134 THE ROYAL SOCIETY OF CANADA 



LICTORELLA CERVICORNIS Nutting 



Fig. 3 



Lictorella cervicornis nutting, Hawaiian Hydroids, 1905, p. 934. 



Trophosome. — Colony with a continuous main stem, reaching a 

 height of nearly 50 mm. in largest specimen; branches given off 

 alternately, at a wide angle with the stem; most of them, in some 

 cases all of them, unbranched; main stem and larger branches fas- 

 cicled. Nutting says the branches are divided into regular inter- 

 nodes, but there is no sign of nodes in these specimens; the processes 

 which support the hydrothecœ, however, are regularly arranged. 

 Hydrothecœ deep, almost tubular; the proximal end narrows into the 

 pedicel and the distal end broadens slightly; just proximal to the 

 margin there is a distinct but short curve in the tube, with the ab- 

 cauline side convex, aperture round, margin entire; pedicel short, 

 making a distinct joint with the process from the stem or branch. 

 Hydrothecae given off from the fascicled portion of the stem, as well 

 as those in the axils of the branches, as a rule, have longer pedicels 

 than those on the monosiphonic branches. There is a nematocyst 

 present in the axil of each pedicel process. 



Gonosome. — "Gonangia forming a coppinia mass on the main 

 stem, the distal ends being the broader on account of the opposite 

 shoulders, which are quite conspicuous and end in round apertures. 

 MidVvay between these shoulders there is a short neck ending in a third 

 aperture. The individual gonangia are borne on short branchlets, 

 which continue beyond them, arching over each gonangium so as to 

 form a protecting network of such branches over the aggregated 

 gonangia. This structure seems to resemble quite closely the phylac- 

 togonia found in certain general of plumularian hydroids." (Nutting). 



Distribution. — North of Gabriola island in 30 fathoms and north 

 of Snake island in 60 fathoms. 



The hydroid fauna of the west coast of North America has little 

 in common with that of the Hawaiian islands. Nutting has pointed 

 out that the relationship is much closer between the Hawaiian forms 

 and those from Australia. Of the 51 species he records, only 8 have 

 been reported from the coast and 7 of these are cosmopolitan forms. 

 The eighth, Pliimidaria corrugata Nutting, is somewhat common in 

 the Vancouver island region and has been found off the California 

 coast. Now this species, Lictorella cervicornis, must be added to the 

 list. When the specimens were obtained it seemed scarcely possible 

 that they should belong to the Hawaiian species but closer examination 

 failed to reveal any reasonable excuse for placing them in another 

 species. 



