336 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



What these ''lames plates" could be would furnish something of a 

 puzzle to the comparative anatomist. 



Hesse then adds, under what he is pleased to call " Physiologic " : 



J'ai d'abord exprime I'opinion que cet embryon pourrait bien etre un male qui, 

 joint a une femelle adulte, douee consequeminent de moyens de locomotion plus 

 puissants que les siens, pouvait I'entrainer sur un autre poisson et aller ainsi, avec 

 lui, fonder une autre colonie et contribuer par la a favoriser la reproduction et la 

 dissemination do I'espece (p. 31). 



That is to say, a male, which is free swimming in all the Nogaus 

 species, attaches itself to a female, which in every species of the 

 Pandarinae is fixed and helpless, in order to facilitate its locomotion 

 from one fish to another. 



Since in a description of this sort there is no hint of the family, 

 to say nothing of the generic position of the larva, we are compelled 

 to set it aside entirely and to get our knowledge of the development 

 of the Pandarinae from original sources. 



THE NAUPLIUS as seen in the genera Nesippus and Pandarus. 



Body an elongate ellipsoid, evenly rounded in front, but some- 

 what contracted posteriorly through the bases of the balancers. 



^^^ The three pairs of ap- 

 pendages are bunched 

 rather closely at the 

 anterior end and are of 

 the usual pattern. The 

 balancers are fully one- 

 third the entire length 

 of the body, differing 

 markedly in tliis re- 

 spect from those found 

 in the preceding sub- 

 families. In the Nesip- 

 pus nauplius they take 

 the form of simple, 

 slightly curved, and 



p^(j.5._A NEWLY HATCHED NAUPLIUS OF Nesippus ALATUS. aCUmmatC SpineS, in 



the Pandarus nauplius 

 they are slightly S-shaped, with a double curve and contracted at 

 a point one-fourth of their length from the base, as though jointed. 

 In Nesippus the color is a uniform grayish brown, with a broad, 

 transparent, and colorless margin, and without pigment spots or 

 other markings. (See fig. 5.) In Pandarus the center of the body is 

 olive green by transmitted light, appearing cinnamon-brown by 

 reflected light in the egg strings, or even almost black. 



