PACKARD.] DEVELOPMENT OF BRANCHIPODIDZA. A431 
No internal chitinous support is found until in the adult state, when we 
again meet with a flat chitinous plate, confined to the furca alone. It is 
-—-—-samaey 
Fig. 62. 
Fic. 61.—Female claspers; 6 more peculiar to the pale race. 
an interesting phenomenon to see that the red normal Lubranchipus 
has a white and the ale prace a red furca. The transparent, greenish, 
Chirocephalus holmani and the whitish Streptocephalus 
texanus have also a red furca. The red Hubrancht- 
pus occurs in brownish, clear water, the others in tur- 
bid, milky water. It may be an assistance in copu- 
lation, i. e., to make the individuals more visible, or 
conspicuous. Spangenberg (in op. cit. page 10) makes 
it more than plausible that the first (anterior) antenne 
PS 
tnt 
N 
Fic. 63.—Last few seg- Fic. 64.—Hubranchipus, red 9 larva, 13™™ long; 
ments of an Eubranchipus sides of head fimbriate above. From lite. Giss- 
laryaof13™™length. Cam- ler del. 
‘lucida drawing fr 
Toanted osmic acid pre, Of Branchipus are homologues of the leg, and I ven- 
a iar en aie DGS to compare the frontal tentacles in a similar 
integument (by the osmic manner. The following points support this theory : 
acid); i antcstine; 1) First, they are lateral appendages; second, their 
marginal, appendages, more developed exteriorly, 
closely agree with the embryonic development of the branchipeds, from 
a single mammiform process up to two and three of the latter. The 
frontal appendages are different in nearly every species of branchio- 
pod crustaceans; they are sometimes on the basal portions of the clasp- 
ers in the adult, or they are reduced to minute papillae. Dybowsky? 
calls them basal appendages, referring to the base of claspers, while 
Grube calls them more properly frontal appendages ; Fischer calls them 
cephalic tentacles (Middendorf’s Reisen nach Sibirien, Band IL); Verrill 
calls them lanceolate, ligulate, fleshy processes. 
\Archiy. fiir Naturgeschichte, 1860, Vols. 1 and 2, 26th Jahrgang: Beitrag zur Phyl- 
lopoden. Fauna der Umgebung Berlins nebst Kurzen Bemerkungen tiber Cancer pal- 
udosus Miiller von B. von Dybowsky, M. D., page 195, Taf. X. 
