BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 18. AFD. IV. N:o 1. 73 



with tlie opposite points of attaehment and insertion nearly on 

 a level, and thus almost parallel with tlie ventral surface of 

 the test; tlie protractors vertical but weak, generally not ca- 

 pable of protrnding the teeth far beyond the level of the small 

 stoma, but well adapted to l)ringingtogether and to rub against 

 one another their crowns and thns within the fixed peri- 

 stome to grind the food substauces introduced into the pha- 

 rynx. Thus it seems that further researches will tend to exhi- 

 bit, among the Odontojjliore, the Regularia as predacious and 

 perhaps mainly carnivorous animals, the Irregularia in some 

 sort as omnivorous. 



The position of the aurieles in diflerent types of Ecliinoidea. 



1. Tyipneustes. 2. Clypeaster. 3. Araelinoides. 4. Encope. 5. Echinocyamus. 



6. Cidaris. 



In concluding these remarks I have great pleasure in ex- 

 pressing my obligation to Mr George Liljevall for the assi- 

 duous care he has taken to elucidate them with his trnthful 

 pencil, and for the highly valuable assistance I have received 

 from his keen eye and nice perception, and from his lively 

 interest in my endeavours to throw some liglit on points of 

 Echinoidean morphology hitherto not mnch stndied. 



