PTET Re eR Ne or ke On he ee 
50 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
Still later it became evident that two sections could readily be 
distinguished within the genus which have since then been elevated to 
generic rank by Claus. Both these groups agree in several charac- 
ters, such as the following: Head distinct from the thorax, fourth 
and fifth thoracic segments closely united, frequently only the lateral 
or pleural portions of the latter being evident, abdomen composed of 
four segments in the male and three in the female, antenne shorter 
than the body, 24-(or 25?) jointed, right male antenna geniculate, in- 
ner rami of swimming feet, one-or two-jointed, in the female small, in 
the male prehensile. As restricted by Claus, the genera stand re- 
lated as shown by the following tabular diagnosis: 
Temora. 
Antenne of male 24 jointed, genicu- 
lation between joints 18 and 19. Max- 
illa and maxillipeds rather large. 
First foot with two-jointed inner 
ramus. 
Fifth feet one-branched, the left in 
the male three-jointed, dactylate, right 
two-jointed, unguiculate, in the female 
apparently two-jointed. 
Habit, marine. 
Sp. 1. T. longicaudata Lubbock (—T. 
jinmarchica Baird, etc.). Angle of last 
abdominal segment rounded, left foot 
of fifth pair in male three-jointed, with 
a long, immovable process on the first 
joint, the two remaining forming an 
apposable clasper, antennze as long as 
whole body. (North Sea.) 
Sp.2. T. armata Claus. Angle of 
last abdominal segment produced for- 
ward, left foot of fifth pair in the male 
with the terminal joint expanded into 
a plate, antenne reaching nearly to end 
of the abdomen. (Mediterranean. ) 
Sp. 3. T. dubia Lubbock. (As iden- 
tified by Brady.) Exactly as in T. ar- 
mata*, save that the antenne are said 
to be about as long as the cephalothorax. 
(Pacific and Atlantic Oceans. ) 
* The agreement is so close, even in minute 
details, that a varietal distinction at the utmost 
seems demanded. See Claus, Ueber die Gattun- 
gen Temora und Temorella, and Brady, Chaillen- 
ger Copepoda. 
Eurytemora. 
Antenne 24-(25?) jointed, genicula- 
tion between joints 18 and 19. Max- 
ile and maxillipeds quite short. 
First foot with 1-jointed inner ra- 
mus. 
Fifth feet one-branched, both three- 
jointed, the left with an expanded apex, 
the right with a strong claw, in the fe- 
male obviously three-jointed, the pen- 
ultimate segment bearing a strong spine. 
Habit sub-marine or fluviatile. 
Sp. 1. E. velow (Lillg.) Brady (=7. 
clausii Hoek). Penultimate joint of 
the fifth foot of female with a single 
spine externally, caudal stylets four to 
five times as long as wide and feebly 
spined. (Scandinavian and North Eu- 
ropean coasts. ) 
Sp. 2. EE. affinis Poppe. Last seg- 
mentof thorax produced. Penultimate 
segment of fifth foot in the female, with 
two spines externally, caudal stylets 
six to seven times as long as wide. 
Segmentation of last joints of male an- 
tenn more obvious. - (Same localities 
and rivers Rhine, Elbe, ete.) [See be- 
low on TZ. hirundo.| Poppe very posi- 
tively declares 7’. clausii to be identical 
with the 7. velox of Lilljeborg, but 
Claus explains that the male seen by 
Lilljeborg was 7. clausii. As identified 
by Brady, in England, 7. velox evi- 
dently corresponds to T. clausii, whhic 
should therefore probably yield priority 
to the older name. 
E. affinis occurs very abundantly in 
rivers and estuaries of, as well as in the 
Gulf of Mexico. 
Sp. 3. . lacustris Poppe. Last seg- 
ment of thorax rounded. Penultimate 
segment of fifth foot of female with two 
spines. Caudel stylets of female about 
as long as broad. From fresh-water 
lakes, Holstein, Sweden, Finland, ete. 
