26 SUMMARY OF CURRENT RESEARCHES RELATING TO 



glands in normal and abnormal embryos might throw some light on the 

 question. No correlation was seen between either brachydactyly or 

 tarsal feathering and Polydactyly and form of comb. J. A. T. 



Ultimobranchial Bodies in Pig.— J. A. BJJdeetscher (^m^r. 

 Journ. Anat., 1919, 25, 13-23, 4 figs.). The peripheral portion of the 

 ultimobranchial bodies generally develops into typical thyroid structures 

 before its more central portion. The ultimobranchial bodies which can 

 be recognized structurally as such in the thyroid gland of post-natal pigs 

 are mere remnants of these structures that have not fully developed into 

 typical thyroid structures. They consist of nucleated syncytial cords- 

 and masses, the central portion of which may be free from colloids. It 

 is probable that there is a genetic relationship between ultimobranchial 

 bodies and large (cystoid) follicles that appear in the thyroid. Only a 

 relatively small portion of the thyroid is derived from the ultimo- 

 branchial bodies, but the proportion undoubtedly varies. J. A. T. 



Development of Hypophysis. — Wayne J. Atwell and Ida Sitler 

 {Anat. Record, 1918, 15, 181-7, 5 figs.). The epithelial portion of the 

 hypophysis consists of three distinct parts : {a) the pars anterior 

 propria, which is the principal epithelial lobe and the bulk of the gland ; 

 Ip) the pars intermedia, a thin epithelial layer, which becomes intimately 

 associated with the neural lobe ; and (c) the pars tuberalis, closely 

 related to the tuber cinereum. The tuberal processes arise from the 

 lateral lobes, which are formed early from the nasal wall of the early 

 hypophysial primordium. J. A. T. 



Development of Hypophysis of Reptiles. — E. A. Baumgartner 

 {Journ. Morphol., 191G, 28, 209-85). The epithelial portion of the 

 hypophysis develops as a single primordium in turtles, lizards and snakes, 

 and probably in alligators. In the development of the evaginations of 

 the hypophysis Ratke's pouch appears first, then two lateral buds, and 

 finally the anterior bud. The lateral buds in turtles give rise to the part 

 termed by Tilney the " pars tuberalis," and to a thin cortical zone 

 around the middle of the anterior lobe ; in alligators, to the pars tuberalis 

 and two bands encircling the anterior lobe ; in lizards they appear to 

 persist as isolated masses or to disappear ; in snakes they completely 

 disappear. The tip of Ratke's pouch gives rise to the pars infundibuli- 

 formis (Tilney) or pars intermedia of the adult. The remainder of 

 Ratke's pouch and the earlier anterior bud give rise to the adult anterior 

 lobe, except for the thin cortex or band around it in turtles and alligators. 

 The three parts of the adult hypophysis are distinct histologically as 

 well as ontogenetically. The pars infundibuhformis or pars intermedia 

 has a laminar arrangement of columnar clear-staining cells. The parts 

 derived from the lateral buds are arranged in columns (or sometimes 

 acini) of clear-staining polyhedral cells. The anterior lobe proper is 

 formed of columns or acini, with clear-staining and darkly-staining cells 

 which may be acidophilic or basophilic. In general, the pars intermedia 

 and the parts derived from the lateral buds may be considered the 

 chromophobic and the anterior lobe the chromophilic part. J. A. T. 



