MUSEUM OF COMPARATIVE ZOOLOGY. 211 
On the hinder part of each branchial region there is a dark (in alcohol) ring 
of pigment. SS. ocellata Stimpson and S. penicillata Lockington are similarly 
ornamented. The flagellum of the antenna is banded alternately with light 
and dark color, and there are traces of color on the margins of the rostrum, the 
dorsal carine, and appendages. 
Peneus balboe, sp. nov. 
Integument thin and membranaceous, its surface thickly beset with minute 
squamiform tubercles. The rostrum of the sole specimen procured is broken 
off a little short of the anterior end of the eye; on the upper margin of the 
part remaining, and on the median line of the gastric region there is a series 
of eight slender acute teeth, three of which le behind the orbit. Rostrum 
continuous posteriorly with a sharp, non-sulcated carina which becomes 
obsolete before reaching the posterior margin. Suborbital angle prominent, 
but not armed with a spine; a small branchiostegian spine projects from the 
margin on a level with the second antenna. Neither the cervical nor any 
other grooves are apparent on the carapace. A faint longitudinal ridge runs 
along the side of the carapace on a level with the orbit; this carina is most 
conspicuous on the gastric region. Another longitudinal ridge runs from the 
suborbital angle, dividing into two branches near the middle of the carapace. 
A third ridge extends from the branchiostegian spine to the lower branch of 
the ridge last noted. Fourth, fifth, and sixth abdominal segments dorsally 
carinated, the sixth armed with a small horizontal spine. The fourth, fifth, 
and sixth segments are also ornamented with a lateral ridge. Eyestalks short ; 
eyes large, globular, black. 
Length, 93 mm. ; carapace, exclusive of rostrum, 29.5 mm. 
Station 3371. 770 fathoms. 1 female. 
Solenocera agassizii, sp. nov. 
Similar to S. siphonocera (Philippi), but different from that species in 
having the two antennulary flagella much shorter and subequal, and a larger 
number of teeth on the upper margin of the rostrum and gastric region. 
Comparison of a specimen fifty-seven millimeters long with S. siphénocera of 
equal size from the Bay of Naples shows that in the former the antennulary 
flagella are but four fifths the length of the carapace, and that there are eight 
teeth on the rostrum and gastric region, while in the Neapolitan specimen the 
antennulary flagella are as long as the distance from the tip of the rostrum to 
the middle of the third abdominal segment (two fifths longer than the cara- 
pace), and there are but six teeth on the rostrum and gastric region. More- 
over, not only is the upper flagellum broader (1 m.) and blunter in S. agassizii 
than in S. siphonocera (where it is only 4m. in breadth), but is also subequal 
in breadth to the lower flagellum, while in the Mediterranean species the upper 
flagellum is conspicuously narrower than the lower one. 
VOL, XXIV. — NO. 7. 5 
