no. 1651. REPORT 0^ THE OHTh'ACODA—SHAh'I'U. 423 



Shell smooth, more or less oblong or elliptical, and always with a 

 distinct rostral sinus. Both sexes present and with well developed 

 eyes. Frontal organ long and slender. First antenna 6 or 7 seg- 

 mented; in both sexes the fifth joint with a sensory organ; in the 

 female the terminal segment bearing only rather short seta?, while the 

 male bears two that are unusually long, almost as long as the entire 

 animal. Natatory branch of the antenna well developed; secondary 

 branch small in the female, sometimes jointed; in the male three- 

 jointed, the third joint reflexed upon the second, forming a grasping 

 organ. First maxilla without masticating process, in its stead a 

 group of long plumose setae ; main portion of limb falcate, with many 

 long, stiff setae on the inner margin ; in front a naked lamella arises 

 from the main limb. The second maxilla consists of a tongue-like 

 plate which is setose on its inner margin, and a large semicircular 

 lamina which bears many long plumose setae on its margin. The first 

 pair of legs arises directly behind the mouth ; not j ointed and without 

 lobes; bearing some plumose setae on the ventral margin. The vermi- 

 form limb has a double row of teeth at its extremity. Furca broader 

 than long, bearing several claws. There are seven pairs of rather 

 large dorsal branchiae. Sexual. 



It seems wise to follow the lead of Dr. G. W. Miiller in using the 

 genus name Cylindroleberis rather than Asterope for reasons very 

 well discussed by him in his splendid work on the Ostracocla of the 

 Gulf of Naples. 



26. CYLINDROLEBERIS OBLONGA (Grube). 

 Plate LXII, figs. 1-4. 



Cypridina marice Baird, Proc. Zool. Soc. London, 1850, p. 257, pi. xvn, figs. 



5-7. 

 Cypridina oblonga Grube, Archiv. fur Naturg., 1S59, p. 322, pi. xn. 

 Cylindroleberis marice Brady, Intellectual Observer, 1S67, p. 127, pi. n, 



figs. 11-14; Trans. Linn. Soc, XXVI, 1S68, p. 465, pi. xxxin, figs. 18-22. 

 Asterope oblonga Sars, Archiv. for Mathem. og NaturvicL, XXII, 1887, 



p. 31, pi. i, figs. 5-8 ; pi. ii, figs. 1, 2 ; pis. v, vi. 

 Cylindroleberis oblonga G. W. Muller, Die Ostraeoden des Golfes von 



Neapel, 1894, p. 219, pi. iv, figs. 14-18, 39, 41, 49-55; pi. v, figs. 1, 4, 5, 



13, 14, 33, 41-44 ; pi. vin, fig. 4. 

 Cylindroleberis marice Cushman, Proc. Boston Soc. Nat. Hist., XXXII, 



1906, No. 10, p. 366, pi. xxix, figs. 19-25.— Juday, Univ. of Cal. Pub., 



Ill, 1907, No. 9, p. 143, pi. xix, figs. 7-11. 



Dimensions. — Length, 1.45 mm. ; height, 0.8 mm. 



Seen from the side (fig. 1), the shell is nearly twice as long as high, 

 elongate, upper and lower margins nearly parallel, the greatest height 

 just back of the middle. Upper margin higher posteriorly, the lower 

 margin slightly sinuate anteriorly ; posterior extremity broadly and 

 evenly rounded. 



Rostral sinus oblique, narrow, situated below the middle. Surface 

 of the shell finely punctate, and yellowish red in color. 



