io6 



narrow and is bordered by ridges wliich are not prominent. The sides are also narrow, only 

 slightly increasing in width from below upwards. 



The upper latus is large with the apex produced, entering into the narrow angle 

 between the lateral margin of the scutum and the scutal margin of the tergum. The shape of 

 the valve is triangular, one of the angles is, however, truncated by the short carinal margin, 

 and another, the basal, by the very short basal margin between this valve and the rostral 

 latus. The umbo is at a little distance from the ape.x, close to the scutal margin. 



The rostral latus is quadrilateral and rather high. The angle formed by the scutal 

 and lateral margins is truncated and the valve at that angle is in contact with the upper latus. 



The infra- median latus is narrow and elongate with the umbo at the superior 

 extremity. The latter touches the upper latus. 



The carinal latus is quadrilateral. The carinal margin is the longest; it is nearly 

 straight, only very feebly hollowed out in the upjjer part for the reception of the lower extremity 

 of the carina. The umbo is at a short distance from the base. The lateral margin is straight, 

 the upper margin slightly convex. 



The peduncle is nearly cylindrical, compressed laterally. The scales are thin and 

 broad and rather prominent. They are placed in five longitudinal rows, each row having 

 about fifteen. 



Size. The whole length of the largest specimen was 13,6 mm., that of its capitulum 

 10 mm. The size of the other specimens was but slightly different. 



The study of the animal contained within the capitulum has yielded the following results : 



Mouth. The labrum has the front part somewhat bullate, forming a rounded slightly 

 overhanging projection; crest with very minute teeth; palpi short and broad, rounded at the 

 extremity, where about half a dozen hairs are planted. 



Mandibles with three teeth and the inferior angle pectinated ; the distance between 

 the tips of the first and second tooth equals that between the tips of the second and third and 

 of the third to the inferior anorle. 



Ma.xillae with the edge perfectly straight; about the middle the edge has an interspace 

 without spines, four spines (two large, one smaller and one very small) being inserted above the 

 interspace and about six rather short spines, only one of which is longer than the others, below. 



Outer maxillae rounded, bristles in two separate groups. Openings giving entrance 

 to the body cavity at the end of long, flat processus, cut off transversely at the extremity. 



Cirri. First pair attached near the base of the mouth and at a little distance from 

 the second pair; rami very unequal, the shortest having 7 to 8 very broad segments, soldered 

 tightly together, so that the limits can only be distinguished with difficulty; the longer ramus 

 has 9 much narrower segments, the first of which is very long. The shape of the shorter ramus 

 as a whole is leaf-like, that of the longer cylindrical. Both rami are covered with numerous 

 and long spine-like hairs. 



Second pair elongate, also with unequal rami: the shorter has 12, the longer ramus 

 16 segments. In both rami the first segment is very long, the 3 or 4 following are nearly 

 quadrilateral, the fifth growing longer and slightly narrower, until the last are very elongate 



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