ACTINIARIA 



143 



has such a colour as on Cocks' figure, but which disappear when the column is pale flesh-coloured. I therefore 

 think that there is no difference in the structure of the column of B. tuediae and longicornis. As also the nema- 

 tocysts of the two species show a good conformity it seems to me that we have every reason to conjoin the 

 two species. 



Another view is expressed by Walton (compare Stephenson 1918 b, p. 113), who has seen both 

 species alive and who declares that they are quite "distinct." Also Stephenson (1918 b) believed himself 

 to have found some little difference between the two forms perhaps partly owing to his having compared 

 "Bolocera longicornis" from the Falkland Islands with B. tuediae. He thus pointed out that B. tuediae has 

 a tendency to produce "humps of mesogloea at different points in its course." I have also observed such 

 in a specimen of longicornis from Bohuslan. I cannot find any real differences between the two species, though 

 I have examined the structure of the tentacles and the sphincter and the size of the stinging capsules in 

 specimens from very different localities, also from North- America. 



The following table shows the size of the nematocysts and spirocysts in different parts of the body. 

 The nematocysts in the apex of the tentacles are considerably longer than in the proximal part of the ten- 

 tacles, the smaller specimens have shorter tentacular nematocysts than the larger specimens. 



The anatomy of this species was described by myself (1891, 1893) as to B. longicornis, and by Steph- 

 enson 1918 b as to B. tuediae. I have not placed B. longicornis from the Falkland Islands (Stephenson 

 1918 a, p. 20) in the list of literature, as I am not fully convinced that this species is identical with B. tuediae 

 (longicornis), though it may possibly be so. 



Bolocera multicornis Verr. 

 Bolocera multicornis n. sp. Verrill 1879, p. 198. Andres 1883, p. 453. 



Verr., Me Murrich 1893, p. 155. Haddon 1898, p. 430. Parker 1900, p. 351. 



Carlgren 1902, PI. 3, figs. I, 2, textfig. I, 2. 

 Sagartia (Phellia) abyssicola, Koren and Dan. (p. p.). Danielssen 1890, p. 30, PI. 10, fig. 4. 



Diagnosis: Column low with distal part considerably broader than proximal part. Sphincter diffuse 



