244 DR. SHUFELDT ON HELODERMA SUSPECTUM. [Apr. 1. 



Plate XVII. 

 Fig. 1. Left lateral view of skull and mandible of a specimen of Heloderma 

 suspectum, the latter disarticulated ; life-size from the specimen (adult). 

 mx., maxillary; ^jw.r., premaxillary; smx., seplomaxillary ; oL, co- 

 ossified dermal tubercles ; prf., prefrontal ; ./>., frontal ; pxf., post- 

 frontal ; /., jugal; /la., parietal; co., columella ; ^)-.o., prootic ; sq., 

 squamosal ; pi., pterygoid ; rj., vestige or rudiment of zygomatic 

 arch; q., quadrate; d., dentary; com., complementare ; cor., coron- 

 oideum ; ar., articulare ; an., angulare. 



2. Superior view of the right ramus of the mandible of H. suspcctum. 



op., operculare. Other letters as in Fig. 1. 



3. Mesial aspect of the right ramus of the mandible of H. suspectum. 



Letters as in Fig. 1. 



4. Superior aspect of the skull of H. suspcctum, the mandible removed. 



I., laerymal ; I.e., lacrymal canal ; so., supraoccipital. Other letters as 

 in Fig. 1. 



5. Superior aspect of the skull of H. horridium, mandible removed. (After 



Bocourt.) Lettering as in Fig. 1. 



6. Ventral aspect of the skull of H. suspcctum, mandible removed ; life 



size. tt., teeth ; v., vomer ; pi., palatine ; tr., transpalatine (os 

 trauversum) ; bs., basisphenoid ; htp., basipterygoid process ; eo., 

 exoccipital ; ho., basioccipital. Other letters as in Fig. 1. 



Plate XVIII. 



Fig. \. Dorsal aspect of the right pelvic limb of a specimen of H. suspcctum, 

 natural size. /., femur; p., patella; t., tibia; fh., fibula; t,fe., tibio- 

 fibularo ; tr., distal tarsalia ; c, epiphysis on proximal extremity of 

 metatarsal of the second toe. 



2. Ventral aspect of right humerus of a specimen of H. suspcctum, natural 



size, h., humerus. 



3. Dorsal aspect of the antibrachium, carpus, and nianus of the right 



pectoral limb of H. siispectum, natural size. uL, ulna ; rcL, radius ; 

 uc. ulnare; re., radiale; jo., pisiforme; c, contrale; cp., distal carpalia. 



4. Direct dorsal view of the pelvis and sacrum of H. sicspccturn, natural 



size, ph., pubis ; of., foramen for the passage of the obturator nerve ; 

 il., ilium ; f.cr., foramen cordiforme ; J^-p., pectineal process ; is., 

 ischium; sv^ and sv'^, the two vertebrae that go to form the sacrum, 

 tlie first and second respectively. 



5. Ventral aspect of the sternum and shoulder-girdle and associated parts 



of H. suspcctum, natural size, s., scapula; cL, clavicle; co., coracoid; 

 ic, interclavicle ; st., sternum ; c.rh., costal ribs. 



6. Ventral aspect of the hyoid arches of H. suspcctum, somewhat enlarged. 



h.hy., basihyal ; a.co., anterior cornua ; p.co., posterior cornua. 



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