DESClilPTlON OF A NEW SPECIES OF LIVONECA FROM 

 THE COAST OF PANAMA. 



By Harriet Richardson, 



CoUahondor, Division of Marine Invertebrates. 



The species to be described below was collected in Panama by Dr. 

 W. L. Jones in 1885, Tiie type and only specimen is in the collection 

 of the University of Pennsylvania. 



LIVONECA CONVEXA, new species. 



Bod}^ twice as long as wide, mm. : 18 mm. 



Head wider than long, 2 mm. long- : 3 mm. wide at the base. The 

 anterior end is 2 mm. wide and is roundl}' truncate. The posterior 



margin is widely rounded, with a slight indication 



of a small median lobe. The eyes are small, round, 



and vanishing, but still distinct. The first pair of 



antemue are separated ))y a distance of li mm. 



The}" are composed of seven articles and extend 



one-fourth the length of the 



first thoracic segment. The 



second pair of antenna? are 



composed of nine articles 



and extend to the middle of 



the first thoracic segment. 

 The first and fourth tho- 

 racic segments are each 



about H nun. long. The 



second and third segments 



are shorter than the first and 



fourth and are su1)equal, 

 eachjjeing 1 nun. in length. The last three are about equal in length 

 and are the longest, each being 2 mm. long. The epimera are pi-esent 

 on all the segments, with the exception of the first, and extend the 

 full lenoth of the lateral mariiins. 



Fig. 1.— Livoneca con 

 VEXA. ■: 3. 



Fig. 2.— Livoneca convexa. 

 Seventh leg. x 11^. 



Proceedings U. S. National Museum, Vol. XXIX— No. 1430. 

 Proc. N. M. vol. xxix— 05 29 445 



