720 TAGE SKOGSBERG 



Description: — See U. W. MuLLER, 1906 a, p. 117. 



Su'ppleinerUary descriptiun: ■ — Male: — 



Shell: — Length: According to G. W. MtJLLER 3,7—4,1 mm.; my .siJecimens measured 

 4,0 — 4,25 mm. Length : height about 2,1 : 1; length : breadth about 2,4 : 1. S c e n fro m 

 the side (see fig. 1) it is of about the same type as in C. plinthina G. W. MULLER. It 

 differs from this in the following respects. The anterior {lart of the dorsal margin is partly 



Fig. CW.W'lll. — Ciinrhueriii si/initiririca G. W. MuLLEK, J- — •■ ^ln'" -"^I'l-'ii I'l"" H'l' ^iili': 19 X. ^. Shell situ 

 IViim below; 16 X. 3. Anterior j)nrt of the left valve seen from inside; 39 X. i. A pa'^t of the selvage just inside 

 the lateral rorncr Rland : 8:!3 X. •''i. A pai't of the posterior margin of the shell seen from inside: r)fi7 X. (From 



specimens from slalion (i'l 1).) 



covered by the shoulder vault. The ventral margin is somewhat, though only rather .slightly, 

 concave. The lateral corner glands have their exits on a large conical peg, which is of about 

 the same size and type on both valves and which extends rather considerably beyond the margin 

 of the shell. The processes at the postero-dorsal corner of the shell are somewhat, though only 

 rather slightly, shorter. Seen fro m b e 1 o w it has its greatest breadth at about the middle 

 and the anterior part somewhat larger than the posterior part. The side contours are rather 

 evenly curved except just behind the middle, where they undulate rather weakly. Both the 

 l)ack and front ends are ])ointi'd; the rostral process on the left valve is only slightly larger than 

 that on the right valve; see the appended fig. 2. The shoulder vault is well developed and is 

 rounded. For the sculpture see G. W. Muller. The surf a c e of the shell has a very 



