388 bulletin: museum of comparative zoology. 



general form they agree very closely with adult specimens from 

 Naples. The ribs now extend over about two thirds of the body, and 

 none of the meridional branches anastomose. But the meridional 

 net is still far less complete than in the adult, and the gastric net is 

 still represented by a few branches, and occasional stolons which 

 connect the gastric and meridional systems. The most important 

 advance is in the sexual diverticula from the meridional canals, 

 which have now reached practically the adult condition. It is inter- 

 esting to note that the sexual lobes extend to the ends of the canals, 

 i. e., nearly to the mouth, although the paddle-ribs cover only about 

 two thirds of the length of the canals. This, as noted above, was fore- 

 shadowed in the younger specimen. Chun ('80, p. 309) says that the 

 formation of sexual products ceases at the ends of the ribs; but this 

 statement is true only in the adult, where the ribs extend over four 

 fifths or more of the length of the canals. 



Beroe forskalii has been recorded from Fiji, from the coast of Cali- 

 fornia, and from various localities among the Malay Islands; and the 

 present captures show that it is widely distributed, though apparently 

 not very common, in the eastern part of the Tropical Pacific. It is 

 also recorded by Maas ( : 08) from the Antarctic. Although his 

 material was not in the best of condition, it showed clearly that the 

 gastric canals were branched, a fact separating it definitely from 

 B. cucumis, which is the representative of the genus which might 

 have been expected in that region. The specimens likewise agreed 

 with forskalii in form, but it is better not to lay too much stress on 

 this character in preserved specimens. Unfortunately Maas could 

 not determine the arrangement of the gonads, which is the most 

 important feature separating forskalii from ovata. A fresh examina- 

 tion of the Beroes of the Antarctic would be valuable, because apart 

 from this one record, B . forskalii is known only from warm and tem- 

 perate regions. 



Pandora Eschscholtz. 



The genus Pandora, merged with Beroe by Chun and by Mayer 

 (: 12), has been reinstated by Moser, to include those species which 

 agree with Beroe in anatomy, but in which the ribs are of unequal 

 length. This difference is, of course, a slight one. But the diversity 

 in the length of canals, in forms in which it occurs, is present in the 

 earliest stages in which any of them are known, while, on the other 

 hand, all the ribs in Beroe are nearly or quite of one length from the 



