596 TAGE SKOGSBERG 



of this species investigated by me, 28 individuals from five localities, had shells from 1,6 to 

 1,8 mm. long. The proportion between the length and the height varies somewhat; it is about 

 1,1 — -1,25:1; length : breadth about 1,25:1. Seen from the side the sjiecimens 

 investigated by me were of about the t}'pc reproduced in pi. VII, fig. 19. G. W. MUller, 1906 a, or 

 else they were not quite so ventricose at the back; see the accompanying fig. 3, Seen from 

 beneath the shell is of the same type as that of the male, but, as is seen from the figures 

 given above, not inconsiderably wider; its greatest breadth is at about the middle {fig. 4). Seen 

 from behind (fig. 5) it is also of about the same type as that of the male, apart, of course, 

 from the fact that it is wider. In other respects it resembles that of the male. 



Second antenna: — The protopodite (fig. 9) is rather slightly smaller 

 than in the male; in females with shells 1,6 — 1,7 mm. long this part was about 0,6 mm. in length. 

 (By way of comparison it may be mentioned that in females of Conchoecia elegans of about 

 1,6 mm. in length the protopodite attained a length of about 0,7 mm.) E n d o p o d i t e: This 

 has three joints; the small end joint is always distinctly marked off proximally; see the accom- 

 panying fig. 12. The a-, b-, f-, g-, h-, i- and j-bristles are quite or almost quite similar to those 

 of the male. A peg-like process of the end joint is fixed between the h- and i-bristles. On the 

 other hand this joint is without the proximal peg-like process that is foimd on this 

 joint in the male. 



Mandible (fig, 16): — This differs from that of the male in the following respects: 

 Endopodite: The first joint has only two bristles ventraUy, which, to judge from their 

 position, are homologous with the lateral and the distal of the medial ones in the male; in most 

 cases they are somewhat shorter, relatively, in the female than in the male. Second joint: Of 

 the two postero-distal bristles one is about as long as in the male, the other is about a third 

 shorter. End joint: The third bristle, counting from in front, is decidedly more powerful than 

 the others and is usually about as long as the endopodite. The two bristles in front of and the 

 nearest bristle behind this bristle are in most cases subequal and about a third shorter than the 

 latter. Of the three others, the posterior ones, the two medial ones are about as long and as 

 strong as in the male, the third is most frequently somewhat longer than the two anterior bristles 

 on this joint, but not quite so long as the long bristle situated in the middle. The pilosity is 

 considerably less developed than in the male; the second protopodite joint is almost quite smooth; 

 there never seem to be any hairs distally on the inside of this joint. In other respects this limb 

 agrees with that of the male. 



Sixth limb: — This is of the same type as in the male, but some bristles, especially 

 the dorso-distal and ventero-distal ones on the first exopodite joint, are somewhat longer (see 

 the accompanying fig. 24). 



The r o d - s h a p e d organ is of the same type as in the male. 



Synonymy Remarks: — As is shown above, I have accepted — on the whole without alteration — 



the list of synonyms worked out by G. W. MULLER for the species described above. My reason 

 for doing this was that, hke this writer, I was convinced that all the forms of this genus whose 

 shells are characterized by rostra of the type reproduced above, belong to one and the same species. 



