HYDROIDA II . 25 



the name of Lictorclla Levinseni, and notes the nematothecie as among its characteristic features; his 

 colonies, which I have had an opportunity of examining-, are fertile, wherefore he was also able to 

 describe the gonosome. This is of a highly peculiar character, aiul at once demonstrates the incorrect- 

 ness of S tec how's supposition (1912 ji. 114) that the species should be identical with Zygophylax 

 aniiata (Ritchie). Ritchie's species (1907 p. 533) has a typical coppinia, tlie tubes of whicli are each 

 furnished with several nematothecae. 



The single gonothecje in Zygophylax biariiiata resemble not a little those of Lictorclla pinnata^ 

 the number of opening tubes, however, being apparentl)' in Zygophylax biarmata constantly reduced 

 to two, the tubes being at the same time somewhat longer. The single gonotheca stands out freely, 

 but the gonothecse are closely packed in clusters on the stem or main branches, and between them 

 we find numerous long nematothecae, remarkably well developed, so that the whole aggregate must 

 be regarded as a primitive coppinia, or rather as something between the open scapus and the coppinia. 



There are one or two points which seem to count against the identity of Lictorclla Levinseni 

 and Zygophylax biarmata. Sa;m und sson's description rather gives the impression tliat there are 

 not, normally, a pair of nematothecae on the apophysis; on closer investigation, however, we are led 

 to the conviction that there are, as a rule, a couple of holes in the periderm showing that nemato- 

 thecae have been there, but have fallen off. The colony investigated is the same which Saemunds- 

 son shows in fig. 2 a. — A further difference would seem to exist in the hydrotheca stalks, which in 

 Saemundsson's specimens are somewhat longer in proportion than stated by Rillard. The length 

 of stalk, however, varies considerably in hydroid species, and cannot thus be used as a specific char- 

 acter. And finally, the hydrothecse in the colony here concerned exhibit a tendency to unilateral 

 arrangement Saemundsson does not mention this feature, nor does Billard make any reference 

 to the same in his exposition. It would nevertheless seem, from Bi Hard's figure (1. c. text fig. 8) 

 that the hydrothecte point obliquely forward towards the one .side, the hydrothecje shown being indic- 

 ated in oblique projection, with the aperture directed slightly forward towards the observer. Here 

 again then, there is nothing which can be taken as evidence of distinction in species. 



The find here recorded extends the known distribution of this deep-sea form considerably 

 towards the north, the species having hitherto been known only from the Bay of Biscay and south 

 of the same. It appears to belong to the abyssal region. 



Family Campanulinidae. 



The In-drothecae are tubular to bell-shaped, sessile or stalked, of the radially-symmetrical type, 

 more rarely with diaphragm. The hydrothecae are furnished with highly organised closing apparatus, 

 falling in the shape of a roof or a pyramid over the indrawn polyp. The colonies are stolonial or 

 sympodial. The polyps have a conically pointed oral part, and gastral endoderm of uniform organisation. 



The generic division of this family has given rise to much dispute, and we even find, that 



certain writers, such as Schneider (1897) and Bonne vie (1899) regard it as a single genus. The 



4 



The Ingolf-Expedition. V. 7. 



