128 



with a calcareous transverse bar and with a small cryptocyst. Only a short proxi- 

 mal portion of the mandible was preserved. 



The ooecia are low, bowl-shaped, and except in the (piite young are covered 

 by a cryptocyst-belt in the proximal portion. The basal edge of the distal wall, 

 from which the ooecium issues, is placed higher than the top of this, and can 

 therefore by a deep focussing from the frontal surface be seen distally to the 

 ooecium. Such distal walls have the same saddle-shape as the others, and are 

 like these furnished with a row of uniporous rosette-plates. 



The colonies are composed of circular fenestrate lamin.T?, superimposed one 

 upon the other, and growing spirally from a common centre, one from the other. 

 The fenestra; are oval, somewhat pointed and generally much broader than the 

 segment between them. 



The larger part of my material however consists of isolated fragments, and 

 only a single fragment shows three connected laminae. 



The species comes from the China Sea, lat. 26" 30' N. long., 121" 10' E., 

 42 fathoms, and has been taken by Telegra[)h-Engineer Schonau. 



R. cribriformis Busk. 

 Carbasea cribriformis Busk, 

 Challenger Zoology, Vol. X, Part. I, pag. 58, PI. XXXIX, lig. 8. 

 (1^1. I, CiHs. (i:i-61), 1>1. XXII, li^. 2 a). 

 The zooecia have a very variable form, most often elongated hexagonal, oflen 

 rather irregular, wilh a straight distal margin. There is a faintly developed cryp- 

 tocyst in the form of a narrow marginal expansion, the proximal i)art of which 

 is a little more developed. The basal side of the zooecia, which is more calcified 

 than in the foregoing species, has a narrow, median uncalcified, longitudinal 

 belt, which begins at the angle of the distal wall and as a rule reaches almost 

 to the middle of the zotrcium. It is generally narrowest at the middle and widest 

 proximally. On both sides of this we generally find a nundjer of transversely or 

 oblicjuely placed, coarse stri;c, which in difl'erent zooecia may have a very dilTe- 

 rent strength and occupy a very different part of the basal side, and which aiT 

 in reality more calcified and thickened regions of this. In a fragment from Port 

 Darwin this system of stripes is so strongly developed wilh such a pronounced 

 whitish colour, that the whole of the basal side of the colonv' seems even with 

 naked eye to be spotted with white. Besides the longitudinal belt mentioned this 

 fragment by reduced light under the microscope shows a large, pear-shai)ed, 

 dark spot, the proximal border of which meets with that of the longitudinal belt, 

 but is broader than this. It arises from the contrast between a more strongly 



