398 bulletin: museum of comparative zoology. 



number of otocysts. But as no trace of gonads is yet to be seen on 

 the Bache specimens, identification can only be provisional. 



In the best specimen (the first in the above list) the bell is about 

 10 mm. high, with thick biconvex central disc, and narrow oval 

 lappets, exumbrella sculpture being limited to the latter. There are 

 four otocysts on most lappets, five on one, with the otoporpae about 

 as long as the lappets. The specimen 14 mm. in diameter has 2-4 

 otocysts per lappet, that of 12 mm., 2-3 only, each with prominent 

 otoporp. 



Pegantha dactyletra Maas? 



Pegantha dactyletra Maas, 1893, p. 47, taf. 5, fig. 1-8. 



IPegantha laevis H. B. Bigelow, 1909a, p. 97, pi. 16, fig. 1, pi. 20, fig. 4-6, pi. 27, 



fig. 1-7. 

 IPolyxenia cyanostylis Vanhoffen, 1908a, p. 54; 1912, p. 31. 

 ?Polyxenia cyanostylis Eschscholtz, 1829, p. 119, taf. 10, fig. 1; Haeckel, 1879, 



p. 330. 



Station 



10,200 surface 1 spec. 20 mm. in diam. 16 tentacles 



10,200 " 1 " 27 " " " 16? " 



10,203 " 1 " 31 " " " 16 " 



The specimens are in poor condition. 



Here again, as in the case of the series referred to P. clara (p. 397), 

 immaturity prevents positive identification; but the specimens agree 

 better with P. dactyletra than with any other of the genus. Thus they 

 all have the tentacle-number (16), low, rounded bell, smooth biconvex 

 disc, and short, broad, lappets described by Maas (1893); and I need 

 hardly add that a well-developed peripheral canal-system is clearly 

 visible. The number of otocysts per lappet likewise corresponds to 

 that of P. dactyletra (5-7) and its close relative (or synonym) P. laevis, 

 (1909a, p. 98); for while there are only from 2-5 per lappet each with 

 its otoporp, in the smallest Bache specimen, I was able to count eight 

 in one lappet of the largest.^ In all three specimens the future sexual 

 organs are represented by sixteen small, simple, rounded swellings, at 

 the margin of the stomach in the radii of the marginal lappets, already 

 supported by the gelatinous prominences so characteristic of this 

 genus. This is just what would be expected as the earliest stage in 

 the development of the complex gonad of P. dactyletra, in which, when 



' Both of the larger examples are in such poor condition that most of the otocysts are lost. 



