however, are -nllicienl to -hu\v h"\\ marked and 

 striking i-> the diniorphi-in e\i-tiir^ here .md it i- Mirpri-in.^ that 

 thi- ha- not bei-n made the -iil.jecL of further Hive-libation \>\ 

 m. i.- M < < in workers. 



Mv attention Was attracted t" X'/^;;."'./r. in Ma\. I'd I, \\hile 

 at tlie ].-mporar\ lal .. .rator\ i-tal 'li-hed l\ 'I'he ( lamegie Institu- 

 tion "t \\ a-liinul"ti at l'rt l\..\al. Jamaiia. \\'. I. There I had 

 tlie o|)portunit\- of .il)-er\in^ the li\ in- -permai' 'iid also ot 



-eciirin- a 1m of material for further -tud\ . The species -uidud 

 \\.i- .Y bituberculatus. M\- thank- are due t.i 1 >r. II. A. Til-hry 

 ot The Ac.idrnu of Natural Scieiic.-- of 1'hiladelphia. who kindly 

 identilied it for me. 



Ad"])tin:4 the terminoln-y -u-^e-ttd l.v \\'alde\ir and u-ed 



iii-~i |.\ Meves the two kind- of spermatozoa found in 



Stronilms are the eiipyivnc. /. <., tho-u that function in the ordi- 

 nary way, and the ap\ rene whose function is unknown and in 

 who.-e adult -tnicture there i> no at'tixe nuclear material. The 

 cupyrene spermatozoa do not pre-ent aii\ s (r ikinj; diften ; 

 from those found in other form- \\hich ha\e the same -exual 

 dimorphism, Palndiini for example, but they lack tlie tenuous 



3'9 



