194 Prof. Agassiz on the Echinodermata, 



tostoma in the family Sipunculacece ; the first in his address 

 upon the anniversary of Blumenbach (jubile de Blumenbach), 

 the second conjointly with M. Ruppell, in the Atlas appended 

 to the journey into the north of Africa. 



M. Jaeger, in his dissertation upon the Holothurm (Zurich, 

 1833-4), has established three new divisions under the names 

 Miilleria, Bohadschia and Trepang ; but his genus Mulleria 

 is not, as he supposes, identical with the genus Mulleria of 

 Fleming. The second part of this treatise has reference to 

 the anatomical details. In my Prodromus of a monograph 

 upon the Radiata or EcUnodermata, I restricted myself, as it 

 regarded the order Holothuriae, to enumerating that which had 

 been already published, not having made at that time any ob- 

 servations of my own upon these animals. 



The most extensive work which has appeared for a long 

 time upon the Holothurice is that of Brandt ; it forms part of 

 his ^ Prodromus descriptionis animahum ab H. Mertensio ob- 

 servat.^ &c., inserted in the ^ Recueil des Actes de la seance 

 pubhque de I'Acad. des Sc. de St. Petersbourg,^ 1835. Heat 

 first divides this family into two large groups, the Pedata* and 

 the Apodes ; then he subdivides the Pedatae into the Homoi- 

 podes and Heteropodes ; the Homoipodes are in their turn 

 divided into the Dendropneumones and Apneumones ; the Den- 

 dropneumones again into Peripodes and Hypopodes, and the 

 Peripodes into Pentastichce or Sporadipodes ; then the Pen- 

 tastichag are Adeptopneumones with the genera Cladodactyla 

 (and the subgenera Poly dados and Hologoclados, Br.) and Dae- 

 tylota, Br., or Detopneumones, with the genus AspidocJdr, Br. 

 The Sporadipodes only include the genus Sporadipus, Br., 

 with the subgenera Colpochirota and Acolpos, Br. The 

 Hypopodes, which are all PlatygastriccB, include the genera 

 Psolus, Oken (Jaeg.), and Cuvieria, Per., and the Apneumones 

 the single genus Oncinolabes, Br. The Heteropodes he sub- 

 divides into the Stichopodes, Br., with the genera Stichopus 

 (whichincludes the subgenera Pmc?em andGymnochirota,Br,) 

 and DiploperideriSy Br., and Sporadipodes, Br., which are either 

 Aspidochirotce, Br., with the genera Holothuria, Lin. (Br.) 

 (and the subgenera Thelenota, Camarosoma, Platysoma and 

 Microthele, Br.), Bohadschia, Jaeger, Miilleria, Jaeg., Trepang, 

 Jaeg., or Dendrochirotce, with the genus Cladolabes, Br. The 

 second great group, the Apodes, are subdivided into the Pneu- 

 monophorce, With, the genera Liosoma,BY,, and Chirodota,'Et9ch.., 

 and into Apneumones, with the genus Synapta, Esch. .This 

 systematic arrangement is accompanied by the description of 

 a great number of species, principally discovered by Mertens. 



Brandt afterwards describes three new species of Sipuncu' 



