No. 19.] 



ECHINODERMS OF CONNECTICUT. 



143 



The anchors and plates which are found in all parts of the 

 body wall are very similar to those in 5\ inharens, but both 



B 



Tf 



W 



Fig. 29. Synapta roseola.. Calcareous plates. 

 A, portion of calcareous ring; B, anchor and 

 plate from body-wall ; C, plates from tentacles ; 

 D, plates from longitudinal muscles. (After 

 Clark.) 



anchors and plates have a tendency to be more slender (Fig. 29). 

 It is the calcareous ring, however, which furnishes the most pre- 

 cise criterion of distinction, for in this species all the plates 

 are rather narrow, and the radial plates have a notch on the 

 anterior border for the passage of the radial nerve (Fig. 29), 

 instead of the perforation found in S\ inhcerens (Fig. 28). 



Both species occur on the sand flats at Savin Rock, near New 

 Haven, in great abundance. 



Clark, in his extensive Monograph on the Apodous Holo- 

 thurians (Smithsonian Contributions to Knowledge, vol. XXXV, 

 1907), has revised the old genus Synapta and now places our 

 two native species, inhcerens and roseola, in Verrill's genus 

 Leptosynapta. Although his reasons for doing this appear to be 

 perfectly valid, it has been thought best to retain the long familiar 

 generic name in the present work. 



