240 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
lateral row of scales; terminal claw with asmall spine. The shell is 
ornamented with fine, close, longitudinal striations. Length 0.9 mm. 
Alona elegans is very near to this and should have followed. In August, 
1878, I took an Alona marked as in A. sanguinea and agreeing with 
Mueller’s description in all points which can be verified in the draw- 
ing. ‘The small size of the eye is remarkable for so large an animal. 
I have never again seen this species; it seems to be very rare here and 
in Europe. 
Alona moniezi Richard. 
Richard ’88. 
““Testa antice quam postice latior, striis multis, interdum areis ornata, supine sat 
arcuata, postice fere truncata, angulo inferiore rotundato, inferne subrecta, ciliis 
longis, hic obsita. Antennz 1mi paris apicem rostri fere attingentes. Articulus 
ultimus utriusque rami antennarum 2 di paris, setis 5 longis et aculeo forti preditus. 
Rami exterioris articulus penultimus longa seta instructus. Macula nigra oculo 
major, inter hunc et apicem rostri in medio sita. Post-abdomen breve latitudine fere 
zequali, ad angulum posteriorem et inferiorem rotundatum, seriebus (8-9) aculeorum 
(4-5 quorum exterior multo major) fusiformium, preeterea aculeis minutis seequalibus 
fasciculatim usque ad processum obtusum positis, armatum. Adest denique series 
lateralis squamarum spinis gracilibus ac longis compositarum. Ungues terminales 
sat longi, usque ad apicem ciliis minutissimis obsiti, dente basli gracile, et sat magna. 
Sete abdominales longze. Mas femina majore paulo dicrepans. Postabdomen brevius, 
latum, spinis unguibusque terminalibus multo brevioribus quam infemina, ornatum. 
Pedes 1 mi paris in hamulo valido curvato ad basin crasso, apicem versus acuto ex- 
euntes. Longit. fem., 0.5-0.55 mm.; mas., 0.45--05 mm.’’ 
Found near Vichy. 
* Alona quadrangularis Miiller. 
PLATE LXI, Fies. 1, 2. 
Alona oblonga—P. E. Mueller. 
Alona affinis—Leydig. 
Alona suleata—Schoedler, Hudendorff. 
The group of forms included under the above names is in inex- 
tricable confusion. Hellich evidently describes the same species as 
quadrangularis and affinis. A ffinis falls little short of one millimeter in 
length while quadrangularis is less than 0.75 mm. A. oblonga is said by 
Kurz to measure 0.8 to 0.9mm. He, however, did not know A. affinis. 
Hellich says that there is a secondary marking of the shell in A. affinis. 
The claws are smooth in quadrangularis and ciliate or toothed in affnis. 
Statements of various authors differ respecting the relative size of eye 
and pigment fleck. 
The American form, which most closely approaches affinis, has the 
claws denticulate and the pigment fleck smaller than theeye. In the 
figure (Plate LXIV, Fig. 14) the head is somewhat protruded by 
4 fhe! ee 
