VAN NAME: SIMPLE ASCIDIANS. 521 
1870. Molgula producta Binney, Gould's Invertebrata of Massachusetts, 
ed. 2, p. 21 (not pi. 22, figs. 315, 316). 
1870. Molgula producta Dall, Proc. Boston Soc. Nat. Hist., vol. 13, p. 255. 
1872. Molgula producta Verrill, Amer. Journ. Sci., ser. 3, vol. 3, pp. 211, 288, 
pi. 8, fig. 6. 
1873. Molgula producta Verrill and Smith, Rept. on Invertebrate Animals of 
Vineyard Sound, pp. 502, 510, 699. 
1879. Molgula producta Verrill, Preliminary Check-list of Marine Inverte- 
brates, p. 27. 
1891. Molgula producta Herdman, Journ. Linn. Soc. London, Zool., vol. 23, 
p. 569 (listed as uncertain species). 
1909. Caesira producta Hartmeyer, Bronn's Tier-reich, vol. 3, suppl., p. 
1324 (listed as uncertain species). 
1912. Caesira producta Hartmeyer, Sitzungsb. Ges. Naturforsch. Freunde, 
1912, no. 1, p. 19. 
Probably not Molgula producta Whiteaves (1874, 1901) as some of Whit- 
eaves' specimens from the GuK of Saint Lawrence labeled "Molgula producta" 
(identified as such by Professor Verrill) are Bostrichobranchus pilularis. 
Stimpson's (1852) description of Molgula jyroducta is as follows: 
" This is usually perfectly globular, while the apertures are on tubes 
often equal in length to the diameter of the body, which originate 
close together and diverge. The test is rather thin, pellucid, usually 
of a pale rose tint, and covered, the tubes included, with a thin coating 
of sand. The branchial aperture is rounded, with six short cirri 
within, the anal is square. Diameter half an inch. 
"It occurred on a sandy bottom, in six fathoms in Boston Bay; 
and also at low water on Bird Island. The tadpole-like young were 
ejected in August, and were of a bright vermilion color, which con- 
tinued for a long time after their final detachment." 
Localities, Boston Bay, sandy bottom, 6 fathoms, and at low water 
on Bird Island also near Boston. 
Verrill and Smith (1873) give the following: 
(p. 502) " The Molgula producta was dredged in some numbers on a 
bottom of fine sand, with some mud. The integument is thin, trans- 
lucent, closely covered with a layer of fine sand; the tubes are trans- 
parent, whitish or flesh-color, sometimes pink at the ends; anal tube 
with four, and branchial with six, flake-white, longitudinal stripes 
and often with a circle of flake-white spots at the base outside, and 
other spots within. The anal orifice is square, but the branchial is 
either subcircular or squarish, in expansion, and destitute of distinct 
lobes or papillae, in this respect differing from all the other species of 
