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 HolothuruB (Zurich, 

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

 Mulleria, Bohadschia and Trepang ; but his genus Mullen a 

 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 Echinodermata, I restricted myself, as it 

 regarded the order Holothuria, 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 e Prodromus descriptionis animalium ab H. Mertensio ob- 

 servat. 5 &c, inserted in the e Recueil des Actes de la seance 

 publique de l'Acad. des Sc. de St. Petersbourg, 5 1835. Heat 

 first divides this family into two large groups, the Pedatce 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 Pentasticha? or Sporadipodes ; then the Pen- 

 tastichae are Adept opneumones with the genera Cladodactyla 

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

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

 The Sporadipodes only include the genus Sporadipus, Br., 

 with the subgenera Colpochirota and Acolpos, Br. The 

 Hypopodes, which are all Platygastricce, include the genera 

 Psoitis, 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 

 (which includes the subgenera Perideris andGymnochirota,Br.) 

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

 Aspidochir otce, Br., with the genera Holothuria, Lin. (Br.) 

 (and the subgenera Thelenota, Camarosoma, Platysoma and 

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

 Jaeg., or Dendrochirota?, with the genus Cladolabes, Br. The 

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

 monophora>,Mvith the genera Liosoma,Br., and Chirodota,J&sch., 

 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- 



