370 Harris Hawthorne Wilder 



there is already an abundance among teratological literature. Two such 

 topics will be treated in this paper; the first of which is a general de- 

 scription of Teras III, with especial treatment of the auditory ossicles 

 and the circulatory system. This monster belongs to the type called 

 "Synote" and I shall refer to it as the "Baldwin Synote" from the donor 

 of the specimen. The second topic is a comparison between various 

 types of double eyes, as they occur in all three of the groups given above. 

 In a work of this nature, more than in perhaps any other, the investi- 

 gator is dependent for his material upon the thoughtfulness and gen- 

 erosity of others, and it is thus with especial earnestness that I wish here 

 to personally thank those who have so kindly aided me in this respect. 

 Dr. F. D. Lambert, who inspects many hundreds of pig embryos yearly, 

 has sent me everything abnormal which has come under his inspection, 

 and I wish especially to mention the beautiful specimen, No. I, which 

 came to me faultlessly preserved, so that I was able to section the entire 

 specimen and make wax-plate models of several of the parts, an opportun- 

 ity that has seldom if ever come to the teratologist. The human Synote, 

 ISTo. Ill, also beautifully preserved, was given me by Dr. James F. Bald- 

 win, the Chief of Staff of Grant Hospital, Columbus, Ohio, who pre- 

 ferred to have the specimen used for scientific investigation rather than 

 to keep it "simply as a curiosity." In using such a valuable specimen I 

 feel the responsibility for good results and only hope that they will 

 justify the sacrifice. An especially valuable aid in my investigations has 

 come from the Wistar Institute of Anatomy, in Philadelphia, largely 

 through the kindness of its director. Dr. Milton J. Greenman, who has 

 loaned me numerous specimens for study and even dissection. Prof. 

 B. G. Wilder, of Cornell University, has been untiring in obtaining for 

 me Cosmobia of various sorts, his most valued contribution being perhaps 

 the diprosopic pig, No. XII, which, delivered at term, belongs in the same 

 series as Dr. Lambert's beautiful specimen. No. I, and thus enables me 

 to trace the later development of this form of monster; the fact that the 

 two differ slightly in the degree of separation of the two components 

 enhances the value of both specimens.® The two-headed snake, Storeria 

 occipitomaculata (Teras II) was sent me by Dr. Alvin Davidson, of 

 Lafayette, and Drs. Mead and Gorham, of Brown University, have fur- 

 nished me with several valuable specimens. 



•One of Professor Wilder's latest specimens, Teras XXX, mentioned in a 

 previous footnote and figured here as Fig. 27&, will perhaps vie with Teras XII 

 in point of value. This came too late for proper treatment here, but will 

 serve for later research, especially in connection with Teras I. 



