( --^5 ) 



antenual plates longer than rostrum, apical spine acute ; antennae slender, 

 long, reaching to base of telson, epistoma much wider than long, truncate, 

 raaxillipedes barbate on inner side and below : inner margin of hand and 

 movable finger with two rows of teeth, contiguous margins of fingers tuber- 

 culate, exterior one hairy at base, both fingers ribbed and punctate above , 

 third joint of third thoracic legs hooked; first abdominal legs long, bifid, 

 nearly straight, exterior part longer, recurved, interior part recurved, ob- 

 tuse, not enlarged near apex, tubercles on inner basal angles small. This 

 species resembles the above, but differs from it in having a wider, more con- 

 cave rostrum, with parallel sides, a depressed dorsum, wider epistoma, more 

 coarsely bearded maxillipedes, longer abdominal legs, and the absence of 

 enlargement near apex of interior part. Habitat : Baraboo river, Ironton ; 

 Wisconsin river, Sauk City, Wisconsin. 



Eubranchlpits Lundi/)', Forbei<. This species, sent me by my friend 

 Prof. Bundy, w^as taken by him at Jefferson, Wis. The specimens seen 

 were somewhat smaller than average individuals of E. serratus, the thorax 

 shorter and the abdomen more slender. The latter is similar to the abdo- 

 men of E. vernalis, while the claspers and frontal appendages are more like 

 those of E. serrattis. 



The antennae extend abi ut one-third their length beyond the eyes. 

 The frontal appendages are long and narrow, widest at base and regularly 

 tapering, serrate within and on outer margin of tip with short blunt even 

 teeth. The under surface is covered with short blunt spines or tubercles. 



These appendages are attached by a transverse line to the front of 

 the head, just within the base of the claspers, and are about three times as 

 long as the basal joint of the latter. 



The claspeifs resemble in size, general form and position those of E. 

 serratiis. The tubercle at the base of the first joint is larger and situated 

 farther forward, extending far enough to the front to meet its fellow of the 

 opposite side before the labrum. The opposed edges are somewhat rough- 

 ened. The labrum is large and extends forward in the form of a stout 

 tubercle, truncate at its extremity. This process is embraced by the con- 

 cave posterior internal margins of the basal tubercles of the claspers The 

 second joint of the clasper is thick at base, but tapers more rapidly than in 

 E. serratus. The long and slender tooth of the latter is replaced by a thick 

 rounded tubercle extending directly inward and covered by elevated disks, 

 f>r truncate papillae, like the tip of the tooth in the species just mentioned. 

 Unlike the latter, these papillae arc wanting at the tip of the joint, which is 

 expanded and distinctly bifid. 



The margins of the abdomen are not distinctly serrate, the last segment 

 is not connate with the penultimate, nor is the tip of the abdomen broader 

 than the preceding segments. 



The caudal sh/lefs are broad and blunt, not rounded at base, usually a 

 little longer than the last three abdominal segments, and ciliate their whole 

 length. The ovisac of the female is nearly as broad as long, with a large 

 median lobe behind, and no other posterior processes. 



