270 ANIMAL HORMONES 



*PLH: Palaemonetes-lightenixig hormone, concentrating red pigment 

 in chromatophores ; released from sinus gland (see PDH). 



*PWCH: Palaemonetes-wh.ite-conctntra.ting hormone, concentrating 

 pigment in guanophores; possibly secreted by the commissures. 



*PWDH: Palaemonetes-white-dispcrsing hormone dispersing pigment 

 in guanophores (making animal pale) ; released from sinus gland. 



*RPCH: Retinal-pigment-concentrating hormone of some decapod 

 Crustacea; possibly secreted by the commissures. 



*RPDH: Retinal-pigment- dispersing hormone of some decapod 

 Crustacea; released from sinus gland. 

 SG: Sinus gland of Crustacea, a storage-and-release organ for several 



hormones from neurosecretory cells in brain and GXO. 

 s.n.c. : Neurosecretory cells in the suboesophageal ganglion of insects. 

 Steroids: 17-OH steroids. Characteristic secretions of the adrenal 

 cortex, as in 17-hydroxycorticosterone or hydrocortisone. 



*STH: Somatotrophin, or growth hormone, from adenohypophysis 

 of vertebrates, stimulating secretion of *glucagon. 

 Sudanophilic: of tissues with lipids which dissolve, and become 

 coloured easily by, Sudan reds or black. 



*TSH: Thyrotrophin, or thyroid-stimulating hormone, from adeno- 

 hypophysis of vertebrates. 



*UDH: C/ffl- darkening hormone, dispersing black pigment in melano- 

 phores of Crustacea, such as crabs (Decapoda reptantia, Brachy- 

 ura) ; released from sinus gland. 



*ULH: t/c«-lightening hormone, concentrating black pigment in crab 

 melanophores. Source unknown. 



*URCH: t/^(2-red-concentrating hormones, concentrating pigment in 

 crab erythrophores ; present in extracts of C.N.S. 



*URDH: Uca-rcd-dispevsing hormones, dispersing pigment in crab 

 erythrophores ; released from sinus gland. 



*UWCH: t/cfl-white-concentrating hormone, acting on pigment in 

 crab guanophores. Source unknown. 



*UWDH: C/cfl-white-dispersing hormone, acting on pigment in crab 

 guanophores. Source unknown. 



*Vasopressin : name for *ADH in mammals. 



*W: Melanophore-concentrating hormone, concentrating black pig- 

 ment of Amphibia; probably secreted by pars tuberalis of adeno- 

 hypophysis. 

 X-organ: Used for two organs in crustacean eyestalk: GXO, and also 



HSPO, for which it was the original name. 

 Y-organ: Endocrine gland in head of Crustacea, secreting *MPH. 



