. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 55 Occurrence: Norway Finmark (Goes andMalmgren) 5 sp. Tromso 20 fras. (GoesandMalmgren 3 sp. littoral (Kier) 3 sp. Exterior aspect: The physa is ampullaceous in extended state and perforated by apertures, the number of which I have not been able to determine with certainty. In a specimen I observed such apertures in 7 compartments. Probably tliey are arranged in a ring round a central aperture. The specimen from Finmark, mentioned by myself as (1893, p. 16), belongs t
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 55 Occurrence: Norway Finmark (Goes andMalmgren) 5 sp. Tromso 20 fras. (GoesandMalmgren 3 sp. littoral (Kier) 3 sp. Exterior aspect: The physa is ampullaceous in extended state and perforated by apertures, the number of which I have not been able to determine with certainty. In a specimen I observed such apertures in 7 compartments. Probably tliey are arranged in a ring round a central aperture. The specimen from Finmark, mentioned by myself as (1893, p. 16), belongs to The scapus is provided with a thin periderm in which there are ochreous-coloured incrustations. The nemathybomes are very small, but numerous and scattered. The sca- pus seems to be smooth, because the nemathybomes o:iIy rise a little or not at all over the sur- face, in contracted as well as in expanded individuals. The proxi- mal part of the scapus is almost round, the distal part polygonal, probably on account of the con- traction. The capitulum is short. The number of the tentacles va- ries considerably. Of 5 examined specimens one had 16, two 22, one 23 and one 26 tentacles, ar- ranged in two or three cycles. The oral disc is small, the actinopha- r\'nx short. A ventral siphonogly- phe is present. Anatomical descrip- tion: The nematocysts of tlie physa are 12—14 11 in length. The apertures are surrounded by cir- cular muscles. The numerous ne- matocysts of the nemathybomes vary considerably in size, they are commonly 31—44 a long, sometimes shorter, down to 26 /i, sometimes longer, unto 62 //. The ectoderm of the capitulum is rather thick, with sparse nematocysts, 10—12 n long. The high ectoderm of the tentacles contains numerous nematocysts (22— ^3 n) and spirocysts (14—17 fi long). The ectodermal longitudinal muscles of the tentacles are rather well- developed. The ectoderm of the actinopharynx is high and provided with several ridges; its nem
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
