A. E. Verrill on Ascidians from New England. 



while the test becomes very thick and fleshy and covere 

 adhering worm tubes, bryozoa, hydroids, etc., and son 

 contains imbedded Modwtarioe. The tubes are botli 

 upper surface, low, sulcated, well separated, slightly <liv 

 Tbe branchial tube is largest and near one end, a liitlo 

 side of the middle, often curved slightly forward, the si.l. 

 eight strong sulcations, the intervening ridges rouizli aip 

 verrucose in large specimens; aperture with soxiu o 

 lobes; each of the angles with a minute ontu-e-ivJ im 

 Anal tube smaller, low, subcylindrical, >itiiateti larther 

 siJe. and about a third of the length iroui the auteriia- e 

 temally with six ribs and sulcations ; aperiure six-h^be 

 of the'angles with a minute orange eye-six )t. 



Color of the younger specimens pak\ tnnislureni. -nn 

 yellowish gray, or light horn-color, the mantle and «l:trk n 

 distinctly visible through the test; larize s|K-ciniens :nv 

 ^ireenish or olive-color, generally beeoinin,L^ more or le^ 

 brown or russet. Mantle finely speckled with rai>e«l y. 



^^oine of the larger specimens are 4 or o mehes Kmii: 

 broad ; ordinary ones 2 to 3 inches long, by 1 to l-.>l> bn 

 about -50 high; height of tubes '15 to -2') ot an meh ; d 



Eastport, Me., and Grand Menan, at low-wat.T marl- 

 stones, in pools between tides, and at all dr|.tlis to 12<i I 

 on stony bottoms, A^ery abundant — Ex|ieditinns ot 18 

 '63, "eV'eS, 70; Massachusetts Bay,— A. E. Verrill: > 

 ert, Me., common,— A. E. Verrill; Labra^ior.— A. S. P 

 Greenland,— Fabricius, Moller; Grand Banks.— T. M. ( 



The younger specimens of this species ai>pear to c<u- 

 perfectly with A. complanata of Fabricius. 



aona tenella Verrill. Figures 12, 13. 



insufficient); Binney, op. ciL, p. 24, pi. ixiv, fig. ii'l, !»*"• 



Body elongated, attached by the base, soft, flac- 

 cid, varying much in shape in different states of 

 expansion. Tubes subcylindrical, terminal, ap- 

 proximate, a little elongated, the anal smaller and 

 usually divergent, in some states longer, but m 

 other cases shorter than the branchial. Test thm, 

 smooth, transparent; mantle with conspicuous 

 white lon,gitudinal lines and fine transverse ones, . 

 the intestine and branchial sac showing through^ 

 distinctly. At the base the test is often prolonged ^^to short 

 root-like processes for attachment. Branchial onhce with eigftt 

 rounded lobes and eight light orange eye-spots; from the angles 



