studios on marine Ostracods G77 



differences are, however, so many tliat tlie unity of the Bisfinosa group would be weakened 

 very essentially and its characterization rendered difficult, if these two forms were to be included 

 in it. It seemed accordingly most convenient to distinguish them as a special group. 



Conchoecia Gaussi G. W. MOller. 



Conchoecia Gaussi, G. W. MUller, 1908, p. 71; pi. IX, figs. 14—16; pi. X, figs. 9—12. 

 „ ,, „ „ 1912, 13. 80. 



Description: — See G. W. MItller, 1908, p. 71. 



Supplementary description: — Female: — 



Shell: — Length: 3,6 mm. Length : height about 2:1; length : breadth about 

 2,45 : 1. Seen from the side (see the accompanying fig. 1) it is of about the same 

 type as that of the male. Seen from below (see the accompanying fig. 2) it has its 

 greatest width at about or just in front of the middle and has the anterior part of the shell 

 somewhat larger than the posterior part; the side contoui-s are evenly curved, the anterior end 

 is broadly rounded, the rostrum is symmetrical and the posterior end is pointed. The shoulder 

 vault is only weakly developed and is rounded. The surface of the shell is bare ; 

 its scidpture agrees with that of the male. Seen from inside: Selvage: This is smooth- 

 edged on the rostrum and has no spine-like process. Along the anterior margin and the anterior 

 half of the ventral margin of the shell it is also smooth-edged. An exceedingly fine serrulation 

 can be observed on the edge of the selvage at about the middle of the ventral margin; this serru- 

 lation increases somewhat, though only rather slightly, in strength along the posterior part 

 of the ventral margin of the shell. Near the right unsymmetrical gland the serrulation is rather 

 course and irregular. Dorsally of this gland the selvage is either irregularly scratched or else 

 it is of the type reproduced in my fig. 4 of C. symmetrica, i. e. undulated and with a small lamelli- 

 forni appendage in every hollow. The compound glands are like those described by G. W. MOller 

 for the male; there are no dorso-medial glands. With regard to the medial glands along the 

 posterior margin of the shell in the male G. W. Muller states that ,,die Mlindimgen .... 

 sind durch flache Bogen verbunden, sie miinden einzeln, abgesehen von einer kleinen Gruppe 

 von drei Zellen, welche in der Nachbarschaft (dorsal von) der rechten unsymmetrischen Driise 

 liegt. Ihre Miindungen liegen auBerhalh, der die Miindungeu der anderen Zellen verbindenden 

 Linie, welche hier etwas ausgeloscht ist." (A group of glandular openings of this sort was found 

 by this writer only on one valve; the corresponding place on the other valve of the only specimen 

 investigated was defective.) The same state of affairs was found by me in the female that 

 I investigated, but with the difference that the group of glandular openings consisted of four, 

 not three, openings and a similar group was found on both valves. There is no distinctly deve- 

 loped hinge-socket or hinge-tooth at the posterior dorsal corner of the shell. 



First antenna (fig. 3): — The joints are rather well differentiated. The first 

 joint is somewhat shorter than the second. The dorsal bristle of tiie second joint has short 



