1890.] HELODERMA SUSPECTUM. 243 



Reptilia of Central America and Mexico, places the Heloder- 

 midae between the Xenosaurida) and the Anguidse. 



(62) 1888. Yarrow (II. C.).— Bite of the Gila Monster. Forest 

 and Stream, New York, June 14th. Vol. xxx. no. 21, 

 pp. 412, 413. — (This is part vi. of this writer's series of 

 papers on " Snake Bite and its Antidote," in the same 

 newspaper.) 



(03) 1888. Idem. — A Reference Handbook of the Medical Sciences, 

 embracing the entire range of Scientific and Practical Medi- 

 cine and Allied Science. By various writers. Illustrated 

 by chromolithographs and fine wood-engravings. Edited by 

 Albert H. Buck. New York (William Wood & Co.). 

 Vol. vi. p. 171, pi. 28. — (Plate 28 is a chromolithograph of 

 Helodernm suspectum, and illustrates the article contributed 

 by Dr. Yarrow, entitled "Reptiles, poisonous," pp. 165-1/4 

 — a few brief remarks on p. 171, within the title, being 

 devoted to the Heloderma.) 



((.4) 1889. Mitchell (S. Weir).— The Poison of Serpents. The 

 Century Illustrated Monthly Magazine, vol. xxxviii. no. 4. 

 New York, August 1889, p. .505. — (A popular account of 

 venomous reptiles, wherein an allusion is made to the 

 poisonous saliva of Heloderma suspectum ; an indifferent 

 figure of the reptile illustrates the article.) 



EXPLANATION OF THE PLATES. 



Plate XVI. 



All figui-es reduced f. 



I' ig. 1 . Direct ventral view of the liver, gall-bladder, and ducts, &c. of an adult 

 specimen of //efo(('<r7?;a susjjectum. ^.6., gall-bladder ; »-./., right lobe 

 of liver ; l.L, left lobe of liver. 



2. Direct dorsal aspect of the same specimen as is shown in figure 1 with 



additional parts added. I.e., lobulus cardiacus ; P.v., portal vein ; 

 d.c, common duct; a.a.v., anterior abdominal vein; ^.c, a structure 

 that appeared like a ganglionic enlargement upon the pancreatic duct 

 in the case of the specimen examined ; p., pancreas ; d., duodenum. 



3. Direct ventral view of the heart, lungs, thyroid gland, and other parts 



of Heloderma stisjjectum. The various organs are in situ, but the 

 pericardium and other serous membranes have been removed with the 

 exception of I.e., lobus cardiacus. f.r., trachea ; c.a., carotid artery ; 

 t.g., thyroid gland ; r.L, right lung ; I.e., anterior cap of the peritoneum 

 (cut short) in which the lobulus cardiac^in of the liver is lodged were that 

 organ represented in the drawing in situ ; a?., oesophagus ; i.j., internal 

 jugular ; l.L, left lung ; H., heart (showing the ventricle and the two 

 auricles). 



4. Ventral view of the head of an adult specimen of Heloderma suspectum 



witli the integuments removed, and showing the poison-glands. The tip 

 of the tongue (7") is protruding from the mouth, and the mandible (iV/) 

 is partially seen through the superficial layer of muscles. The left 

 poison-gland {p-gl') is represented as being drawn outwards by 

 means of a small dissecting hook and chain, to expose its four ducts 

 which lead through the mandible to the bases of the teeth. On the 

 right side the gland is shown in situ [p.gL), as well as the vein that 

 returns the blood from it and afterwards joins the external jugidar. 



[97] 



