NECTURUS MACULATITS. 



437 



Explanation of Plates. 



(The outlines of all the figures were drawn with a camera, three times the natural size in the niajoi.'ty of the cases. 

 Since, however, the originals varied considerably in size, the resulting figures cannot be considered as proporlionat*! to one 

 another. The figures of the chondrocranium, for example (pi. (iS, figs. 4, 5), were drawn from a very small specimen and 

 enlarged four times, but the resulting figures are almost exactly comparable with those of the entire skull (pi. 63, figs. 2, 3) 

 drawn from a medium sized specimen at a magnification of but three diameters. A large skull at two diameters would give 

 about the size vi figures 2 and 3.) 



ABBHEVIATIONS USED. 



(The abbreviations given in the following list include tho.se ujsed in the figures, as well as those emploj-ed in the text 

 at various places.) 



1. Bones. 



A — atlas. 



ANG — angulare. 



BB — basibranchiale 2 



CS — costa sacralis. 



DENT — dentale. 



EXO — exoccipitale. 



F — frontale. 



FB — fibula. 



FM — femur (diaphysis). 



H — "1st haemal arch vertebra" (see text). 



HM — humerus (diaphysis). 



IL — ilium. 



IS — ischium. 



MC — metacarpalia. 



MT — metatarsalia. 



00 — opisthot i cum . 



OP — operculum . 



P — parietale. 



PB — parabasals. 



PH — phalanges. 



PMX — premaxillare. 



PC — pro oticum. 



PPT — palato-ptcrygoideuui. 



PQ — paracjuadratum. 



Q — quadratum. 



R — radius. 



S — sacriun. 



SC — scapula. 



SPL — spleniale. 



T — tibia. 



UL — ulna. 



V — vomer. 



2. Other Designations. 



Abbreviation. Name. 



a. b-o. — arcus basi-occipitalis. 



art. — articulare (Meckel's cartilage). 



a. s-o. — arcus supra-occipitalis. 



b. b. 1. — basibranchiale 1. 

 br. — bronchus. 



c. — carpalia. 



caps. nas. — capsula nasalis. 

 caps. opt. — capsula optica. 

 caps. ot. — capsula otica. 

 cart. lat. — cartilago lateralis. 

 cart. Mk. — cartilago Meckelii. 

 0. b. 1-2. — ceratobranchiale 1 et 2. 

 cent. — centrale. 

 c. h. — ceratohyale. 

 cond. ext. — condylus externus. 

 cond. int. — condylus internu-s. 

 cond. oc. — condylus occipitalis. 



Location. 



H and F.\I . 

 H and FM. 

 EXO. 



Abbreviation. Name. 

 cor. — coracoideum. 

 cr. lat. — crista lateralis 

 cr. mus. — crista muscularis. 

 or. temp. — crista temporalis. 

 cr. ventr. — crista ventralis. 



e. b. 1-4. — epibranchialia 1-4. 

 epiph. c. s. — epiphysis costae sacralis. 

 epiph. il. — epiphysis ilii. 



f . acet. — foramen acetabulare. 

 f. carp. — foramen carpale. 



f. cor. — foramen coracoideum. 



f. mand. — foramen mandibulare. 



f . nbtur. — foramen obturatorium. 



f. sty.-m. — foramen stylo-mastoideum. 



f. tars. — foramen tarsalc 



fib. — fibulare. 



fn. oval. — fenestra ovalis. 



Location 



FM. 



Pelvic girdle. 



F. 



H an<l FM. 



