SPATANGUS RASCHI. 5G7 



Seen in profile, the test rises rather more suddenly in the anterior part 

 arching uniformly towards the truncated anal extremity. The actinal sur- 

 face is nearly flat, sloping towards the edge ; the actinal plastron alone 

 sloping towards the ambulacra from the median line, forming an indistinct 

 keel. The plates of the ambulacra on the actinal surface are elongate ; the 

 pores far apart, except immediately round the actinostome, to form the very 

 marked phyllodes. The changes due to growth have been described by 

 Loven, and have been referred to in the description of the Florida Echini, 

 Kev. Ech., Pt. II. p. 331. 



Norway ; Mediterranean. 



Spatangus Raschi 



! Spatangus Raschi Lovtfx, 1869, Ofv. Skand. Vet. Akad. Furh. 



PL XXV. f. 35 ; PL XXVI. f. 23. 



This fine Spatangoid has been well figured by Loven. It is easily distin- 

 guished from its European congener by the more angular outline of the test, 

 seen from above, the great height of the test, the depth of the anterior fur- 

 row at the ambitus, and the narrow elongate pointed lateral petals. The 

 primary tubercles of the abactinal part of the test have the same general 

 arrangement as in S. purpureus ; but they are smaller, more numerous in 

 each patch, and extend to the edge of the test in all the interambulacral 

 spaces. In the ambulacra! plates, between the extremity of the petals and 

 the edge of the test, smaller primary tubercles are crowded in the lower 

 half of the ambulacral plates. Seen from the actinal side the test slopes from 

 the edge towards the sunken actinostome, especially in the anterior part of 

 the actinal surface of the test, where the slope is quite sharp. The actinal 

 plastron is elongate, narrow, widest half-way to the posterior edge ; the test 

 sloping from the broad bare posterior ambulacral avenues to the indistinct 

 keel, which extends from the very prominent posterior lip of the actino- 

 stome. The subanal plastron is heart-shaped, edged by a narrow fnrc'ole. 



