Navieularca.'] INFirsORIAt ANIMAtCTTLES. 369 



venter slightly concave, minutely striated ; ends suddenly contracted 

 and produced ; approaches E. Diarue. (l-480th.) 



EcTNOTiA Arr/us. — Striated, dorsally oblong, regulai-ly quadrangular, 

 with a double row of pores (ocelli), approaching it to E. ocellata, 

 ■which however is constricted towards each extremity. Cuba, 

 Mexico. (P. 24. f- 11.) 



E. biceps. — Striated, narrowly linear, curved, apices roxmded ; and 

 a little revolute. North America and Falkland Islands. 



E. bidens — Striated, ; venter flat ; dorsum convex, wdth a central 

 furrow, rendering it bidentate ; apices dilated, truncate. It resembles 

 E. diodon, except in its truncate extremities. America. 



E. Camelus. — Small, striated ; dorsum with a double boss or hump ; 

 extremities produced, slender, obtuse. Cayenne and Labrador, 



E. (?) cingulata = Epithemia cingulata (Kiitz.) — Smooth, small, 

 dorsum convex ; margin of ventral surface tumid. It is divided by 

 a longitudinal prominent band into two halves; approaches E. 

 gibberula 



E. decUvis. — Wider, striated; venter flat; dorsum convex, with a 

 moderate groove, making it bidcndatc ; the dentations continuoug 

 with the acute apices by a straight descending line. 



E. de2)ressa. — Striated ; nail^wly linear, rectangular ; venter 

 plane or slightly concave; dorsuna rather depressed, suddenly 

 contracting towards the rounded apices. Length I-408th. Eossil, 

 Ireland, and in tropical America. 



E. dki/ga. — Striated (?) wider; venter concave ; dorsum convex, 

 with four dentations, approximating at the centre, Cayenne. 



E. JElephas. — Striated, very broad curved, apices broadly rounded ; 

 back tridendate. Brazil. 



E. Formica. — Stiiated, Knear ; turgid on each side of the centre, 

 apices also enlarged. It = E. nodosa, with ends not reflected, but 

 enlarged and straight Central and North America. 



E. gibberula = Epithemia gibberula. (Kiitz.) — With dotted strife, 

 smaU; dorsum widely expanded; apices constricted, recurved. 

 Mexico, Connecticut. 



E. Lihrile = Epithemia Librile (Kiitz.) — Long and narrow, with 

 dotted interspaces between the sti-ise ; venter concave ; dorsum at its 



