578 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 108 



Nymphozoon, new genus 



Definition: Pseudoceridae with multiple female apparatuses, 

 arranged in a mid ventral longitudinal row; sucker wanting; otherwise 

 as in Pseudoceros. 



Type species: Nymphozoon bayeri, new species. 



Nymphozoon bayeri, new species 



Figures 116,c; 12a,b 



Material: Two specimens were taken by the Stanford team, one 

 on a reef flat at Iwayama Bay, Palau Islands, Sta. 133, Aug. 28, 1955; 

 the other on shallow coral sand and eel grass in the same region, 

 Sta. 85a, Oct. 29, 1955. 



General characters : This is a very large, handsome, black-and- 

 white pseudocerid of delicate consistency. The larger specimen is 

 70 mm. long by 55 mm. wide, preserved, the smaller one 50 mm. by 

 30 mm. From the ruffling of the margins one may surmise that a 

 considerably greater length may be attained in life. A photograph of 

 the smaller specimen in life shows it to have been about 75 mm. long. 

 The shape is broadly oval tapering to a somewhat pointed posterior 

 end (fig. 12a); anteriorly there are present the usual tentacular folds. 

 Figure 12a attempts to depict the striking color pattern. There is a 

 narrow, very black, sharply delimited band along the margin that 

 also edges the tentacular folds. Medially there is a moderately broad 

 black longitudinal band that tapers to a point behind the tentacular 

 folds and narrows posteriorly, but it could not be followed completely 

 here because of dam^age. Between the median band and the margin 

 there is present on each side a broad lateral band of grayish black hue 

 that also could not be followed to the posterior end. The remainder 

 of the animal is pure white. The large ruffled pharynx with central 

 mouth is drawn in figure 126. The smaller specimen is definitely 

 devoid of any indication of the reproductive system but the larger 

 specimen is fully matm'e. As shown in figure 126, there is a pair of 

 male pores behind the pharynx and this is succeeded by a midventral 

 longitudinal row of eight pores, som.ewhat unevenlj' spaced. The 

 nature of these pores could not be ascertained without sections and 

 these showed that they are female gonopores. A sucker is definitely 

 wanting. Bayer took a clear kodachrome of the smaller specimen in 

 motion viewed from the ventral surface; the lack of a sucker is at 

 once noticeable. 



CopuLATORY apparatus: It was unfortunately necessary to remove 

 the anterior median part of the larger specimen for sectioning, as the 

 nature of the row of midventral pores could not be determined other- 

 wise. The sections showed the details of the male apparatuses and 



