THE PYCNOGONIDA. 



333 



On the other hand, the hexa|)od larva of the Pj/cnof/onida 

 diders from the hexapod NanpliiLS of the Crustacea, inasmuch 

 as the three pairs of appendages of a NaiqMus always rcpre- 



Fio. ^2.—Macrobiotm 8chnUzei{y. 100).— a. month with nix oral papill.i' ; ^, cm Hot, 

 calcifhul HfyU'ts; o, Halivuiy f,'lun(lK ; d, (niiHciihir pharynx ; c. (»vary ; /, vcniciila 

 sriniiialiH ; f/, IuhUh ; 1, 2, JJ, I, liinbs. (AfKir (irocff.') 



sent antennary and mandihiihir !ipp(Mida<z:('S, and tluise, by the 

 hypothesis, are to be sou^-lit in tlie rostrum of tiie Pi/cynogo- 

 nida. 



The faet to whieli refcrenec; lias already been made, that 

 the embryo Scorpion has six pairs of rudimentary appen(laL,es, 

 atta(^iied to as many of the ant(;rior free somites, of vvhi(;li one 

 pair only remain (as the^pcetines) in the adult, leads me to 

 suspccl that the Pycno(j()>i.ida may represent a nuich modified 



» " IJntersuchungon iibcr den Buu der Biirthiorchon." (" Archiv fiir raikr. 

 Anat.," 1866.) 



