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2r>2 miLLKTIN :tt, IINITKI) STATKH NATIONAL MUSKUM. 



Tliemid n'j;ioii.s of (lie Soiitliwrst I'liniisli llie nivali-r \iirii'l.v of spocJeH 

 of IJiilo, Imt one spi-cics iiiliabitiiii; tlii' i-iisti'iii H';;i(m. Tin', Aii.strori- 

 psniaii royioii is the lioiiic of scvcriil small Ibriiis of ll^lida- aiul Ilii 

 foiiida'. The (iistiibiitioii of tlic Srapliiopida- is cliiclly in tlio drvt'r 

 rcyioiiH of llio West; \\\\vo species are fomiil in the Soiioraii, while Iml 

 one occurs in th<^ I'acitie, and one in the eastern and Anstroriparian 

 regions. Tiie distiiltution may Ite lalnilaled as (bliows: 



(ii'iii'ia. 



All-IIM 



I'iliiiliitii l{. 



K.isli'in Criiliiil. S(iii(p|;iii. i'acillc. 



Unto 



Sra|iliiii|>iiH . 



('llMIOIlllilllS . 



llvlii 



All is 



IIvIikIi'm 



Svirliii|iliiiH . 

 K'liiia 



Tiitals 



L'l 



H 

 III 



A(1L<)S"^A. 



The few members «d" this snboich'V have the vertebra' opisthocodous 

 and deprive<l of ribs; tiie diapophyses of the third antltburtli verteltra' 

 are extremely elongate, and those of the sacral are stron.uly dilated and 

 continent with the nrost\le. The third ct'iatolnanchials are ;ireatly 

 elonjxated. 



lii I'ipti there are only seven presacral veitebrn'. 



The frontopaiietals are entirely ossilied, and there art* tr(M' ossa 

 nasalia. 



The sternal apparatus belon.us to the arciterons type, thonj>h tiio 

 epicorai^oid cartila,ues do n(»t oveilap. 



The larva' are provided witii two spiracnla, one on each side of the 

 body. (IJotilenjier). 



There are two recent ami one extinct families of this snlxtrder, which 

 are <lelined as tbilows: 



IMIMD.i:. 



No ribs; vertebra' opisthoco'lons; iirostyle simple, attached to a 

 siiifjle condyle. Coracoid and epicoiaroid divei;;ent, their connecting 

 ar<!'.u's not overlappin*;. No mannlninm. Teeth none; sacral dia- 

 pophyses <lilated. 



The neotr(;^)ical genns Pipa has the atlas continent with the .second 

 vertebra, so tiiat there are bnt seven anterior to the saciiim. There are 

 distinct nasal bones, and tln^ median septnin of the ethmoid is partially 

 ossilied. The prefrontals ariM-ompIetely in contact with each other and 

 with the frontopari«'tal. Fror.toi)arietal completely ossilied. Terminal 

 ])lialan}jes ac,nt»s sitnide. I-Ixternal m.'tatarsals separated by a web. 

 (Plate 01), tigs. 1-L'.) 



