20 Dr. J. E. Gray on the Family Pennatuliclrc. 



motile ri1anicnt.s our first (jVmpsc is generally a passing one, 

 caiitrht during; the instantaneous production of a shadow. Ur, 

 although our'objectives may already be considered almost per- 

 fect, that perfection is capable of increase, and we may therefore 

 hope, by a single step in advance, to render the unseen of today 

 the thing seen of tomorrow. 



II. — Revision of the Famihj Pennatulidse, with Descriptions 

 of some neiv Species in the British Museum. By Dr. John 

 Edward Gray, F.R.S., V.P.Z.S., P.E.S. &c. 



[With two Plates.] 



Dr. Herklots, the curator of the Royal Museum at Leyden, 

 has lately published in the last Part of the 'Bijdragen tot de 

 Dicrkunde/ ])art vii. 1858, a monograph of this family, de- 

 scribing and figuring several new species. I shall use his work 

 as the basis of'this communication, as far as regards the species 

 he describes, which I shall attempt to divide into groups for 

 more easy determination. 



Tribe I. Puniculine^, or Janciformes, are elongated Sea- 

 pens with very small pinnules. 



A. The Cells armed with spinulcs. 

 1. PuNicuLiNA, Lamk. 



* Axis quadrangular. 



1. F. quadrangularis, Johnston, Brit. Zooph. t. 31. Scotland. 



** Axis cylindrical. 



2. F. Christii, Sars, Pn. Litt. Norv. ii. t. 12. f. 7-12. Coast of 

 Norway. 



3. F. Finmarchica, Sars, Fn. Litt. Norv. ii. t. 11. Coast of 

 Finmark. 



B. Cells fleshy , not sjiinulose. 



2. ViRouLARiA, Lamk. Axis stony, tapering at each end. 

 Cells not produced. 



* Pinnules well developed, digitate, diverging from the rachis. 



1. V. Vanbenedensis, Herklots, Not. 11. t. 7. f. 7. Hab. . 



2. V. Ellisii. Elongate. Bach is cylindrical. Base elongate, 

 nearly one-third the entire length ; lower part much dilated, 

 club-shaped. The lower pinnules adprcsscd, far apart, nearly 

 transverse as regards the rachis; the upper ones lunate, far 



