ZOANTHARIA 



21 



frequently occurring nematocysts of the same kind and size as in tlie oisophagus. The species is 

 dioecious. 



The ectodernr of the coenenchyme contains numerous nematocysts of the same shape as in 

 the body-wall, but seems here to be continuous. The mesoglcea contains numerous ectodermal lacunae, 

 in which the large nematocysts, that occur in the body-wall of the polyps, are also found. Tlie 

 entoderm is very large in the canals. 



Epizoanthus lindahli n. .sp. 



PI. 2, figs. 1 1 -13, I'l. 4, fig. 5 

 ZoantJiiis a re fie us Marenzeller 1878, p. 379. 



Occurrence: Baffins Bay 72° 4' N., 59°50'W. 227 fm.s. Hard, gray clay. Ingegerd and Gladan 

 E.xp. 19/7, 1871. Josua Lindahl 3 sp. R. M. (sp. a.) 



79''i3'i"N., 63° 21' 7" W. 230 fm.s. i sp. Musetim at Vienna (sp. b.) 



66°42'N., 26°4o'W. 590 m. Temp, at 550 m. o-ii°. 3/8. 1900 Michael Sars E.xp. St. 13 t colony. 

 Bergens Museum (sp. c.) 



65°oo'N., ii°i6'W. 310 Danish fms. bottom-temp. 001° Ingolf Exp. St. 59 i sp. (sp. d.) 



66°35'N., 56°38' W. 318 Danish fms. bottom-temij. 3-9° Ingolf E-xp. St. 32 i colony (sp. e.) 



var. Nordgnardi Lyngen, Nordgaard i .sp. R. M. (sp. f.) 



Dimensions: (a) Length of the colony about t\ cm., breadth of the largest polyp o-6 cm., of 

 the smallest polyp 03 cm. (b) length of the colony about 1-5 cm., breadth 0-4 cm. (c) breadth of the 

 colony 2-3 cm., lengtli of the largest polyp 1-3 cm., breadth 0-45 cm. 



Colour in alcohol: dirty-gray (c) sand colour with white points of foraminifera and black 

 points of sand-grains, specimen d dark with black sand-grains, f clear, uncoloured. 



External appearance: The coenenchyme is inconsiderable and tube-shaped as in E. erdmanni. 

 The polyps are elongated just in E. erdmanni, narrowest at the base, increasing in size towards the 

 point. They are broadest in the capitular region. The bod\-wall is rough owing to the incrustations, 

 which mainly consist of sand-grains and also of foraminifera (especially in b). The upper contracted 

 border is somewhat rounded — truncate. The capitular furrows are not so distinct owing to the 

 incrustation and contraction, on the largest specimen of the colony I counted 20, on b at least 16, on 

 d 18 probably. 



The oesophagus is short, the siphonoglyphe distinct with a hyposulcus which is as long as tlie 

 oesoijhagus. 



Anatomical description: (i specimen from Baffins Bay and another from c have been 

 closely examined). The ectoderm of the body-wall is continuous and of moderate size, provided with 

 a cuticle, on which detritus particles are fixed. In the lower part of the polyp the ectoderm contains 

 many equally broad nematocysts with greatly twisted thread, having a length of 38— 43/i and a 

 breadth of 10- 12 [x. In the capitular region similar but narrower capsules of the same kind and 

 dimension as in the filaments. The mesogloea is fairly thick, several times thicker than the ectoderm; 

 it is generally rather homogeneous with a frequent occurrence of very small cells and sometimes even 

 cell-islets (PI. 4 fig. 5). The entoderm is extremely thin in the body-wall as well as in the mesenteries and 



