ASOIDIA KUBROT1NCTA. 87 



vessels are pretty regular, having the stomata recti- 

 linear, the ends being a little rounded. The papilla? 

 are large, long, and conical, and are situated on the 

 longitudinal bars at the intersections of the meshes, 

 and also on the bars between the intersections ; they 

 are of nearly equal size, the intermediate ones being 

 scarcely shorter than the others ; the papillary mem- 

 brane is strongly developed. The longitudinal bars 

 are delicate, with a membranous expansion along the 

 inner margin. The oral lamina (PI. XIX, fig. 2) is not 

 very wide, but maintains its width for some distance 

 behind the mouth ; it never becomes very narrow, but 

 ends rather abruptly at the bottom of the branchial 

 sac ; it is strongly ribbed transversely on the right 

 side, and the margin is pectinated throughout; the 

 tentacular points in front, and also at the left side of 

 the mouth, where they number twenty-one, are narrow 

 and united at the base by a membrane ; those in con- 

 tinuation of the series below the mouth have only their 

 points free, and of these there are between thirty and 

 forty. The tentacular filaments at the entrance of the 

 branchial sac are delicate and numerous, situated not 

 much in advance of the branchial margin ; they are 

 very unequal in size, some being excessively short, 

 others of considerable length. The branchial tubercle 

 is quite minute, and forms a simple loop with the left 

 extremity turned inwards. 



e/ 



The ovary is seen at both sides of the intestinal 

 loop ; on the left it has a lobulated appearance, on the 

 rio'ht it assumes a branched, tubular form as it becomes 



o 



united to the extremity of the wide oviduct. The 

 short, wide, caecal extremities of the male organ are 

 observed on the right side by the margin of the 

 ovary. 



A. rubrotincta is a near ally to A. 'iiienfula, from 

 which, however, it is distinguished not only by its 

 colour, but also by several points of detail. The test 

 is thinner and less coarse than it is in the latter species, 

 and the tubes are better marked, particularly the 



