SYSTEMATIC. 
Tun. 5 
Amaroucium translucidum , p. 249, pi. xxx, figg. 29 & 30, coli, p. 251, 
pi. xxix, figg. 31 & 32, Alaska, characters, structure, Ritter, P. Wash¬ 
ington Ac. iii, n. spp. 
Ascidia adhcerens, Alaska, characters, structure, Ritter, P. Washington 
Ac. iii, pp. 227-230, pi. xxvii, figg. 1-5, n. sp. 
Ascidiella scabra , development of the prostigmata, Selys-Longchamps, 
Arch. Biol, xvii, pp. 675-683, pi. xxiv. 
Botryllus magnus , Alaska, characters, structure, Ritter, P. Washington 
Ac. iii, pp. 255 & 256, pi. xxx, figg. 33-37, n. sp. 
Ciona intestinalis, migration, Della Yalle, Monit. Zool. ital. xii, p. 188 ; 
development of the prostigmata, Selys-Longchamps, Arch. Biol, xvii, 
pp. 675-683, pi. xxiv; development of heart, pericardium and epi- 
cardium, t. c. pp. 499-542, pi. xvii. 
Clavelina, “social” but “compound,” Ritter, Arner. Natural, xxxv, p. 230. 
Corella parallelogramma , development of branchiae, Selys-Longchamps, 
Arch. Biol, xvii, pp. 673-711, pi. xxiv. 
Cyclosalpa pinnata, pp. 223-324, pi. ix, figg. 2-4, pi. x, heart and circulation, 
Schultze, Jena Zeitschr., new series, xxviii. 
Didemnum strangidatum , Alaska, characters, structure, Ritter, P. 
Washington Ac. iii, pp. 247-249, pi. xxix, fig. 28, n. sp. 
Diplosoma listen , origin of colony, Della Yalle, Monit. Zool. ital. xii, 
pp. 186-188. 
Distaplia confusa , Alaska, characters, structure, Ritter, P. Washington 
Ac. iii, pp. 246 & 247, pi. xxix, figg. 26 & 27, n. sp. 
Distoma pulchra , p. 243, pi. xxx, figg. 24 & 25, Alaska, characters, structure, 
Ritter, P. Washington Ac. iii, n. sp. 
Eugyra translucida , Bergen, [no description], Hartmeyer, Meeresfauna 
Bergen i, p. 21, n. sp. 
Heliosadpa virgula, renal organ, Todara, Monit. Zool. ital. xii, pp. 174-176. 
Lithonepkrya , maturation of the egg and fertilization, Julin, C.R. Ass. 
France, 28 e , p. 262 [1900]. 
Molgula , oogenesis, Crampton, J. Morph, xv, Supplem. pp. 29-54, pi. iii. 
M. occulta , structure of excretory organs, Dahlgrun, Arch. mikr. Anat. 
lviii, pp. 627-635, pi. xxxi, figg. 14-20. 
M. graphica , Alaska, Ritter, P. Washington Ac. iii, pp. 23-231, pi. xxvii, 
figg. 6-9; M. norvegida, Bergen, [no description], Hartmeyer, Meeres¬ 
fauna Bergen i, p. 21 ; M. kiaeri , Bergen, Hartmeyer, t. c. p. 55, 
figg. 21 & 22 : n. spp. 
Paramolgida rara , Bergen, [no description], Hartmeyer, t. c. p. 21, n. sp. 
Rhizomolgida, n. g. for A. arenaria, n. sp., Alaska, characters, structure, 
Ritter, P. Washington Ac. iii, pp. 231-237, pi. xxviii, figg. 10-19 2 . 
Rkodosoma, composition, distribution, affinities, Hartmeyer, Arch. Naturg. 
lxvii (Festschrift) pp. 151-168, pi. iv; R. verecundum , external 
structure, internal anatomy, Hartmeyer, t. c. pp. 154-157, pi. iv, 
figg. 3, 4, 5, 8, 12 ; R. papillosum , external structure, internal anatomy, 
Hartmeyer, t. c. pp. 158-160, pi. iv, figg. 2, 9-11; R. semiimdum, 
structure, Hartmeyer, t. c. pp. 162 & 163, pi. iv, figg. 1-7. 
Salpa africana-maxwia , pi. ix, figg. 1, 5-7; S. democratica-mucronata^ 
pp. 223-324, heart and circulation, Schultze, Jena Zeitschr., n. s. 
xxviii. 
Styela yafodatensis, p. 239, pi. xxvii, figg. 20 & 21, truncata , p. 243, 
pi. xxx, figg. 24 & 25, Alaska, characters, structure, Ritter, P. 
Washington Ac. iii : n. spp. 
