28 BIOLOGICAL SURVEY OF 



CUMACEA 



LEUCONIDAE 



EndoreUa difficilis spec. nov. (fig. 14) 



Female : The general aspect of the body is in no way note- 

 worthy. The sinns above the anterolateral corner of the 

 carapace consists of a triangular indentation with two minute 

 teeth on its lower margin, below that a large tooth pointing 

 slightly downward. This is followed by a larger indentation 

 with a vertical, nearly straight, posterior margin and having 

 its lower margin formed by a tooth projecting slightly beyond 

 the upper margin. The anterior margin of the carapace is 

 serrate nearly to the top of the pseudorostral lobe. The in- 

 ferior margin bears about half a dozen saw teeth just behind 

 the anterolateral corner. The fifth pleon segment bears a 

 posterodorsal group of two or three setae about as long as the 

 segment. The pleon bears, in addition, a few short hairs. 

 The peduncle of the uropod is as long as the exopod and very 

 slightly longer than the first joint of the endopod. The sec- 

 ond joint of the endopod is about one-fourth the length of 

 the first joint. The apical spine is longer than the joint and 

 completely fused to it. The pereion shows distinct sculpture 

 composed of polygonal areas separated by raised lines. 



Male : I have seen no adult males. 



Length : Female, 5 mm. 



Type: Female, B163; paratypes. Crust. 1124 Boston Soc. 

 Nat. Hist. 



Remarks: This species most closely resembles E. nana 

 G. 0. Sars, but may be distinguished by the form of the sinus 

 and by the shorter second joint of the endopod of the uropod. 

 E. monodon Caiman has a middorsal tooth on the carapace 

 and the terminal spine of the endopod is distinct. 



In addition to the specimens collected by the Biological 

 Survey of the Mount Desert Region, I have also seen speci- 

 mens from Eastport, Maine, in the collection of the Boston 

 Society of Natural History. 



