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It is broader near the base, very narrow in the upper part. It is not covered by the lateral 

 parts of the rostral latera. 



The rostral 1 a t u s is of an irregular shape, its basal margin being short and going- 

 over imperceptibly into the lateral margin which is convex. The scutal margin is slightly hollowed 

 out, the angle it describes with the lateral margin truncated. 



The infra-median latus is triangular with the rostral margin slightly hollowed out 

 and the carinal margin convex. The umbo is at the apex which is distinctly bent forward. 



The carinal latus has the umbo a little beneath the middle of the carinal margin. 

 The part of that margin above the umbo is strongly hollowed out, that beneath the umbo 

 distinctly convex. The basal margin is short, the lateral margin feebly hollowed out. The upper 

 margin forms a sharp angle with the upper part of the carinal margin. That part of the latter 

 where the umbo is situated can hardly be said to project beyond the line of the carina. 



General remark concerning the form of the valves. The form of the 

 valves as described above only appears after a good deal of the feltlike membrane with the 

 calcareous algae and the muddy particles attached to them has been removed. 



The peduncle is cylindrical. The .scales on the surface are not very numerous, broad 

 and rather prominent. They are placed on five not very regular rows, about five scales forming 

 such a row. 



Size. Length of the whole animal 11,25 mm., of the capitulum 8 mm. 



The specimens of this species were found attached to cylindrical black sticks of four or 

 five centimeters in length, the nature of which I do not know. 



The study of the structure of the female animal contained within the capitulum has 

 eiven the following results. 



Body narrow, elongated, legs relatively stout. 



Mouth with the labrum slightly bullate, edge with a long row of small, pointed teeth. 

 Pali)i triangular, pointed, with a few short hairs on the inner side and a tuft of longer ones 

 at the extremity. 



Mandibles short, with three teeth, each slightly swollen at the extremity. The inferior 

 angle is delicately pectinated and the surface over a great part is covered with very thin hairs, 

 forming groups of three or more. 



Maxillae with a distinct notch beneath the group of upper spines, which con.sists of 

 one very .stout spine, one rather stout and one or two much more delicate. Beneath the notch, in 

 which only some very short hairs are planted, the edge bears about seven spines of unequal size 

 and a few very delicate and much shorter spines. Surface covered with hairs, arranged in groups. 



Second maxillae bulky; outer surface rounded covered by numerous long hairs, 

 forming a tuft at the upper extremity. The opening giving entrance to the body cavity is at 

 the end of a broad and flat tubular process, cut off abruptly at the extremity. 



Cirri. First pair planted close to the mouth, separated from the second by a distinct 

 interspace. Branches of the first pair of unequal length, the shorter is slightly broader and has 

 seven, the longer nine segments. Nearly the whole surface of both rami is covered with numerous 

 and rather long hairs. Cirri of the following pairs relatively short and stout; the rami of 



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