468 



l'A KU ROM AI 



15 mm.), stand at variance with her description in the strongly compres- 

 sed body-form, in the striking diversity of the length of ribs, in the 

 unequalness of the intervals between ribs, and in that the marginal 

 canals send out a number of branches. It thus seems necessary to 

 specifically separate the present form from B. Jiyalina. 



8. Hevo'è forslidlii Milne-Edwards (Pl. VII, figs. 7, 7 a). 



aóro'è forskàlii Chun, iS8d, p. 309, PI. xiv, figs. 3-5. Moser, 1903, Bcstimmungs- 



tabelle. Torrey, 1904, p. 47, PI. i, fig. 2. Moser, 1908, p. 26. Bigelow 



1912, p. 387. 



Boro'è a?isfrrt/is, Agassiz and Mayer, 1898, p. 177, PI, xvi, figs. 49, 50. 



The body is subcortical and very strongly compressed, the width 

 along tentacular axis being 1/3 or somewhat less than 1/3 that along 

 pharyngeal axis, which is 3/5-2/3 as long as the vertical length of 

 body. Subpharyngeal ribs of each pair are disposed very close together, 

 especially in the aboral region where the two almost touch each other ; 

 the greatest distance between them measures somewhat less than half 

 that between subtentacular ribs forming a pair. Superiorly the body is 

 moderately narrowed toward the pointed apex ; the mouth is very wide, 

 its margin looking like two lips of fair thickness. The area of sabre- 

 shaped cilia is precisely similar in outline to that shown in Chun's 

 monograph (1880, PI. xiv a, fig. 8). The cilia are large (1. about 

 45 !>■■> b. about 4.5 ti) and visible to the naked eye. The ribs are all 

 of nearly the same length and are made up of very closely set comb- 

 plates bearing unusually stiff cilia. I have counted as many as about 

 one hundred plates in each rib of an individual of 28.5 mm. long. The 

 meridional canals send out numerous branches on either side ; these 

 make anastomoses profusely between them, and also communicate with 

 pharyngeal canals, bringing about a fine-meshed network of canal- 

 system. The branches of meridional canals are less numerous on the 

 narrower sides of body than on the broader ; and those which occur in 

 the aboral quarter of the former scarcely undergo anastomosis. The 



