622 



YAICII1RÔ OKADA : 



The Okinawa specimen is peculiar in that it is of a violet colour 

 and is in shape infundibuliform, passing below into a short peduncle, 

 and in the zooecial aperture being provided with a thin and entire 

 (not dentate) peristome. 



The Sagami Sea specimen, on which Ortmann based the species, 

 was without ooecia. In all the specimens now before me the ooecia 

 are present in abundance. The ooecial aperture in ventral view is 

 commonly of the configuration shown in (textfig. 3 h), there existing 

 on the lower ooecial margin a Fig. 3. 



pair of well developed peaks 

 which divide the upper parts 

 of the aperture into three 

 broad recesses, a median and 

 two lateral. Not infrequently 

 one meets with interesting 

 variations in the development 

 and arrangement of the ooecial 

 aperture. The median recess 

 may de entirely cut off from 

 the main aperture, apparently 

 by fusion of the two peaks into one, and may then appear as a small 

 and isolated perforation of a slit-like, obovate or circular form 

 (c-g). The longitudinal line of fusion of the peaks may or may not 

 be indicated by a ridge-like thickening of the test, which thickening 

 is continuous with the thickened lip of the isolated perforation. At 

 other times, the median recess presents a spatulate form, connected 

 with the remaining portion of the aperture by a narrow stalk-like 

 part (/). Conjointly with the above variation, the lateral recesses 

 may be developed assymmetrically in regard to their relative size in 

 a pair (e) or in that they occur unilaterally in a single number 

 (i-e). The simplest cases sometimes observed of ooecial apertures 

 were those in which these, in ventral view, were of a simple 



Fig. 3. The ovicell of Retcpora axillaris 

 Ortmann showing the various state of its 

 aperture. 



