120 MR J. T. CUNNINGHAM ON THE 



Div. IV. ACANTH. POLYNEMIFORMES. 



Fain. Polynemid^e. 



Div. V. ACANTH. SdiENIFORMES. 



Fam. 1. Sclenid^e. 



Div. VI. ACANTH. XlPHIIFORMES. 



Fam. 1. XiPHiiD^E. 



Div. VII. Acanth. Trichiuriformes. 

 Fam. 1. Trichiurid^e. 



Div. VIII. Acanth. Cotto-scombriformes. 



Fam. 1. Acronurid^e. 

 „ 2. Carangid^e. 



Capros, according to Day, was observed to shed pelagic ova by Mr Dunn 

 at Megavissey, July 20, 1882. 



Temnodon saltator, Linn. (Pomatomus saltatrix, Gill), is called the Blue- 

 fish on the Atlantic coast of the United States. Pelagic ova, believed 

 to belong to this species, are described by Agassiz in Pelagic Stages, 

 and a long larva, 9 mm. in length, identified as Temnodon, is figured in Young 

 Stages, pt. iii. pi. ii. The ova to which I have referred are, in one respect, 

 unique among all the kinds of pelagic ova hitherto described. In Agassiz's 

 own words, the egg exhibits a partial segmentation of the yolk — that is to say, 

 at the stage when the embryonic ring has just been formed, there is a ring of 

 definitely limited large cells round the edge of the blastoderm. After the 

 blastoderm has enclosed the yolk, the large cells seem to form a complete 

 envelope round the yolk beneath the blastoderm. To judge from the figures 

 given by Agassiz and Whitman, I should have concluded that in this species of 

 ovum the periblast, instead of being a syncytium, was divided into cells, and 

 should have been ready to agree with the view expressed by those authors in 

 their " Preliminary Notice" (Proc. Amer. Acad. Arts mid Sci., vol. xx.), namely, 

 that the actual cleavage of the yolk in this instance was positive proof that the 

 nucleated periblast in all cases, and the yolk, are " integrant portions of the 

 ovum." But in Pelagic Stages it is stated that closer examination has shown 



