THE ANATOMY OF HETERODONTUS FRANCISCI 
II. THE ENDOSKELETON! 
J. FRANK DANIEL 
From the Department of Zoology, University of California 
THIRTY-ONE FIGURES (EIGHT PLATES) 
CONTENTS 
MEET CHIOTMROAT RINE Ae one eM eh ae ark me ts Oa M5 5 ale eT ee 447 
Deelvevendoskeletorew «csr kc ts wens seed fia ols cle) oidDov wae Se Ae een 448 
Ite ASHE SIR IE HETOR GA Ieee. Rotate etal ghar i en ae oe ai Fane wil ike 449 
Meape TY pes coll Penne Mn EMSC ee ais a a Gace cad oes Re Gee 449 
Pea CRO ESATO NSS ME MISE. iS Src AMS wale. cavcid walle Same UC eee 449 
Dalhommecendleskcletoliccg a man < Jadels 2502s Gl 4 2a oe Dee. 455 
ee es ss Pe Me CP NUUMINTT hee? ee A ah on aa. 20 0.0 03 oo Ube ANCE 466 
We SEHG re Ulam BRCLEGUGID £850 0A 5. 2 Gin deed eae oe ve le Hd a ane ea ee 470 
fhe seclebouret tect girdles Pk. ces el SO eee 470 
Pa RGURCCUOTHE -PAPEIOCK s CORNER, Load roi e i las « wilde ghee DA 470 
pret news CIECUC dn tidang . fart Gut AE Piss <p owe a os asd Dia i eee 471 
Parbherskeletoniotthe fmSires. esas des cie es bass kates 402 Me) pee eae 471 
Pemlertesn (OR TEMOCL GAING TM AS RS Mee aw cnctls ee sales Sune vine wes ar SMe ee 471 
epelelreae Choma Mitr gy A See. Cau. ERS a Gee sexes hk | athe RR 471 
reer iehwac mmm: Ol Lem less eo). koe.) ve ae Had ol Sieulelesy ae eee 472 
SAU MEE LVeman Ol WAALS. 22 ice els esd e's Gee aye « ope whoop elas ghee cies 473 
|o Amelia evsui ures Cilia Oh 01: el ein soem 9 2 URE SR ee 473 
Ee egtire GG OLS a ETN me eae totes hs ct) Pog: stk soe eal re ee oe ae 473 
DEMIR ERSECOMCNG OSA merrier soe bce bani oe See ee ee 474 
Oesunenc and a liphinhs, Mee seca <M Aieiaccts, co Yanda» Shue kc eres 474 
ALS IN OS. SOG | Saale ol cee Mes Bean een ea Ree Daun Ce 475 
Literature cited..... caCORE es ct IN eee 475 
INTRODUCTION 
The skeleton of the elasmobranch fishes has served for numer- 
ous investigations which have contributed much to our knowledge. 
Principal among these researches may be mentioned ‘Das Kopf- 
skelet’ of Gegenbaur (’72) dealing with the head; studies on the 
1 Part I, The exoskeleton, published in Univ. Calif. Pub., Zool., 1914, vol. 13, 
p. 147. ‘ 
447 
