CIvRIANTHARIA. jg 



Diagnosis. Medium-sized species with 30—40 marginal tentacles and about the same number 

 of labial tentacles. iVIarginal tentacles very long, arranged in at least 2, probably more cycles, set very 

 close together. Labial tentacles half the length of the marginal tentacles; their arrangement is: 4(dt) 

 o, 2, 3 4, 1, 3, 2 4, 3, I, 2 ; 4, 3, I, 2 I The distal portion of the column with well marked furrows corre- 

 sponding to the mesenterial attachments. Siphonoglyph narrow, luposulcus distinct but small, hemi- 

 sulci very long but narrow. Protomesenteries 2 very long, reaching right to the aboral pole, fertile, 

 with well developed ciliated tract region, which is rather longer than protomesenteries 3, short cnido- 

 glandular tract region and long craspedion region. Protomesenteries 3 about '/^ of the length of the 

 body, reckoning from the aboral end of the stomatodaeum to the aboral pole. The metamesenteries 

 developed as in Cerianthus lloydii with similar arrangement of the parts of the filaments. Ciliated 

 tract region straight, without craspedonemes. 



Occurrence. 64° 2' N. 5° 35' E. 911m. Clay. Temperature at bottom — 1,1° NNAE., St. 87, 22.8. 



1876 ( C. vogti). 

 68° 6' N. 9° 44' E. 1159 m. » » » — 1,3° NNAE., St. 251, 9. 8. 



1877 [C. abyssoruni). 



Dimensions. C. vogti: Length of bod\- So nun., breadth in distal portion 20 mm., in proximal 

 portion 6 mm., according to Daniels sen: the corresponding dimensions ior C.abyssoniin are given by 

 Danielssen as 65, 25 and 8mm. 



Coloiir. According to Danielssen "The body is pale yellow with a pale rose-red play of 

 colour [C. vogti); pale brownish but its uppermost margin is for a few millimetres of its breadth, white 

 [C. abyssoruni). The marginal tentacles are upon their aboral side a beautiful rose-red, and on the 

 adoral side light-brown; the oral tentacles are a beautiful chestnut brown colour, also the oral disc, 

 but with lighter coloured radii {C. vogti); the oral disc is dark brown with a lighter coloured annulus 

 round the oral aperture ( C. abyssoruni). -=. 



Tlu: outward appearance is rather well described by Danielssen. The species has the charac- 

 teristic form of Ceriantharia, but is rather broader in the distal than in the proximal region. According 

 to Danielssen, an aboral pore is found. The most distal portion of the body has very deep furrows 

 corresponding with the mesenterial attachments. The marginal tentacles are very long in comparison 

 with the size of the animal. They are arranged in at least two cycles, probably more, but as the 

 tentacle cycles are very closely set and the specimen is not very well preserved it is almost impossible 

 to determine the number of cycles. The labial tentacles are about half the length and breadth of 

 the marginal tentacles. A directive labial tentacle is certainlv found, situated very high up and 

 ought to belong to the 4th c)-cle or perhaps to the 3rd. On the other hand, the two chambers 

 contiguous to the directive chamber on either side appear, as far as I can see, to be without labial 

 tentacles. That this is really so, finds support in the fact that on such an hypothesis the remaining 

 labial tentacles fall into a typical arrangement, which would not be the case, if we suppose, beside 

 the existing tentacles, others proceeding from these two chambers as well. According to my obser- 

 vations, the labial tentacles would be arranged in the following manner 



4, (dt) o, 2, 3 1 4, 1, 3, 2 i 4, 3, 1, 2 i 4, 3, 1, 2 j etc. 



In C.abyssonim I have not been able to observe the grouping of the tentacles in the vicinit)- 



