8 Verm. 
VERMES. 
from Leuckart’s “ Jahresbericht.’^ [c] Geocentroplwra sphyro- 
cephala^ n. g. & sp., eene landbewohnende Rhabdocoele, op. cit. ii. 
pp. 62-67, pi. ii. [d] De gewone europeesche Land-planarie Geo- 
desmus terrestris, 0. F. M., 1. c. ii. pp. 238-242, pi. xiv. (Abstr. 
Niederl. Arch. Zool. iii. pp. 278-280. 
Moseley’s paper on a young Pelagonemertes is translated or abstracted 
in J. Zool. vi. pp. 10-16, pi. i., and Arch. Z. exp4r. v. p. li. Salen- 
sky’s (Russian) paper on the evolution of an Enterostomum from 
Sebastopol Bay, and on a species of Nadina^ Oul. (Protocols of the 
Naturalists’ Society of Kasan, 1872-73) are only known to the Recorder 
from Leuckart’s “ Jahresbericht,” 1872-1875. 
Hoffmann (3) has studied the evolution of one of the Nemertinea 
enopla ; it is direct, without metamorphosis, the segmentation complete 
and regular, &c. There is no invagination, and no Gastrula is formed. In 
the embryo, the external cell-layer of the “ morula” stage first differen- 
tiates into the ectoderm, followed successively by the next cell- layers, 
which furnish the mesoderm and the endoderm, while the innermost cell 
portion undergoes a fatty degeneration, and constitutes the first contents 
of the embryonal intestine. About the time when the anterior and pos- 
terior flagella disappear, the mouth and afterwards the vent are formed 
through perforation, and 4 eye-spots become visible. The sense-system 
is developed from the ectoderm, the subcutaneous muscular layers and 
the muscles of the trunk (proboscis) from the mesoderm, while the glan- 
dular part of the trunk is formed from the endoderm. 
Genera and Species. 
Linens corrugatus, sp. n., McIntosh, Ann. N. H. (4) xvii. p. 422, Ker- 
guelen Island. 
The following species of Eastern Turbellaria dendroccela digonopora are 
described and figured in Collingwood’s paper (2) : — 
Thyzanozoon alderi^ sp. n., p. 88, pi. xvii. fig. 1, Labuan ; allmanni, sp. n., 
p. 89, pi. xvii. fig. 2, Singapore ; anropunctatum^ Keel., p. 94, pi. xviii. 
fig. 13 (Aripo). 
Acanthozoon, g. n. “ Caput subdiscretum, tentaculis parvis approxi- 
matis, corpus supra spinulis brevibus nigris ubique instructum.” A. 
armatuniy Keel., p. 95, pi, xviii. fig. 14, papilio, K., ibid. fig. 15, Ceylon. 
SphyngicejJS, g. u. “ Corpus loeve, caput discretum, tentaculis magnis 
subdistantibus ; ocelli occipitales et capitales.” S, lacteus^ sp. n., p. 90, 
pi. xvii. fig. 3, Singapore. 
Proceros concinnus, sp. n., p. 90, pi. xvii. fig. 4, Labuan ; hancochanus^ 
sp. n., p. 91, pi. xvii. fig. 5, and huski^ sp. n., p. 91, pi. xvii. fig. 6, Singa- 
pore. 
Eurylepta fusca^ Keel., p. 95, pi. xviii. fig. 16 ; atraviridis, K., p. 95, 
pi. xviii. fig. 17 ; undulata^ K., p. 95, pi. xviii. fig. 18 ; violacea^ K., 
p. 96, pi. xviii. fig. 19; didcis, K., p. 96, pi. xviii. fig. 20; purpurea, K., 
p. 96, pi. xviii. fig. 21 ; viridis, K., p. 96, pi. xix. fig. 22 ; affi^nis, K., p. 96, 
pi. xix. fig. 23; cerehralis, K., p. 96, pi, xix. fig, 24 ; striata, K., p. 97, 
