BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 157 
Verrill and Smith (1873) listed 18 determined species of tunicates for local waters, 
together with two which were not definitely recorded for the region, and five others 
which were not specifically determined. A number of these ascidians had been recently 
described by Verrill himself from specimens taken in the vicinity of Woods Hole. The 
Leptoclinum luteolum of Verrill is not regarded by Dr. Van Name as specifically dis- 
tinct from the L. albidwm of the same author, which, contrary to the belief of Verrill, 
does not appear to occur within the limits of our region. The ‘“‘Ciona tenella” of 
Stimpson and of Verrill is now regarded as identical with C. intestinalis (Linneus), 
while the ‘‘Salpa cabott’”’ of Desor, which appears in Verrill’s list, is not believed to be 
distinct from the Salpa democraiica-mucronata of Forskal.% 
Certain species listed by Verrill (Molgula papillosa, M. pellucida, M. producta, Eugyra 
pilularis, Cynthia carnea, Glandula arenicola) have not been recorded for local waters by 
any subsequent writers.? On the other hand, one species new to science (Bostricho- 
branchus molguloides) was described by Metcalf from specimens taken within recent years 
in Buzzards Bay. Another species (Didemnum lutarium Van Name) although abund- 
ant and familiar locally, was only recently described for the first time. This species 
had hitherto been confused with Verrill’s Leptoclinum albidum (=T/uteolum), the true 
home of which is north of Cape Cod. The survey has encountered a number of species 
which have not previously been listed in any published report of the fauna of this region. 
Such are Ascidia complanaia, Eugyra glutunans, and Salpa zonaria-cordijormis; also 
(doubtfully determined) Molgula korem, M. citrina, and M. pannosa. 
Twenty-eight species of Tunicata are recorded by Whiteaves for eastern Canada; 
36 species are comprised in the Plymouth list; 45(+ 14?) for the Irish Sea; and 75 for 
the Gulf of Trieste. Ten of the Canadian species and 2 of the Plymouth species appear 
to be common to our Woods Hole fauna. In considering any such comparisons, how- 
ever, it must be borne in mind that practically no papers have been published during 
the past 30 years which deal with the New England Tunicata. 
Only eight charts (190-197) have been presented as illustrating the distribution 
of the bottom-dwelling ascidians of Vineyard Sound and Buzzards Bay. Of these, 
seven are each for a single species, while another is based upon the records for two 
species (Molgula arenata and Eugyra giutinans) concerning which some confusion exists 
(see p. 156). 
Like most of the fixed organisms which have been discussed in the present report, 
the ascidians are of far less frequent occurrence in Buzzards Bay than in Vineyard 
Sound. Indeed, only two species, Molgula manhatiensis and Didemnum lutarium, 
occur with any frequency in the Buzzards Bay dredgings. The following figures permit 
a comparison of the average number of species per dredge haul taken in the two bodies 
of water: 
Vineyard Sound: 
BASU cloclceme EN trebles wrt fou tit uber ¢ dare ard tean?.pe(ek kee eee m3 
Phalarope........ TA tics teres loree iis ).< Sk bapelS hg gat eae Sueur ne Oe, oT 0 
Buzzards Bay: 
Bishibawkess.. Pe AS Rages Out na 5 Teh FS A 
Phalaropests;... =: ews 5. epic | Pe ok eae re is af 
@ Ritter. 
b These are all contained in the list of molgulids having ‘‘ very imperfect descriptions"’ in Herdman’s “ Revised Classification 
of the Tunicata”’ (Journ. Linnaean Soc., vol. xxmt, 1891, pp. 557-652). 
