[fraser] MON'OBRACHIUM PARASITUM 135 



As L. cervicornis has not been recorded from this coast, a descrip- 

 tion is here included. There was no gonosome present hence Nutting's 

 description is quoted and his figure copied. 



THUIARIA CARICA Levinsen 



Fig. 4 



Thuiaria carica levinsen, Meduser, etc., fra Groenlands Vestkyst, 



1893, p. 213. 

 Thuiaria carica broch, H\clroiden der Arktischen Meere, 1909, p. 176. 



Trophosome. — Colony consisting of a long and rather rigid stem 

 which is but slightly sinuous where the branches are given off; branches 

 regularly alternating, straight and stiff, either not branched again or 

 having but few short branches resembling the main branches; inter- 

 nodes in the main stem and in the branches varying much in length 

 and in the number of hydrothecae given off from each, although the 

 hydrothecœ are placed at quite regular intervals. The number of 

 hydrothecae between two branches in succession also varies although 

 three is the usual number. There is a distinct process on the stem 

 for the support of each branch, and a distinct joint at the place of 

 attachment. Hydrothecae curved strongly outward so that the margin 

 is vertical; the margin is somewhat sinuous; the abcauline side 

 does not extend so far outward as the adcauline side. 



Gonosome. — (From Broch's description) The male gonangia 

 appear on the upper branches of the colony where the stem is turned 

 so that the median plane of the hydrothecae is placed almost horizon- 

 tally. They grow upward from the surface of the branch; the point 

 of attachment is just proximal to the base of the hydrotheca, the 

 gonangia alternating from side to side to correspond to the position 

 of the hydrothecae. The gonangium is obliquely pear-shaped but the 

 margin is at right angles to the axis. 



Distribution. — Som.e fragments were dredged in Bull passage, 

 north of Lasqueti island, in rocky bottom at 25 fathoms. 



This record, new for the coast, is quite interesting on account 

 of the fact that hitherto the species has been found only in the Kara 

 sea region. It is not unusual for a species to be found in the Kara 

 sea and also on the west coast of North America because man}' of the 

 hydroids are circumpolar in their distribution, but the majority of 

 these species have been picked up at intervening points as well. It 

 is not a solitary case, however, and it. may be that the distribution 

 of such species extends from the Kara sea eastward through the 

 Bering strait instead of westward. 



There were no gonangia on the specimens obtained, but Broch 

 has given a figure and a description of these. 



