342 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
region, by a gut-sinus homologous with the dorsal vessel and by a 
ventral vessel ; in the thoracic region, by a dorsal vessel and a gut-sinus 
homologous with the ventral vessel. The oxidation of the blood is 
effected posteriorly by the gills, anteriorly by the gut. The “ cardiac 
body ” is not a gland but a valve. 
Where the peritoneum invests the abdominal intestine and the 
nephridia, it is a chloragogen-bearing connective tissue. In the intes- 
tinal epithelium there are chloragogen grains and granules differing in 
structure and chemical composition. They are especially abundant about 
the stomach and gullet. 
The chloragogen of the peritoneum, of the nephridia, and of the 
connective tissue between the intestinal sinuses contains guanin. The 
chloragogen of the lymph-cells, blood-cells, and gut contains no guanin, 
but is chitinoid, and perhaps includes ferment as well. At any rate the 
term chloragogen is applied to concretions differing in physiological 
import and origin. 
Deep-sea Polychseta of Eastern Mediterranean.* — Dr. E. von 
Marenzeller thinks that the twenty-five species of Polychsetes dredged 
in deep water of the Mediterranean do not represent the whole Annelid- 
fauna, but rather afford an indication of the difficulty of obtaining them. 
Three new species : — Pholoe dorsipapillata, Protula Marioni, and Vermilia 
agglutinata are described. Panthalis oerstedi , which extends from the 
Scandinavian coasts to outside Gibraltar, the similarly high northern but 
also Madeiran Apomatus globifer , and the North American Eunice flori- 
dana are now known to enter the Mediterranean. Twelve species of 
Serpulidae were collected. 
New Phreoryctes.f — Prof. A. Giard describes a new species of this 
rare type of earthworms, which he found near Boulogne-sur-mer, and 
which he calls P. endelca as the setae are not developed beyond the eleventh 
metamere. A short description is given of the new species, and a key 
is added by which the now five described species may be distinguished. 
Californian Eudrilidse.f — Mr. G. Eisen has lately established a new 
genus of this family which he calls Deltania ; under it he groups all 
species which would be referred to Microscolex , but for their having a 
deltoid arrangement of the ventral setae surrounding the generative and 
especially the male pores. In California there are at least three species of 
the genus, all of which appear very sensitive to dryness and heat, and are 
difficult to find except from February to April, in the neighbourhood of 
San Francisco. Detailed descriptions are given of D. elegans , D. Troyeri , 
and D. Benhami, and a table shows their differences and their points of 
distinction from D. Poultoni and D. dubia. ArgilopJiilus is a new genus 
which extends from California to British Columbia ; its species are the 
most common of Californian earthworms, but to find them in summer 
it is necessary to dig down six feet or more, when they may be found 
encysted in a chamber of clay, where they pass the dry season. A very 
full account is given of the anatomy of this genus, which stands nearest 
* Denkschr. K. Akad. Wiss. Wien, lx. (1893) pp. 25-48 (4 pis.), 
t Comptes Eendus, cxviii. (1894) pp. 811-4. 
i Mem. Calif. Acad. Sci., ii. (1894) pp. 21-62 (18 pis.). 
