45 
5. DESCRIPTION OF SARCOPTILUS, A NEW GENUS OF PENNATULIDA, 
By J. E. Gray, Esa., F.R.S. etc. 
(Radiata, pl. 1.) 
Sir William Jackson Hooker lately sent to the British Museum 
some bottles containing animals in spirits, some from New Zealand, 
others from South America, and some without any habitats : amongst 
the latter there is a fine specimen of a Sea Pen, resembling the true 
genus Pennatula in general form, but differing from it most essentially 
in the form of the pinne and their substance, and presenting a most 
interesting new form in the family. 
Each of the pinne resemble the frond of Renilla, Lam.; they are 
placed in two crowded rows, one on each side of the upper part of 
the axis, and, like that genus, they have the polypes scattered over 
the upper surface of the pinne, which, as well as the surface of the. 
stem, do not exhibit any spicula, but are smooth and fleshy. 
This genus may be considered as the passage between Pennatula 
and Renilla. 
SaRcopPriLvus. 
Coral pen-shaped ; shaft thick, fleshy, attenuated towards the tip, 
smooth, slightly striated longitudinally, and granulose on the surface ; 
axis subquadrangular, rather thick, flexible when moist, formed of 
concentric coats and longitudinal fibres. Pinne placed in two 
crowded rows, one on each side of one of the faces of the upper part 
of the shaft, kidney-shaped, crumpled, with the polypes scattered on 
the edge and upper surfaces, especially near the edge. Polypes 
small, when contracted. leaving very small papille on the surtace. 
SARCOPTILUS GRANDIS. 
Shaft very thick at the base, longitudinally striated. Pinnz 25 
on each side, the lower one smallest. 
Hab. ? Brit. Mus. 
Length 8 inches. 
March 28, 1848. 
William Yarrell, Esq., Vice-President, in the Chair. 
The following papers were communicated to the Meeting :— 
1. DEescrRIPTION OF A NEW SPECIES OF BUTTERFLY, OF THE GENUS 
Acrias. By W. C. Hewirson, M.E.S. Etc. 
(Annulosa, pl. 1.) 
Genus Aerias, Boisd. MSS. 
Head rather broad, clothed with hair; eyes nearly round or slightly 
