REPORT ON THE AMPHIPODA. Ill 



thick hand, all the feet with only one claw. Rump with four large segments, without 

 lateral appendages, but with the usual ones beneath. Tail with short and recurved 

 , appendages. — It belongs to the family gamiiuiria, the name was that of an ancient fluviatile 



God of Thessaly. 



" 39. Spercliius Lucidus. Shining brown, eyes blaclc, nearly round ; appendages of the tail 

 shorter than the last article, curved outwards, with two articles and a teriuinal filament. 

 Discovered in the springs and brooks near Lexington, Ky. Length about one-third of an 

 inch, almost black when in the water, olivaceous brown when out of it, and pale when drj^ 

 Body arched, antenna descending. It swims well. 



" iv. N. G. Lepledeus. Four antenna shorter than the head, nearly equal, truncate, with a 

 single segment. Body rather compressed and straight, with twelve segments, all with a 

 large lateral scale except the three anterior and the last, posterior segments and scales longer. 

 First pair of feet with a large oblong cheUform and cuspidate band ; the second and third 

 pair cylindrical pinciferous or with two cylindrical and truncate fingers, the four other 

 pairs slender ; all the feet without real claws. Appendages beneath the rump almost similar 

 to the hind feet ; those of the tail short and with single segments. — Another fresh-water 

 genus of shrimps, of the family Gammaria. The name means lateral scales. 



" 40. Lepleurus Rivularis. Olivaceous, eyes very faint irregular ; appendage of the tail truncate 

 straight obliqual ; antenna nearly horizontal, feet longer than the breadth of the body. — I 

 have detected it in the brooks of the mountains of Pennsylvania and at iShannon run, near 

 Bedford Springs. Length about half an inch ; it crawls on the stones rather than swims or 

 jumps." 



He then describes the new genus Lirceus in the family Oniscia. His remaining Classes are, 

 Entomia, the Insects ; Helminthia, the Worms ; Apalosia, the MoUusca ; Polypia, the 

 Polyps ; Porostomia, the Porostomes. 



Desmarest objects to the name Sperchius as too near to the Sperclimis of Fabricius, among the 

 Coleoptera. Neither Sperchius nor Lepleurus has yet been identified. In the descriptions 

 of both there are perplexing obscurities. The short antennse of Lepleurus are suggestive of 

 Hyalella, but the identification must be left to naturahsts in Kentucky. 



1820. ScHLOTHEiM, Ernst Friedrich, Baroii von, born 1765, died 1832. 



Die Petrefactenkuude auf ilirem jetzigeu Staudpuukte durch die Beschreibung 

 seiner Sammlung versteinerter und fossiler Uberreste des Thier- und Pflauzenreichs 

 der Vorwelt erliiutert. Gotka, 1820. 



At page 41 he gives " 5. Trilobites problematicus. Aus Hohlenkalkstein von Gliicksbrunn, der 

 Gebirgsart aufstiegend. 



"Hcichst wahrscheinlich gehijrt dieses kleine sonderbare Geschcipf ebenfalls zu den Trilobiteu. 

 Leider ist es etwas verdriickt, librigens aber fast ganz vollstandig erhalten. Es ist krumm 

 zusammengebogen, aber die Schilder siimmtlich sehr flach, bios der Riicken wenig gewolbt. 

 Die Kopfbuckeln sind klein und stehen ziemlich eng, nach dem vordern Rande des Brust- 

 schildes zu, zusammen, in der Mitte wieder etwas vertieft, das Kopfschild verhaltnissmasig 

 sehr schmal, und die Riickenschilder am Seitenrand mit kleinen Strichen gesaumt. Nur 

 erst bey der Auf-findung recht voUstandig erhaltener Esemplare wird sich ausweisen, ob er 

 wirklich zu dieser Familie gerechnet werden muss, womit er aUerdings grosse Ahnlichkeit 

 zeigt." See note on Schlotheim, 1822. 



