47° 



TA KU KOMA I : 



9. Beroë mitrata (Moser) (Pl. VII, fig. 8). 



Pandora mit rata, Moser, 1907, p. 451. Moser, 1908, p. 34, Pl. i, figs. 1-3. 



Bigelow, 1912, p. 389. 



Two specimens obtained at Misaki on April 1, 191 8, agree fairly 

 well with MoSER's description and figures of the species from Hokkai- 

 do. The following description is based on the larger (1. 28 mm.) of the 

 two. The body is mitre-shaped and much compressed, the ratio of 

 three axial lengths being 10 : 5 : 2. The aboral pole is moderately 

 pointed ; the polar plates are exposed and provided on the margin with 

 the usual papilliform processes. The interval between paired subpharyn- 

 geal canals is about 2/3 that between the subtentacular. The ribs are 

 all very short ; the subpharyngeals being nearly half, and the subten- 

 taculars about 1/3, as long as the meridional canals. The former 

 consists of abont 50 comb-plates and the latter of about 30. The mouth 

 is large and the pharynx very spacious. The sabre-shaped cilia on the 

 wall of pharynx are of an enormous size, being nearly as long and 

 thick as those found in B. forskàlii. The branches of meridional canals 

 are not very numerous. They are rather simple, showing only a few 

 furcations and run in the main obliquely towards the mouth. No 

 anastomosis occurs among them. Further, there exist branches which, 

 issuing from the deeper parts of meridional canals, are distributed on 

 the surface of pharynx and unite with pharyngeal canals. Such 

 branches occur mainly in the oral parts of body, forming a coarse- 

 meshed network in the pharyngeal wall. The gonads develop from the 

 wall of meridional canals, except for a short stretch at their oral end. 



Colour. — This individual was faintly rosy-coloured along the meri- 

 dional canals. A patch of orange colour occurred on either broad surface 

 of body between subtentacular canals. 



The second smaller specimen (1. 17 mm.) agrees with the above- 

 described in all essential features. 



This ctenophore is very active in movement. One of the specimens 



