370 Miscellanies. 



plan of his work he says : " My intention is to figure and describe all 

 the new and less common species, as well as those hitherto incorrectly 

 figured. But not being able consistently with the interests of the work 

 to confine myself to a regular mode of publication, and to that end to 

 publish on a given day, before the rest, those parts of my researches in 

 which I have united the new materials and the most perfect notes, I 

 will publish in succession, raonographies, each embracing a natural group 

 and forming continuous wholes, whose order of sequence will be of little 

 consequence, since they will, in the conclusion, fall into their proper 

 places, with those general considerations which will terminate this work. 

 These monographies whose extent will be proportioned to their contents, 

 will appear at irregular intervals. This is I believe the only course 

 which an author can follow, who publishes his labors in Livraisons, with- 

 out continually incurring the reproach of delay and remissness, often so 

 little merited. Thus conducted, this work may in some sort, be regarded 

 during the course of its publication, as a journal or record devoted to the 

 investigation of the whole class of Echinodermata ; and I shall be happy 

 to record there any new facts which may be transmitted to me. 



" The new species, which have been omitted in the chapter devoted to 

 their genera, will be described in the supplements which will accompany 

 the monographies, as often as there is occasion for them. I have (that 

 my correctness may be tested) caused plaster casts to be made of all my 

 new genera and species when the specimens would permit, which I now 

 offer to museums and individuals in hopes of obtaining by exchange new 

 materials for my work." 



The present Livraison is devoted to the consideration of the Salenies 

 the number of whose species he has quadrupled and divided in the fol- 

 lowing manner. 



1. Those having the anal aperture in front, comprising T. personate, 

 Ag. the Cidaris personata of Defrance. II. scripta, Ag. The only ex- 

 ample of this species which I have seen, forms part of the Paris Museum, 

 and was communicated to me by M. Valenciennes ; its origin is un- 

 known. III. petalifera, Ag. Echinus petaliferus, Des M. IV. geomet- 

 rica, Ag. V. scutigera. Gray. Cidarites scutiger. Mtinst. VI. gibba, 

 Ag. VII. S. trigonata, Ag. 



2. Those having the anal aperture placed posteriorly. VIII. S. stellu- 

 lata, Ag. IX, S. areolata, Ag. Chapter II treats of the new genus 

 Goniopygus, Ag. containing the following species : I. G. peltalus, Ag. 

 II. G. intricatus. III. G. Menardi, Ag. Echinus Menardi, Desm. IV. 

 G. heteropygus, Ag. V. G. globosus, Ag. \"I. G. major, Ag. Chap- 

 ter III contains the genus Peltastes, Ag. in two species, viz. I. P. pul- 

 chellus, Ag. IT. P. marginalis. Chapter IV is devoted to the genus 

 Goniophorus, of which he has described I. G. lunulatus, Ag. and G. ap- 

 iculatus, Ag. 



