252 RITTER 



cular in outline, the upper part domed and oversetting somewhat, par- 

 ticularly in large specimens, the regularly narrowing smaller, or 

 peduncular part. The upper surface somewhat uneven by the projec- 

 tion of the systems which are distinct in life, though coiisiderably ob- 

 scured in the preserved specimens ; six or seven zooids in each system. 



Color. — Light salmon, nearly uniform throughout, zooids more 

 highly colored than test. In preserved condition color uniform ashen 

 with tinge of green ; test somewhat transparent so that the zooids show 

 through rather indistinctly, at the sides, and scarcely at all on the up- 

 per surface. 



Size. — Of largest mass: Height 58 mm., of peduncular portion 31 

 mm., of dome 33 mm., thickness in thickest part 43 mm. (cross sec- 

 tion a circle). Of a medium sized mass: Height 33 mm., of pedun- 

 cular part 20 mm., of dome 10 mm., thickness in thickest part 20 mm. 

 by 24 mm. 



Test. — Cells very numerous and relatively large, but no bladder 

 cells. 



Zooids. — Extremely long and slender, thorax very small in pro- 

 portion to entire zooid ; total length about 25 mm., thickness in 

 thickest place about 2 mm. Of this length (measurements on pre- 

 served specimens, though contractions not great), thorax 4 mm., ab- 

 domen 5 to 7 mm., post-abdomen 21 mm. Not very closely crowded, 

 rather regularly distributed, placed nearly parallel with one another ; 

 few (not more than six or seven) in a system. Not much contracted 

 except as to thorax ; easily removed from test. 



Ma7itle. — Musculature feeble, a few small, irregular, longitudinal 

 bands. 



Branchial apparatus. — Branchial orifices (in life) moderately 

 large, not visibly lobed or with other characteristic marks ; common 

 cloacal orifices distinct, not lobed. Branchial orifices (in preservation) 

 not recognizable, cloacal much obscured. Both siphons rather long 

 and narrow and much alike ; branchial six-lobed, the lobes always 

 broad and low ; atrial also obscurely and irregularly lobed, usually the 

 dorsal side extended more or less to produce an imperfect atrial lan- 

 guet, though frequently showing no intimation of this structure. 



Branchial tentacles around the branchial orifice about seventeen, of 

 several sizes, some very short ; in a close bunch, as seen in dissections. 



Branchial sac very small for the size of the zooids. Series of stig- 

 mata varying from eleven to fifteen, the individual orifices small and 

 regular ; muscle bands in interserial spaces of moderate development. 

 Dorsal languets at least as numerous as the series of stigmata ; rather 

 long. 



