540 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
orifice. The sperm duct does not extend quite as far as the oviduct 
and terminates on a small papilla. 
The only specimen of this species was according to its label brought 
up on a fish hook "near 2501." Station 2501 is north of Sable Island 
(N. lat. 44° 27', W. long. 60° 20' 15", 26 fathoms, sand and gravel). 
Aside from its different external form, the structure of the branchial 
sac appears to distinguish it sufficiently from M. glacialis (Sars) of 
Norway (see Kiaer, 1893) that species having four or five internal 
longitudinal vessels on the interspaces between folds and but four to 
six stigmata separating these vessels. 
Genus Culeoltjs Herdman, 1881. 
Body more or less egg-shaped, and attached by a very long slender 
stalk. Apertures large, rounded or cleft-like. Branchial sac reduced 
to a framework of transverse and internal longitudinal vessels, the 
resulting meshes not divided into stigmata by interstigmatic vessels. 
Dorsal lamina reduced to a series of languets. Reproductive organs 
consisting of one or more hermaphroditic gonads on each side of the 
body. 
Chiefly a deep-sea genus, several species, however, being recorded 
from water of moderate depth (204 to 924 meters). Greatest depth 
recorded for any species, 4,636 meters. 
Culeolus suhmi Herdman. 
PL 56, fig. 78-81; PI. 57, fig. 83; text-figs. 27, 28. 
1881. Culeolus suhmi Herdman, Proc. Roy. Soc. Edinburgh, vol. 11, p. 86. 
1S82. Culeolus perlatus Herdman, Challenger Rept., Tunicata, pt. 1, p. 115, 
pi. 11, figs. 8, 9; pi. 13, figs. 1,2. 
1885. Culeolus Tanneri Verrill, Rept. U. S. Comm. Fish and Fisheries for 
1883, p. 529, pi. 31, figs. 144, 145. 
1885. Culeolus Tanneri Verrill, Proc. U. S. Nat. Mus., vol. 8, p. 447. 
1904. Culeolus perlatus Michaelsen, Wiss. Ergebn. Deutschen Tiefsee-Exped. 
"Valdiva", vol. 7, p. 183. 
1909. Culeolus suhmi + C. tanneri Hartmeyer, Bronn's Tier-reich, vol. 3, 
suppl., p. 1347. 
Body between wedge-shaped and ovate, deeper near the posterior 
than near the anterior end, the apertures widely separated, the bran- 
chial on the anterior dorsal part, the atrial on the posterior dorsal 
part; dorsal margin of the body between the apertures, and also the 
posterior margin convex, the ventral margin straighter. Oral aper- 
