﻿146 Proceedings of the Pioijal Physical Society. 



Our specimen resembles T. regalis (1) in having bright 

 red longitudinal lines on the coenosarc, which are seen 

 shining through the clear perisarc ; (2) in the breadth of 

 the hydrocaulus (3 mm.) ; (3) in the great height and breadth 

 of the hydranth ; (4) in the length of the proximal tentacles 

 (up to 22 mm.) ; (5) in the length of the distal tentacles 

 (3-4 mm.) ; (6) in the shape and arrangement and length 

 of the blastostyles ; (7) in the long spadix within the 

 gonophores ; and (8) in showing no trace of radial 

 canals. 



Our specimen differs from T. regalis, as described by 

 Boeck, (1) in having 32-36 proximal tentacles instead of 28, 

 but Bonnevie says 20-30 ; (2) in having shorter proximal 

 tentacles and blastosyles, 12-22 mm. instead of 42-45 mm., 

 but Bonnevie gives 20-40 mm. as the length of the tentacles 

 and 35 mm. as the length of the blastostyles. It should 

 also be noted that our specimen was considerably contracted 

 by preservation before the measurements were taken. 

 Boeck figured the blastostyles as if they stood up 

 vertically, but Allman pointed out that this position is 

 impossible. 



Before giving a tabular comparison, which will show the 

 resemblances and differences at a glance, we may supplement 

 the descriptions of T. regalis by a reference to the hydro- 

 rhiza, which was absent in the specimens obtained by the 

 Norwegian North Atlantic Expedition, and was left un- 

 noticed by Boeck. As Miss Bonnevie supposed, the lower 

 part of the hydrocaulus is composite, as in T. indivisa. The 

 stems are twisted together in a tangle at the base. It may 

 also be noted that one hydrocaulus bears a small barnacle, 

 Scalpelhcm vulgar e. 



