64 Moll 
MOLLUSCOIDA. 
Waldhemia : a very large species with exceedingly small animal, 
from 300 fathoms, between Gibraltar and Madeira ; Willemoes-Suhm, 
P. R. Soc. xxiv. p. 578. 
Megerlia truncata (L.) : the var. monstruosa (Scacchi) is caused by 
the shortening of the stalk ; Monterosato, Poche note, &c. p. 3], 
p. 4. 
Argiope scminulum (Phil.) distinct from neapolitana (Scacchi) and 
A, appressa (Forbes), found at Sciacca, and distinct from both; id. 
1. c. p. 5. 
RHYNCIlONELLlDiK. 
Airetkiy g. n., near Rhynchonella^ but beak straight and arms not 
coiled. A gnomon^ sp. n., N. Atlantic, 1100-1400 fathoms, 6G^-G3^ N. 
lat. Jeffreys, Ann. N. H. (4) xviii. p. 251, and P. R. Soc. xxv. p. 199. 
DiSGINIDiE. 
Discina atlantica (King, 1868), found alive in the N. Atlantic, 56^ 
N. lat. G90-2400 fathoms, probably = fallens (S. Wood) from the 
coralline crag ; Jeffreys, Ann. N. H. (4) xviii. p. 252. 
TUNICATA. 
Histological description of the endostyle of several Tunicata, by 
H. Fol, Morph. JB. 1875, pt. ii. 
Ascidiidac. 
Boltenia : a fine species in the Atlantic near the coast of N. America, 
in 1700 fathoms ; Willemoes-Suhm, P. R. Soc. xxiv. p. 578. 
POLYCLINID^. 
Amaroucium lafonti, sp. n., P. Fischer, Act. Soc. L. Bord. xxx. p. 9, 
Arcachon, on Zostera. 
Diplosomatid^. 
A. Giakd insists on the distinctness of the families Didemnidce and 
Diptlosomatidoe^ the former being provided with numerous calcareous 
spicules in the tunica ; and he describes the embryogeny of a^ species of 
the latter family, Astellium spongiiforme (Giard), pointing out that the 
common cloaca in it has the morphological value of an individual, like 
the cyathozoid of Pyrosoma [Zool. Rec. xii. p. 210] ; he therefore thinks 
that the family Diplosomatidce must be removed to the order Lucice. 
OR. Ixxxi. (1875), pp. 1214-1216 ; abstract in Ann. N. H. (4) xvii. 
pp. 479 & 480. 
