631 



15, lieber Leskia itiirabilis Gray. 



Von Herrn 'S. Loven in Stockholm. 



Aus der „ Ofversigt af Kongl. Vetenskaps - Akademiens Förhandlingar. 

 Stockholm 1867. No. 5" übersetzt von Herrn A. Kcnth in Berlin. 



J. E. Gray beschrieb 1851 dieses neue Geschlecht mit 

 folgenden Worten*): 



„Shell ovate, subglobose, thin, vertex central; lateral am- 

 bulacra broad, petaloid, rather sunken and separate from each 

 other, the hinder lateral pair rather the shortest, the odd an- 

 terior ambulacra in a rather broad sunken groove, rudimentary, 

 with only a single* series of pores on each side ; all surroun- 

 ded by a broad, rather sinuous peripetalous fasciole; lateral 

 and subanal fasciole nooe; mouth anterior, round, on a level 

 with the rounded under surface, and covered with five trian- 

 gulär converging valves ; plastron and subanal plate not di- 

 stinctly defined; anus round, in the upper part of the rounded 

 posterior end , and covered with five triangulär converging 

 valves forming a cone , with some small spicula in the xientre; 

 ovarian pores two, very large; spines and tubercles subequal, 

 subulate, those of the back being rather the largest. 



This genus agrees with Brissus in the form of the peri- 

 petalous fasciole, but differs from it and all the other Spatan- 

 gidae in the form of the mouth and vent. 



1. Leskia mirabilis. Shell ovate subglobose. 



Hab. Isle of Luzon. 44 



Etwas später setzte er hinzu**): 



„In the form of the mouth and vent it has considerable 

 affinity with the fossil Cystidea of von Buch, as especially 

 the genus Echinosphaerites. u 



*) Annais of Natural History, second series, VII, p. 134. 

 **) Catalogue of the recent Echinidae or sea eggs in the collection of 

 the british Museum, 1855, p. t>3, t. 4, f. 4. 



41* 



