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scutes (the transparent keel) and of the upper row of dorsal plates as well as the dorsal spuie arc pre- 

 served. Through the latter are seen the cartilaginous axes of the interspiuous bones 3 and 4. 



Head. so: supraoceipital. 



pt : postteniporal (supraclavicular I). 

 sq: pterotic (squamosal), 

 fr: frontal, 

 prf: prefrontal, 

 pf: postfrontal, 

 na: nasal. 



ao: preorbital (antorbital). 

 pro: preopercular. 

 u : urohyal. 

 Trunk. 1 — 4: foremost group of interspiuous bones. 



5 — 7: the following interspiuous bones, forming stays for first dorsal. 



': first interspinous bone of second dorsal. 

 1 — VI: the six elongated anterior abdominal vertebræ. 

 a, b: anterior and posterior part of vertebral arch. 

 Shoulder girdle. cl : clavicle (the part covered by the cuirass is shown by the lighter shading), 

 so: scapula, 

 co: coracoid. 

 pel : postclavicle. 

 o : foramen. 

 Pubic arch. i: "pubic" bone or "pelvis". 



Dorsal fin and Trunk. 



Shoulder girdle. 

 Pubic arch. 



of first dorsal. 



Fig. 2: Centrisciis scolopax. Skeleton, x ca. 2. 



pa : palatine, 

 ekt: ectopterygoid. 

 qu: quadratum. 

 mt : metapterygoid. 

 sy: symplectic. 

 hy: hyoid. 



R': first spinous ray \ 

 R: second spinous ray / 

 r': first ray (spinous) of second dorsal. 



1': lateral thickening of the upper end of third interspinous bone. 

 1: lateral bony piece of the upper end of fourth interspinous bone, 

 t: unpaired upper prolongation of the same interspinal (cfr. t figs. 2 and 3 

 on Plate I). 

 5—9: interspinous bones, coalesced with more or less reduced spinous rays, for- 

 ming stays for the membrane of first dorsal. 

 I — V: five anterior elongated abdominal vertebræ. 

 sel: supraclavicular (II). 

 i: part of "pelvis" corresponding to i in Fig. 1. 



p: posterior part of pelvis, roofing over the ventrals when pressed to the body. 

 Other letters as in Fig. 1. 



