136 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



Fig. 26. Thyone unisemita. Outlines of calcareous plates. A, from 

 body-wall; B, madreporic plate; C, from pedicels; D, from tentacles. 

 (After Clark.) 



numerous perforations. The madreporic plate and the charac- 

 teristic plates of the pedicels and tentacles are shown in Fig. 26. 

 Further details of the anatomy may be found in Clark's 

 Report on the Echinoderms of the Woods Hole Region. 



Thyone scabra Verrill 



Rough-skinned Thyone 



Plate XXXII, fig. 7. 



This species has not as yet been recorded from Connecticut 

 waters. It is, however, included in this report because it has 

 been collected near the eastern entrance to Long Island Sound, 

 and is reported from Narragansett Bay. Hence its occurrence 



Explanation of Plate XXXII. 



Fig. 1. Thyone unisemita. Three specimens preserved in alcohol, with 

 completely retracted peristome and tentacles. Slightly en- 

 larged. 



Figs. 2-6. Cucumaria pulcherrima. Five specimens after preservation in 

 formalin, showing variations in shape of body and ambulacral 

 areas. Slightly enlarged. 



Fig. 7. Thyone scabra. Preserved specimen with extended peristome, 

 and partially extended tentacles. Slightly enlarged. 



Fig. 8. Synapta inhcerens. Anterior portions of body of two individuals 

 with partially contracted tentacles. Natural size. 



Fig. 9. Synapta inhcsrens. Posterior portion of body, showing two of 

 the five longitudinal muscular bands. Twice natural size. 



