TUNICATA. 
185 
procliicta, elmgata, affinis, and normani, spp. nn., Hancock, 1. c. pp. 355-361, 
all British. 
Aacidia amphora^ pmmmophnray ocellata, carnca, Agassiz, and callosa, 
Stiinps., described and tigured in the new edition of Gould’s Invert. Mass, 
pp, 23-26, pi, 24. figs. 330-335, and pi. 23. fig. 318, Massachusetts. 
Corella, gen. nov. Apertures as in Ascidia ; test smooth and diaphanous j 
viscera sinistral ; intestine bending backwards and downwards on the left 
side, passing along the base of the mantle, and rising in front to the anal 
aperture ; branchial sac with the .secondary vessels regularly and beautifully 
convoluted. Typo Ascidia imralldogramma, Miill. New British species : C. 
larvaformis and ovata. Hancock, /. c. pp. 362, 363. 
Ciotia, Sav., Flem., fully characterized (type Asc. intestinalis, Miill.), and 
C. fascicular is, sp. n., described, by Hancock, 1. c. p. 364, Great Britain. 
Cynthia scdbriuscida, sp. n., Sars, Bidr. Christ. Faun. p. 102, Drobak, near 
Christiania, 100-120 fathoms. 
Cynthia pyriformis (Rathke), cchinata (\jI) , placenta (Packard), condylo’- 
mata (Packard), and hirsuta (Agassiz) described and figured by Gould, 1. c. 
pp. 17-20, pi. 23. figs. 320, 321, 3^1,322, 324, and 336, Massachusetts. 
Glandula mollis fmAfbrosa, Stimps., Gould, I c, p. 23, pi. 22. fig. 317, pi. 23. 
fig. 323, and pi. 24. figs. 328, 329. 
Molgxda simplex, inconspicua, and complanata, spp. nn., Alder (MS.) and 
Hancock, 1. c. pp. 365-367, British. 
Molgxda producta, Stimpson, Gould, Invert. Mass. 2nd edit. p. 21, pi. 22. 
figs. 315, 316, Massachusetts. 
Eugyra, gen. nov., Alder (MS.) and Hancock. Body globular, unattached, 
covered with glandular fibrils, and a coating, more or less complete, of fine 
sand. Branchial aperture 6-lobed, anal 4-lobed ; branchial sac without folds, 
but with longitudinal plates or bands ; the meshes regularly convoluted and 
produced into little cones, each being composed of a double spiral coil of ves- 
sels, which spirals, turning in opposite directions, meet at the apex. Type 
Molgxda arenosa, Alder and Hancock, = AT. tuhxdosa of Forbes and Hanley’s 
^Brit. Moll.’ — JE. glohosa, sp. n., Guernsey. Hancock, 1. c. p. 367. 
Boltenia clavata (Fabr.), rxibra, Stimps., microcosxxxxis, Agassiz, and hurk- 
hardti, spp. nn., Agassiz, MS., described and figured by Gould, 1. c. pp. 14-16, 
pi. 23. fig. 325, pi. 24. figs. 337, 338, and 327, Massachusetts. 
Ascidia: composita?. 
M. Ganin publishes a preliminary report on his observations 
eoncerning the development of the eompound Ascidise, espeeially 
Bidemnium gelatinoswn, Sav., and four species of Botryllus. The 
egg of Didemnium produces one embryo and one larva, but this 
larva two individuals of the developed animal, as on the surface 
of the integument of the larva four gems arise, which unite 
themselves afterwards into two individuals. Each individual is 
formed hy two gems of diflferent shape and signification. The 
one, pedunculated, produces the branchial sac, the endostyle, the 
ciliated furrow, the ciliated arch, the nervous and muscular 
systems, and is called thoracic gem^^ [Brustknospe) by the au- 
thor. The other, sessile, produces the greater part of the intestinal 
1870. [voL. VII.] o 
