MUSEUM OF COMPARATIVE ZOOLOGY. 211 



On the hinder part of each branchial region there is a dark (in alcohol) ring 

 of pigment. S. 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 carinse, and appendages. 



Peneus balbose, sp. nov. 



Integument thin and membranaceous, its surface thickly beset with minute 

 squamiforni 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 lie 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. siphonocera of 

 equal size from the Bay of Naples shows that in the former the antennulary 

 1 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 ^ m. 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 



