134 Rev. T. Hincks on Norwegian 



Calycella liroducta^ G. O. Sars (n. sp.). 



The species described under this name will probably prove 

 to belong to the genus LoveneUa (mihi). Its position cannot, 

 of course, be absolutely determined until the history of 

 its reproduction is known ; but it closely resembles the L. 

 clausa (Loven), and is very unlike any known member of the 

 genus CalyceUa. Its polypite too (so far as the figure affords the 

 means of judging) is of a totally different type from that of 

 CalyceUa ; so that if the characters of its gonosome should 

 separate it from LoveneUa, it must still be referred to some 

 other genus. LoveneUa is propagated by means of medusiform 

 planoblasts. 



The present species differs from the British L. clausa 

 principally in the comparative shortness of the conical oper- 

 culum, and the absence of aU annulation or crenation on the 

 stem, except at the very base. 



I^afoema tenuis^ M. Sars. 



This remarkable Hydi'oid was first described by Prof. M. 

 Sars in 1868*; but we have now a fui'ther account of it and 

 an excellent figure from his son. Bearing a curiously close 

 resemblance in its general character to GuspideUa humilis 

 (mihi), it is distinguished from the latter fonn by the extra- 

 ordinary appendages, allied in structure and function to the 

 sarcothecse of the Plumularians, with which it is furnished. 

 These are distributed in great numbers along the creeping stolon, 

 amongst the calycles ; they consist of a filiform offshoot from 

 the ectoderm, somewhat enlarged at the upper extremity and 

 invested by a thin chitinous covering. 



In the capitular portion are lodged a few large thread-cells ; 

 and immediately above it there is a circular orifice in the 

 chitinous envelope, through which the long barbed threads 

 are discharged. These appendages not unfrequently almost 

 equal the calycles in height, and largely exceed them in 

 number. They remind us of the tubular sarcothec^ of the 

 genus Aglaojyhenia, though it does not appear that the sar- 

 costyle has the power of emitting amoeboid processes. They 

 may be regarded as an intermediate form between the Plumu- 

 larian sarcotheca and the tentaculoid organ of Oi)Modes and 

 Oj)ldonema. 



I have lately ascertained that specimens of a Hydroid from 

 Shetland and from the Northumberland coast, which I formerly 

 referred to GuspideUa humilis, really belong to the present 



* " Fortsatte Bidr. til Kundskaben om Dyrelivets Udbreduiiig- i Havets 

 DyLder,'' \\di. Selsk. Forli. f. 1808 (Christi'auia). 



