CRATEEOMORPHA MEYERI RUGOSA. 71 



hexactins are oitlior nearly equally represented or the latter 

 predominate over the former in numerical proportion, in which 

 cases the hypotlermal structure as regards its composition is much 

 the same as in the typical species. In the smallest specimen at 

 my disposal (text-fig. 1, A), the hypodermal latticework is 

 scarcely developed as such and can not he distinguished from the 

 choanosomal feltwork. 



The canalaria, which I have seen in l)oth incurrent and ex- 

 curront canals, arc rough pentactins with or without a rudiment 

 of a sixth ray ; occasionally they are stauractins or hexactins, 

 though in some individuals the latter form may be said to he 

 even al)undant. 



Of the hexasters, the microdiscohexaster (PI. IV., fig. 9) is 

 met with in moderate al)undance in 1)oth the subdermal and sub- 

 gastral regions. The terminals are perceptibly finer than in the 

 typical species as exemplified by specimens from both Celni and 

 the Sagami Sea, but this may l)e a varialde character. The dia- 

 meter ranimes from oS /^- to '>() /i. 



CRATEROMORPHA MEYERI RUGOSA Ij. 



PL lY., figs. 10, 11 ; PI. v., figs. 14, irK 

 C vieyerl var, rugom. Iji.afa, 'g8, p. 40. 



This subs2)ecies is established on the strength of five speci- 

 mens. One of these belonged to ^Ir. Alax Owston (O. C*. No. 

 G':)77) ; the rest are all in the Sei. Coll. Museum. The known 

 localities are Outside Okinose by the Iwado-line and Homba 

 (al)out 572 m.), each of which localities has thus far yielded two 



