2 , ACTINIARIA 



mouth thin brown stripes radiate towards the tentacles. Oral labiae and actinopharynx dark chestnut- 

 brown (Danielssen). 



Dimensions in extended state about 25 cm in height and 20 cm in breadth, in contracted 15 resp. 

 23 cm (Danielssen). Preserved specimen from Alten fiord: Height 6 cm. Diameter of the pedal disc 7 cm, 

 that of the oral disc 6 cm. I/ength of the inner tentacles 1,5 1,75 cm, that of the outer 0,5 cm. 



Occurrence: 6iio' N. 632' E. 1229 m. Bottom temp. 6,7 (Norw. N. Atlantic-Exp. St. 2 teste 

 Danielssen). Tanafiord 7O47' N. 283o' E. 232m. Bottom temp. 2,8 (Norw. N. Atlantic-Exp. St. 261). 

 Altenfiord 183 m (Jagerskiold 1890). 



Remarks: I have now examined a specimen of Danielssen's Bunodes abyssorum (from the station 

 261) and I am able to confirm that this species is identical with Actinostola abyssorum, described by myself. 

 The structure of the sphincter, of the tentacles and of the oral disc agrees with that of the same organs of 

 A. abyssorum This is also the case with the stinging capsules. Danielssen's description is not good, there 

 are no acontia, no suckers, the sphincter is mesogloeal etc. For a more detailed description compare my 

 paper (1893). 



A . abyssorum is nearly allied to A . callosa, and it is a question whether this species is really not a variety 

 of A. callosa. I have not seen the specimen from the station 2 and cannot decide, whether it belongs to A. 

 abyssorum or to A. callosa. Concerning Actinostola abyssorum Carlgr. (Pax 1915) compare p. 159. 



Actinostola groenlandica Carlgr. 



PI. 2. Fig. 10. 



Actinostola groenlandica n. sp. Carlgren 1899 p. 33. 



Diagnosis: Pedal disc well-developed. Column cylindrical, in contracted state much higher than 

 broad, from rugose to almost smooth, sometimes with indistinct longitudinal furrows, without tubercles, 

 ordinarily thick. Margin rather distinct, probably not capable of perfect involution. Sphincter rather strong, 

 reticular, sometimes with a little tendency to become alveolar and a little stratified. Tentacles hexamerously 

 arranged, in 6 or 7 cycles, in contracted state rugose, the inner longer than the outer papillar ones, without 

 mesogloeal thickenings at the base of the outside. longitudinal muscles of the tentacles and especially the 

 radial muscles of the oral disc divided into rather fine meshes. Actinopharynx about half or one third as long 

 as the body-wall. Pairs of mesenteries in 5 or 6 cycle, the last (6th) cycle more or less perfect. Mesenteries 

 of the three first orders perfect. Both mesenteries in the pairs of the third cycle about equally developed. 

 Parietobasilar muscles strong, almost reaching the sphincter. Monoecious. Reproductive organs on the me- 

 senteries from the third to the last or to the last cycles but one. The older mesenteries always with ova, the 

 younger with ova and testes, often both testes and ovaries in the same mesentery. Typical nematocysts in 

 the ectoderm of the tentacles 19 27 x 2 2,5 fi and those of the actinopharynx 22 29 X 2 /*. Spirocysts 

 of the tentacles from 22 X 2 /* to about 60 X 4,5 ft. I/arge stinging capsules in the ectoderm of the tentacles 

 38 5 2 X 6 7 fi, nematocysts with discernible basal part to the spiral thread in the actinopharynx 22 29 

 (32) x 45 (6) p. 



Colour? 



