196 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Non-marine Copepoda from Spitsbergen.* — Mr. D. J. Scourfield 
obtained, from mosses collected during the Conway expedition to Spits- 
bergen in 1896, a specimen of a Harpacticid, which, however, was 
damaged and could not be determined, and a few examples of Cyclops 
bisetosus Reliberg. Two of the latter exhibited peculiar abnormalities. 
Eye of Corycaeus.j — Dr. A. Steuer describes the structure of the 
eye in Corycseus anglicus Lubbock, confirming in general what has been 
observed in the allied Sappliirina and Copilia, but also furnishing more 
intimate details, especially in regard to the pigment-rod. His experi- 
ments led him to the conclusion that, in spite of its complexity of struc- 
ture, the eye is functionally very imperfect, admitting of little more 
than perceptions of light and shade. 
New Parasitic Copepods.if — Surgeon P. W. Bassett-Smith has 
found a large number of new parasitic Copepods on fishes at Bombay. 
He erects a new genus Helleria for a member of the family Dichelesthina 
taken from the gills of Cybium guttatum, and describes thirteen new 
species of other genera. 
North American Species of Diaptomus.§ — Mr. F. W. Schacht gives 
a descriptive list of these, with diagnostic keys, and data as to distribu- 
tion. Although the genus is the most cosmopolitan of its family, no 
species is known to be common to the mainlands of Europe and America, 
—a fact the more remarkable since almost the direct opposite is true of 
the companion genus Cyclops , of which only one or two species can be 
called peculiar to America. 
Annulata. 
Regeneration in Earthworms. || — Prof. E. Korschelt experimented 
with Lumbricus rubellus, Allolobophora terrestris , &c., and observed 
regenerative phenomena of much greater magnitude than Morgan and 
Hescheler saw. It seems that a small piece of 10-20 segments or so re- 
generates more successfully than a long piece. One piece of L. rubellus , 
consisting of 23 segments, regenerated 25 segments in front, and 62 
behind. Pieces from the middle of the body are most regenerative ; the 
process seems more difficult in the regions of head, gonads, clitellum, 
and tail. Yet no part can be said to be incapable of regeneration. 
Origin of Setigerous Bulbs and Nephridia in Annelids.^ — M. Aug. 
Michel has studied this in the regeneration of Nephthys and Allolobophora 
foetida , &c. In the caudal regeneration, the setigerous bulbs are ecto- 
dermic, the setigerous sacs mesodermic , and the nephridia ectomesodermic. 
Thus the results agree on the whole with those of the normal organo- 
genesis, and favour the idea of parallelism between regenerative and 
embryonic processes. 
* Proc. Zool. Soc., 1897, p. 792. 
| Zool. Jalirb., xi. (1897) pp. 1-12 (1 pi. and 1 fig.). 
t Ann. Mag. Nat. Hist., i. 7th series (1898) pp. 1-17 (7 pis.). 
$ Bull. Illinois Lab. Nat. Hist., v. (1897) pp. 97-207 (15 pis.). 
|| SB. Ges. Nat. Marburg, 1897, pp. 72-105. See Zool. Centralbl., v. (1898) 
pp. 50-2. H Comptes Rendus, exxvi. (1898) pp. 50-2. 
