98 BULLETIN OF THE 
A single specimen of this species, the only one as yet known, was taken at 
Station 305, Lat. 32° 18’ 20” N., Long. 78° 43’ W., from a depth of 252 
fathoms. 
Rocinela Americana Scuiépre & Meryert. 
Plate III. Figs. 3, 3a, 4. Plate IV. Figs. 2,2a 
Rocinela Americana Scui6pTE & Mertnert, Naturhist. Tidssk., R. II., B. XIL, 
p. 394, Pl. X. (Cym. IV.) Figs. 16-18. 1879. 
Two specimens of this species were obtained at Station 320, Lat. 32° 33’ 15’ 
N., Long. 77° 30’ 10” W., from a depth of 257 fathoms, and a considerable 
number of other specimens obtained at various localities by the U. 8. Fish 
Commission enable me to add somewhat to Schiddte and Meinert’s description 
of the species, which was drawn from a single female specimen. A comparison 
of their type, from Trenton,* Maine, now preserved in the Museum of Com- 
parative Zodlogy at Cambridge, and kindly loaned for the purpose by Pro- 
fessor Agassiz, shows no differences that can be regarded as specific. 
The body is oval, with the length more than twice the breadth, and nearly 
all of our specimens are proportionally broader than the type, although none of 
them are quite as large. 
Head subtriangular, rounded behind, acutish or slightly produced in front, 
more distinctly produced and somewhat angulated in front in the males (Pl. 
III. Fig. 4). Eyes rather large, separated by about one quarter the diameter 
of the head, rounded behind, more or less angulated at the point of nearest 
approach, where, in the males, a distinct angle of a hexagon is seen at the 
meeting of two rows of nine and six ocelli along the inner margin of the eye, 
one ocellus at the angle being common to both rows. 
The antennule, when reflexed, only slightly surpass the head, and the flagel- 
lum is composed of five or six segments, of which the first is not much elon- 
gated and the last nearly attains the end of the antennal peduncle. The 
antennee nearly attain the hinder margin of the second thoracic segment ; the 
first and second segments are very short and concealed by the projecting front ; 
the flagellum is as long as the peduncle, and composed of about fourteen seg- 
ments. 
The first thoracic segment is slightly excavated for the ocular lobes of the 
head; epimera of second and third segments subquadrate, oblique but not acute 
behind, marked with an impressed line near the lower margin; remaining four 
epimera acute and moderately produced ; last epimeron usually surpassing the 
first segment of the pleon, although in some of the larger females, as in the type 
specimen, it fails to do so. 
Prehensile legs (Pl. IV. Fig. 2) armed with three acute spines on the palmar 
margin of the propodus, and three obtuse spines on the same margin of the 
* Trenton is incorrectly printed “Ireston” in Schiddte and Meinert’s paper. 
