396 Mr. J. Miers on the Calyceracee. 
He plerumque sursum porrectze, interdum reclinate, liquore 
vitali torrentis instar fluente spectabiles. Subtus series duplex 
verrucarum ciliatarum, seu setis tribus instructarum, pedum 
vices agit. 
*‘ Hab. In sedimento rivorum arenoso.” (Verm.Terrestr. &c. i. 22.) 
The figures which illustrate this paper are copied from Mil- 
ler’s ‘ Wiirm.’ plate 5. The only locality in which I have found 
Proto digitata is a small strip of water in Malvern Park, Solihull. 
The worm is about 4 inch long, and } inch broad. 
I remain, Gentlemen, 
Truly yours, 
Solihull, Oct. 16, 1860. Wi.u1am Hoventon. 
L.—On the Calyceracez. 
By Joun Miers, F.R.S., F.L.S. &c. 
[Continued from p. 356. ] 
5. CaLycera, 
The type of this genus, Calycera Cavanillesit, was the earliest 
known species of this family, having been described and figured 
by Cavanilles in 1797, under the name of Calicera herbacea. 
The genus is distinguished by the extreme growth of its calycine 
‘segments, which become expanded into very long spines. In 
this respect it approaches Anomocarpus and Acicarpa. From 
the latter it is distinguishable only by its free achzenia and by the 
much greater length which their spinescent lobes attain; from 
the former it is distinguished by the much greater length of the 
peduncles that support the capitula, and by the different form 
of its seeds. 
The genus Gymnocladus has been proposed by Dr. Philippi 
(Linnea, xxviil. p. 705) upon the slender character of the partial 
abortion of the leaves of the involucre and a globose receptacle, 
in a plant which otherwise possesses the habit and all the floral 
characters. of Calycera. Upon these features we may remark 
that Richard (Mém. Mus. vi. 34), in his description of the typical 
species, Calycera Cavanillesit, shows that the leaflets of the invo- 
lucre are wanting, and figures the receptacle as globose, both 
in that species and in C. balsamitefolia (l. c. pl. 10 4 and 10 8). 
There does not exist, therefore, a single feature in Gymnocladus 
distinct from Calycera. In DeCandolle’s Monograph of the 
family, he enumerates only two species of this genus: four other 
species are here contributed, with the following amended generic 
character :— 
Catycera, Cay., Rich.—Char. reform. : Involucrum polyphyllum ; 
foliola 5-7, uniserialia, imo ad torum accreta, subinzqualia, 
i Batis 
