DIPHYES. 37 



Nectocalyx not more than one quarter of an inch long. 



This obviously young and imperfect Dipliyes was taken only once in the Indian Ocean, 

 to the south-east of Mauritius, May 27th, 1847. 



DiPHYES KOCHII. 



Diphyes Kochii, Will, 1844. 

 Muggima pyramidalis, Busch, 1851. 



Will, in his ' Horae Tergestinge,' 1844, describes and figures a Diphyes Kochii, which he 

 found in the Adriatic, and which appears to resemble the form just described in many respects. 

 However, it differs from D. mitra in the gradual widening of the nectosac towards its lower 

 end, so that the nectocalyx does not exhibit the peculiar inferior narrowing characteristic of 

 B. mitra. All the specimens of D. Kochii examined by Will were devoid of a distal nectocalyx, 

 and the proximal nectocalyx was not more than a line and a half long. 



I am inclined to suspect that both D. Kochii and ray B. mitra may be the young of 

 B. appendiculata} The Muggicea pyramidalis of Busch (' Beobachtungen ueber Anatomie and 

 Entwickelung einiger wirbelloser Seethiere,' 1851) is identical with Biphyes Kochii. 



^ Gegenbaur's account of the development of D. appendiculata, to which I have referred at p. 23 

 (see also Pi. V), shows that the nectocalyces of this species must undergo a very considerable change 

 of form iu the course of their development. 



