POLYPS AND CORALS. 189 



of the Sumac of New England (PJius typhina L.) Color 

 bright red, that of the tentacles and spicula deepest ; polyp 

 bodies hyaline, yellowish flesh color." Dr. Wm. Stimpson. 



FAMILY, PRIMNOID.E M. Edwards, emended. 



PRIMNOA COMPRESSA Verrill, nov. sp. 



Corallum much branched in a plane, flabelliform, con- 

 sisting of several large branches arising from near the base, 

 which give off, alternately from each side, numerous, long, 

 slender, acute branchlets, which rise at a very acute angle 

 with the main branches and are often again subdivided in 

 the same way; branches and branchlets strongly com- 

 pressed in the plane of the branches, delicately striated, 

 stony, near the base dark brown, the branchlets yellowish 

 white, their tips setaceous. Height of largest specimen 24 

 inches; diameter of largest branches .25. Ccenenchyma 

 and polyps not observed. 



Aleutian Islands. Capt. Gibson. 



FAMILY, GORGONELLIDJE Valenciennes. 



JUNCELLA L^EVIS Verrill, nov. sp. 



Corallum tall, simple, subcylindrical, rather slender, di- 

 minishing in size both at the summit and near the base, 

 where the polyps become obsolete ; cells appressed, scarce- 

 ly prominent, arranged in two broad bands, leaving a nar- 

 row, median, naked space on each side, along which there 

 is a well marked groove ; they are placed alternately at a 

 distance of about .2 of an inch, in about six vertical rows 

 on each side, producing a quincunx arrangement; axis 

 slender, cylindrical, calcareous, white, surrounded by about 

 sixteen longitudinal tubes, two of which are larger and 

 correspond with the lateral grooves, the others to the rows 

 of polyps. Length of the single specimen, imperfect at 

 each end, 20 inches ; greatest diameter .25. Color yellow- 

 ish brown, in alcohol. 



Hong Kong, China. Dr. Wm. Stimpson. 



ESSEX INST. PROCEED. VOL. IV. Y. 



