THE MOUNT DESERT EEGION 283 



CHORD AT A 



UROCHORDA 



Class TUNICATA 



Order ASCIDIACEA 



The general arrangement and nomenclature of genera and 

 families is that adopted by the Marine Biological Association 

 (1931). The specific names agree mth those used by Van 

 Xame (1910, 1912). We wish to thank Doctor Van Name for 

 the determination of the specimen of Synoicum pulmonaria 

 and the forms associated wdth it, and for assistance with the 

 nomenclature. 



Molgulidae (Caesiridae) 

 BosTRicHOBRANCHus Traustedt 

 B. piLULARis (Verrill). (Van Name, 1912, p. 458, pis. 43, 

 44, 69, fig. 137, text fig. 1.) On various bottoms in which 

 there is an admixture of sand. Depth, 30 to 65 feet. Sta- 

 tions : D 29, 31, 75, 81, 84, 137, 141, 142 ; P lOB. 



MoLGULA Forbes (Caesira) 



M. PANNOSA Verrill. (Van Name, 1912, p. 484, pis. 47, 48, 

 fig. 25; pi. 71, fig. 148, text fig. 9.) On piles, just about low 

 water mark, abundant. Hartmeyer (1913, p. 105-106) con- 

 siders this to be M. siphonalis M. Sars. Station : S 14. 



M. ciTRiNA Alder and Hancock. (Van Name, 1912, p. 488, 

 pi. 48, figs. 26-30; pi. 73, fig. 163, text figs. 10, 11.) Common 

 on piles, but dredged rarely to 150 feet. Stations : D 18, 

 33;S14. 



Pyuridae 

 Pyura Molina 



P. ECHiNATA (Linne). (Van Name, 1912, p. 523, pi. 54, figs. 

 61-65; pi. 70, figs. 143, 144, text fig. 23.) Found adherent to 

 stones, on hard bottom, from low water to 90 feet, usually not 

 common. Taken with ripe eggs August 20, 1927. Stations: 

 20, 32, 43, 56, 96, 136-138, 145 ; S 29, 35, 47. 



