MONOCAULTD^. 395 



The stem oi xlmaUhcea Januarii measures six inclies in lieiglit, and one third of an inch in 

 thickness, wiiiie the hydranth is nearly two thirds of an incli in height, and one half of an inch 

 in diameter, having the tentacles of its proximal circlet nearly two inches in length, and about 

 eighty in number. The specimen appears to have been somewhat injured at the distal end of the 

 hydranth, and only a few of the oral tentacles have been here preserved, so that nothing can be 

 asserted as to the number and disi)Osition of these. 



The stem is marked by longitudinal deeper coloured bands, which are mucli more numerous 

 than the corresponding bands of Corjmorpha nutans. It terminates below in a blunt cone, and a 

 little above this it presents a darker coloured zone, marked by longitudinal lines of small dark 

 bodies, which would seem to represent the fleshy processes given off near the base of the stem in 

 Corymoiyha . 



The gonophore peduncles are very numerous. They appear to be about forty, and are 

 branched, and carry the gonophores on the extremities of the branches. The planoblasts are 

 remarkable for the height of the bell in proportion to the width. The margin of the umbrella 

 carries foui" nearly equal bulbs, but no tentacles appear to have been developed from these in 

 the specimen, an indication, doubtless, of an immature state. 



The specific name of this hydroid has been given to it by Steenstrup after the locality iu 

 which it was discovered. 



TROPHOSOME. — Htdeocattlus solitary, naked. Htdranths with a pro:simal 

 aud a distal set of filiform tentacles. 



GONOSOME. — GoNOPiioEES in the form of fixed spokosacs. 



MONOCAULUS, Allman. 



Name.—YmA\ uoloc, solitary, and K-auXo'c, a stalk, in allusion to the single zooid of which the 



trophosome consists. 



TROPHOSOME. — Hydranth abruptly distinct from the hydrocaulus ; proximal 



51 



