134 CLARK. 



6. Synapta acanthia, nov. sp. Plate IV. 



Medium-sized synaptid, five or six inches long, white with a 

 strong rosy tinge. Tentacles 12, each with 15—19 digits and 

 25 or more sensory cups on inner surface. No trace of eye 

 5pots. Anchors of two kinds, those of the rear of the animal 

 long and prominent, giving a very spiny appearance and feeling 

 to a contracted individual. Found in the sand in sheltered 

 coves and probably not rare. 



7. Synapta inhaerens (O. F. Mull.). 



Medium-sized synaptid, generally pure white, rarely rosy. 

 Tentacles 12, with 7—1 1 digits each and about a dozen sensory 

 cups on the inner surface. No trace of eye spots. Radial 

 pieces of calcareous ring perforated for the passage of the nerve. 

 Found in sand with the preceding but rather uncommon appar- 

 ently. 



8. Synapta roseola (Verr.). 



Small synaptid, one to four inches long, bright rosy in color. 

 Tentacles 12, each with 5-9 digits and 7-15 sensory'cups. No 

 eye spots. Radial pieces of calcareous ring simply notched, 

 not perforated, for passage of the iierve. Found with the pre- 

 ceding but seems to be more common. 



9. Synapta vivipara (Oerst.). 



Small synaptid, reddish- or greenish-brown, generally more or 

 less flecked with white. Tentacles 12 (11-13) each with 25-37 

 digits. No sensory cups but eye spots at base of tentacles. 

 Body cavity usually contains young. Found in seaweed and 

 under rocks, never buried in the sand. Apparently not common 

 though recorded several times from Bermuda. 



10. Chiridota rotifera (Pourt.). 



Small synaptid, one-half an inch to two inches long, white, 

 yellowish or flesh-color. Tentacles twelve, each with 5-9 

 digits not arranged so pinnately as in Synapta. No anchors in 

 the body- wall but wheels with six spokes. Body cavity some- 

 times, contains young. Found under rocks in the sand, and in 

 company with nos. 6, 7 and 8. 



