PACKARD. ] DEVELOPMENT OF BRANCHIPODIDZ. 429 
segments indicated show a diameter of 0.55™™ on the broadest part of 
the body, at the first pair of branchipeds. 
Streptocephalus texanus 
in the same stage of de- 
velopment (in an aqua- 
rium) of branchipeds and ° PRT ea duit “19 Fag di 
segments measures 0.8™™ 
in length and 0.43™™ in 
width. The first and sec- Fe ee 
ond pairs of antenne, of ? SS ae 
course, are also propor- 
tionally stouter in Hu- 
branchipus. 
The anterior antennz 
have (in the above stage) 
three hyaline flagellate 
bristles of 0.75™™! in 
length, which, after the 
third moult, are reduced 
j Fic.55.—Hubranchipus. a First bristle-hook of 2d antenna oflarva, 
considerably. 3 134™" long; b the same when older; d 2d bristle-hook of 2d antenna 
Shortly before the time of larva; ¢ one of the two middle bristles of mandibulary palpus. 
when the second antennse Pe va7- 
drop their long bristles the first four olfactory bacilli make their appear- 
ance at the side of the tip of the anterior antenne. 
The second pair 
of antenne agree Se eiuillee e e 
in general with 
those of Branchi- 2 
pus or Streptocep- 
halus. There is) ====>=>——== 
a basal hook bris- 
tle, first pl ain Fic. 56.—Sete of first maxilla of Eubranchipus. 
then ciliate (Fig.55 a) and then split. Second bristle-hook appears (Fig. 
5d d) to be triangular or rounded exteriorly, and two-edged and ciliate 
Fic. 57.—Anterior antenna of pale Eubranchipus mounted in gly- 
cerine osmic acid prep. From a specimen with three branchipeds 
budded, 1st of the latter with a single claw. 
interiorly. The terminal outer branch of the second an- 
tenna has fifteen long bristles and a terminal shorter one; 
the inner or posterior branch has three long and one short 
bristle. This branch is three-jointed; terminal branch is 
subjointed. 
First maxilla of adult Eubranchipus is plain, and has 
thirty-one long, flat, acinaciform bristles or teeth, equally long (Fig. 56.) 
The second maxilla is composed of a narrow, small, basal piece, with 
two strong, thick spines, each finely ciliate. 
