PACKARD.] 



DEVELOPMENT OF BEANCHIPODID^. 



431 



No internal chitinous support is found until in the adult state, when we 

 again meet with a fiat chitinous plate, confined to the ftirca alone. It is 



rig. 62. 



Fig. 61. — Female claspers ; 6 more peculiar to the pale race. 



an interesting phenomenon to see that the red normal Bubrancliipus 

 has a white and the ale prace a red/wrc«. The transparent, greenish, 

 Chirocephalus Jiolmani and the whitish Streptocephalus 

 %^-uii texanus have also a red ftirccL The red EubraneU- 

 J 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) antennse 



Fig. 63.— Last few &eg- 

 ments of aiiEubraiicliij)us 

 larvaofli""" length. Cam- 



FiG. 64. — Eubranchipvs, red $ larva, 13""™ long; 

 sides of head fimbriate above. From life. Giss- 

 ler del. 



mounted osmic acid pre- of Brauchipus are homologues of the leg, and I ven- 

 paration.ps, fifth pair o||;uj.e to compare the frontal tentq^cles in a similar 

 inte^melt^(b^theT8m°io manner. The following points support this theory : 

 furcl'ki?iti:^Glslilr'de^: First, they are lateral appendages 5 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 paxjillse. 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 Eeisen nach Sibirien, Band II) ; Verrill 

 calls them lanceolate, ligulate, fleshy processes. 



lArcMv. ±ur Naturgescliiclite, 1860, Vols. 1 and 2, 26tli Jahrgang: Beitrag ziir Phyl- 

 lopoden. Fauna der Umgebung Berlins nebst Kurzen Bemerkungen iiber Cancer pal- 

 udosus Miiller von B. vou Dybowsky, M. D., page 195, Taf. X. 



