442 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
From Massachusetts: 
Molgula producta, sp. nov. Doubtful. 
" arenata, sp. nov. = Caesira arenata. 
Cynthia partita, sp. nov. = Tethyum partitum. 
" gutta, sp. nov. = Dendrodoa carnea. 
Also two "Cynthias" from North Carohna. 
In this article Stimpson established two new genera, Glandula 
(for G. fibrosa and G. rtwilis) and Pera (for P. pcllucida). The chief 
characters distinguishing Glandula from Cynthia (as Stimpson used 
the names) were that in Glandula the body was unattached and covered 
with sand or mud. Owing to an error by Traustedt (1880) who 
redescribed Glandula mollis, and stated that the stigmata were curved, 
Glandula was for a long time considered a valid genus, but as shown by 
Hartmeyer (1909a) it has no claims to recognition. Pera also long 
had recognition on account of its pedicel, but the writer follows 
Hartmeyer in considering that it has no anatomical characters requir- 
ing its separation from Caesira [Molgula]. 
In 1854, Stimpson, in his " Synopsis of the Marine Invertebrata of 
Grand Manan," records the following simple ascidians, most of them 
the same as in his last work: 
Ascidia callosa Stimpson = Phallusia prunum. 
" tenella Stimpson = Ciona intestinalis var. tenella. 
" geometrica Stimpson = Chelyosoma madeayanum. 
Glandula fibrosa Stimpson = Pandocia fibrosa. 
" mollis Stimpson = Tethyum inolle. 
Cynthia pyriformis Rathke = Pyura aurantium. 
" cchinata (Linnaeus) = " echinata. 
Boltenia rubra Stimpson = " ovifera. 
" reniformis Macleay = " " 
Packard (1863) recorded the following species from southern Labra- 
dor: 
Ascidia callosa Stimpson = Phallusia prunum. 
Cynthia pyriformis Rathke = Pyura aurantium. 
Cynthia sp. Doubtful. 
Pelonaia arenifera Stimpson = Pelonaia corrugata. 
Boltenia oviformis Savigny = Pyura ovifera. 
In a later work (1867) entitled " View of the Recent Invertelirate 
Fauna of Labrador" he revised and increased the list of species from 
that region so that it stood as follows : 
