fSO Orust. 
CRUSTACEA. 
half-moon shaped spermatozoids, described j Gruber & Weismann, Verb, 
nat. Ges. Freib. vii. pp. 50-116. 
Moina fischeri^ new name tov Daphnia rectlrostris (Fischer, nec 0. F. 
Miill.), Hellich, Arch. Land. Bohm. iii. sect. 4, pt. 2, p. 55, with wood- 
cut, Bohemia. 
Pasithea rectirostris (O. F. Miill.). Male described by Gruber & 
Weismann, Verb. nat. Ges. Freib. vii. p. 50. 
Lathonura Umnai (King, 1853, as Molna)^ Australia; SchCdler, SB. nat. 
Fr. 1877, p. 14. 
Macrothrix laticornis^ Claus, Benk. Ak. Wien, xxxvii. p. 150, pi. vii. 
fig. 24, female ; Weismann & Gruber, Verb. nat. Ges. Freib. vii. p. 50. 
Bosmina longirostris (Miill.), head and cervical organ figured by Claus, 
1. c. p. 151, pi. iv. fig. 9. 
Bosmina longispina (Leydig) in the Lake of Constance ; A. Weismann, 
Thierleben des Bodensees, p. 14, pi. i. fig. 5. 
Bosmina brevicornis and bohemica, spp. nn., Hellich, Arch. Land. Bohm 
iii. sect. 4, pt. 2, pp. 60 & 61, the former with woodcut, Bohemia. 
LyNCEID2B. 
Chydorus punctatus, sp. n., Hellich, Arch. Land. Bohm. iii. sect. 4, 
pt. 2, p. 110, with woodcut, Bohemia. 
POLYPHEMIDJl. 
C. Claus reviews the whole organization of this family, in comparison 
with that of Leptodora and the Daphniidce : the shell is transformed into 
a uterus-like sac, the abdomen is reduced, only three segments being 
present in Bythotrephes, and no visible segmentation of it in Polyphemus ; 
the number of feet is reduced to four pairs, and all are prehensile ; the 
male is distinguished in all genera by a hook at the terminal joint of the 
first pair. The ventral string of the nervous system, the enormous eye, the 
intestinal tract, and the considerable corpus adipo.sum, the shell-gland, 
the shape of which is different in Podon^ Evadne^ and Polyphemus^ and 
the function of which is perhaps that of a kidney, the so-called sucker 
on the neck, which really is a gland, the organs of circulation and 
respiration, and finally the generative organs, remarkable by the smallness 
of the ovary, the large uterus with thick walls, the peculiar nutritive colls 
in the egg, and the sexual differences, are comparatively described and 
discussed. Denk. Ak. Wien, xxxvii. pp. 137-160, with 7 plates. 
A. Weismann opposes the opinion of Claus, that in Evadne and Podon 
the walls of the breeding sac yield nourishment to the eggs ; Z. wiss. 
Zool. XXX. pp. 194-202. 
. Polyphemus oculus (Miill. ? ?, Leydig), probably distinct from the more 
common pediculus (De Geer); Schoedler, SB. nat. Fr. 1877, pp. 232 & 
233. Female figured by Claus, 1. c. pi. iii. fig. 7. 
Bythotrephes longimanus (Leydig), from Lake Constance, and ceder- 
stroemi (Lillj.), from Sweden, specifically distinct by the form of the 
caudal spine ; Schoedler, 1. c. pp. 233 & 234. Observed in Lake Con- 
