157 



in the lypo. The spimilatioii, of course, varies with the size of the pro- 

 cesses. Some sj)eciinens observed aUve at Misaki, Japan, in June 1!)1 I, 

 were found to have the stomach green, while some tiny red pigment grains 

 were scattered along the body skeleton. No pigment spots in the tip of 

 the arms. 



Numerous specimens were found from .Japan to the Red Sea: Misaki, 

 Japan, 29/ IV, 2-17/VI. 1911; Zamboanga, l/III. 1914; Malacca Strait, 



Fig. 84. Skelcloii of Ophiopliileus serratus. -"»/,. Letters as in lig. 61. 



30/XI. 1899; S. of Koh Chuen, dull of Siam, ii^ III. 190U; 89 15' E. 5^55' N. 

 (Bay of Bengal), 5/1. 1914 (1 specimen); 73° 34' E. 7° 37' N. 26/IV. 1900 

 (1 specimen); Gulf of Aden, 1 1/XI. 1899; Strait of Bab-el-Mandeb, 5/V. 

 1900 (1 specimen); off .Jebel Zukur, Red Sea, 5/V. 1900; Suez, 31/1. 1898 

 (Mr. H. Mortensen). 



A very interesting t'eaUire is connected with the melamorpliosis of this 

 larval type. The suboral cavity continues some way down in Ihe body, as a 

 pouch on each side of the stomach. In the wall along the bottom of this 

 pouch a thickening a|)pears at I he lime, when the hydrocoel begins to 

 form lobes (PI. XXVIII, P^ig. 2): tliis thickening grows very considerably 

 and forms lobes, which ultimately combine with tlie lobes of the hydrocoel. 



