NO. 1591. SCHIZOPODS FROM ALASKA—ORTMANN. i) 
joint of outer branch of fourth pleopod of male with a single 
stout terminal spine. Antennal scale lanceolate or ovate. 
f’. Outer branch of fourth pleopod of male projecting only with the 
terminal spine beyond inner branch; distal joints not at all in- 
creasing in length. ‘Telson triangular, apex truncate or cleft. 
Mysidopsis Sars.@ 
7’. Outer branch of fourth pleopod of male distinctly projecting be- 
yond the inner, distal joints slowly increasing in length. ‘Tel- 
son triangular, apex with a short cleft_____-__Mysideis Sars.? 
dd. Outer margin of antennal scale not setose, ending in a spine near the 
distal end. ‘Terminal joints of inner branch of fourth pleopod of 
male increasing in length, especially the last one greatly elongate, 
and bearing a spine at its end. Telson elongated-triangular, apex 
CIGUIT CAST Ot Cle Tete ee a en ee SN Holmesiella, new genus. 
ce. Pleopods of female: biramous, although rudimentary. Outer branch of 
third pleopod of male much elongated. Outer margin of antennal scale 
not setose, with terminal spine. Telson subrectangular, 2-8 times as 
long as wide, outer margin spinous, spines remote proximally, but more 
close set distally; apex slightly emarginated, emargination spinous. 
Callomysis Holmes.¢ 
Genus HOLMESIELLA Ortmann, new genus.¢@ 
Diagnosis—A genus of Mysidae, belonging to the subfamily Lep- 
tomysinae. Body of the usual form. Eyes large. Third joint of 
peduncle of antennulee in the male with a strong conical process on 
the lower side of the distal extremity. Legs slightly setose, with the 
propodite triarticulate, dactylopodite short, with a long, curved, termi- 
nal spine. Marsupial pouch of female consisting of three pairs of 
leaflets, the anterior small. Pleopods of female all rudimentary, short 
and simple. Pleopods of the male all biramous, but in the first pair 
the inner branch is short and simple; in the second, third, and fifth pair 
both branches are well developed, of about the same length, and mul- 
tiarticulate; in the fourth pair it is the inner branch that is much 
elongated, about twice as long as the outer. The terminal joints in- 
crease in length, and especially the last one is much elongated, almost 
three times as long as the penultimate, and carries at the distal ex- 
tremity a long and strong spine. The three last joints do not possess 
any sete. Telson elongated, triangular, apex truncated, margins 
spinulose. Uropods narrow; otolithe well developed. 
“Sars, Monogr. Mysid., II, 1872, p. 12; Norman, Ann. Nat. Hist. (6), X, 1892, 
joy aes, 
’ Sars, Idem, III, 1879, p. 1. 
¢ Holmes, Proc. California Acad. Sci. (2), IV, 1895, p. 582. 
4 Named in honor of Prof. S. J. Holmes, in recognition of his work on Pacific 
Crustaceans. 
