19161 



Daniel: The Anatomy of Hepfaiichuti maettlatus 



355 



the duct from the thyroid gland. It is further without a ghissal 

 projection like that of Heterodontus (Daniel, 1915). 



A first basibranchial piece is lacking in Heptanchus maculattis 

 unless, as seems improbable, it be represented by the point at the 



Pig. B. Median basibranchial and associated cartilages, Heptaiiclms maculatus, 

 dorsal view (XI). 



bb S-4., second to fourth basibranchial cartilages; bh., basihyoid; cb^., 

 eighth rudimentary eeratobranchial; eh., ceratoliyoid; hb^-''., first to seventh 

 hypobranchials; mp., median piece. 



posterior part of the basihyoid as suggested by Goodey (1910) for 

 Clilamydmelachus. At the union of the second to the fourth pairs 

 of hypobranchials basibranchials (bb.3-4) are present. A large median 

 piece serves as an attachment for the fifth and the sixth hypobranchials, 

 and the seventh eeratobranchials. 



