ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
177 
complex structure of those of the Thoracostraca. The embryo partly 
resembles that of Grapsion and Portunion, and, notwithstanding the 
darkness of the medium in which it is developed, it is strongly pig- 
mented with brown and green ; the eyes are large. The genus, though 
closely allied to Grapsion, may be clearly distinguished by the form of 
the first incubatory plate and the ovary of the female, and by the 
arrangement of the median ventral hooks of the male. 
New and little-known Semiparasitic Copepoda.* — Prof. C. Claus 
treats chiefly of the Lichomolgidee and Ascomyzontidae. As a result of 
his researches he offers a revised diagnosis of the genus Lichomolgus^ 
eight species of which may be certainly recognized ; in addition to this 
a new species found on sea-anemones and called L. Anemoniae is described. 
The genera Sabelliphilus and Anihessitts are re-defined, and a new genus 
ParantJiessim is described ; it is known only from temale forms of a new 
species P. Anemoniae. Pseudanthessius g. n. (with a new species P. 
gracilis) is distinguished by the peculiarities of its gnathites, and the 
unjointed inner branch of its fourth pair of feet. The Lichomolgidee 
appear to form a definitely limited group of the Corycaeidse, and the 
Notodelphyidae, which live with Ascidians, may be regarded as closely 
allied to, and having a common ancestry with them. A revised defini- 
tion of the group is given. 
The author next deals in similar fashion with the Ascomyzontidae, of 
which Dermatomyzon [D. elegans sp. n.), Echinocheres (P. violaceus and 
E. minutus spp. nn.) are new genera. A new group will, when our 
knowledge is more advanced, have to be made for Calagidium 
vagahundum. 
Gastrodelphys.f — Dr. J. H. List has a monographic account of this 
perplexing genus, the anatomy of which is described in detail. He 
cannot agree with Graeffe in associating it with the Notodelphyidm, and 
thinks it is necessary to make a special group for it which will connect 
the Notodelphyidae, which have biting mouth-parts, with the Siphono- 
stomata, of which it is a family. The species live parasitically on the 
gill-filaments of tubicolous worms, have a short conical suctorial pro- 
boscis provided with teeth, a pair of mandibles, no maxillae, and two 
pairs of maxillipeds. Of the two pairs of antennae the anterior have five 
joints, and the hinder three hooks and a stalked sucker on their terminal 
joint. There is a median eye. Four of the thoracic segments have 
rudimentary swimming feet. The matricial cavity is a fold of the 
fourth thoracic segment. The abdomen is short, and has a furca. In 
addition to G. Clausi of Graeffe the author describes G. Myxicolae sp. n. 
found on Myxicola infundibulum. 
Vermes. 
Texture of Central Nervous System of Higher Worms. { — Herr 
B. Haller, in his investigations into the texture of the central nervous 
system of the carnivorous Polychaeta, made especial use of Lepidasthenia 
elegans. He finds that the mode of origin of the ventral medullary 
* Arbeit. Zool. Univ. Inst. Wien (Clans), viii. (1889) pp. 327-70 (7 pis.). 
t Zeitschr. f. Wiss, Zool., xlix. (1889) pp. 71-146 (4 pis.). 
X Arbeit. Zool. Univ. Inst. Wien, viii. (1889) pp. 175-312 (5 pis.). 
1890. N 
