264 



K. MITSUKURI : STUDIES ON 



No. 1663 : 7.9 cm. in length, 2.1 cm. in diameter, tail 0.9 cm. 

 Ion«:. Oral disk is 4.5 mm. in the former and 8 mm. in the latter, 

 the difference being due mostly to the state of contraction. Tentacles 

 15 in number, each probably with two processes near the free 

 end, but this point I was not able to make out definitely. The 

 calcareous ring is solid. The radialia have a posteriorly directed 

 process and end anteriorly in a tooth. In the region corresponding 

 to interradialia there are one or two grooves and as many anteriorly 

 directed processes. There is a stone-canal with a comparatively 

 large madreporic body. Polian vesicle one. In the first specimen 

 there are some minute papillae around the anus. 



Calcareous deposits : — I can not discover any distinct wine-red 

 particles. But there is a deposit of a greenish-yellow substance around 

 the table, and especially around the spire. This probably produces 

 the general coloring of the body. Although the deposit is amorphous 

 and of no 

 definite shape, 

 I think it more 

 than probable 

 that it repre- 

 sents the wine- 

 red particles. 

 I agree with 

 T H K E L in 

 thinking that 

 the presence 

 or absence of 

 wine-red par- 

 ticles can not 

 be made a specific character. The characteristic table of this 



Textfig. 53. 

 Trochostoma andanvmense : a — Small fcxble ; b, c — Large tables. ( x 150). 



