ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
287 
Histolysis and Phagocytosis in Coelom of Mature Nereids. — 
Armand Dehorne ( Comptes Rendus Acad. Sci., 1922, 174 , 1043-5). 
As Nereids become sexually mature there is a sarcolyfcic fragmentation 
of certain muscle-fibres, some of which seem to be derived from the 
intestinal musculature. There is a slow myolytic degeneration in both 
sexes during the process of maturation. The muscular debris is 
engulfed by leucocytes, and what have been called elseocytes are aged 
leucocytes laden with sarcolytes which they are digesting. J. A. T. 
Greenland Oligochseta. — Paul S. Welch {Bull. Amer. Museum 
Nat. Hist., 1921, 44, 269-74). The Crocker Land Expedition collected 
at Umanak in Greenland two recognizable species of Oligochseta — 
Lumhriculus variegatus (Muller) and Mesenchytrseus falciformis Eisen — 
and an unidentified immature species of Mesenchytrseus. In view of 
the meagre records from Greenland, even this small collection is of 
interest. J. A. T. 
Cocoon Formation in Limnatus. — G. Matthai ( Journ . Asi. Soc. 
Beng ., 1920, 16 , 341-6, 1 pi.). Observations are recorded on cocoon 
formation in the common Lahore leech, Limnatus (Pcecilob della) granu- 
losa Sav. The number of cocoons laid by a single leech during a period 
of one month (May-June) varied from one to four — viz. one cocoon by 
ten specimens, two by ten, three by two, and four by one specimen. 
Cocoon-laying appears to be induced by tendency to dryness and rise of 
temperature — i.e. by adverse conditions. From a cocoon three or four 
to fourteen vonng ones hatch out in about a fortnight. B. L. B. 
Conditions of Multiplication of Sagitta elegans. — A. G. Hunts- 
man and Margaret E. Reid {Trans. R. Canadian Inst., 1921, 13, 
99-112). The plankton of the Bay of Fundy is very poor in the larvae 
of fishes. The bay is noted for its high tides, strong tidal currents, and 
prevalence of fogs. The surface water remains cool and very salt. The 
effect of these conditions has been tested in regard to Sagitta elegans, 
which is found generally along the Nova Scotia coast in the summer. 
It breeds successfully in the Magdalen shallows of the Gulf of St. 
Lawrence. It does not breed successfully in the Bay of Fundy, as 
shown by the predominance of early embryonic stages throughout the 
season, and by the scarcity of the young. “ In the Bay of Fundy the 
very limited success in breeding is correlated with the attainment of a 
high temperature, with the development in deep water of a special 
surface layer, or with the presence of estuarial conditions. The popula- 
tion of adult forms is too great to be the result of local breeding, and 
must be considered as the result of indraughts around the southern end 
of Nova Scotia from somewhat distant waters.” J. A. T. 
Nematohelm.inth.es. 
Strongylosis in Cattle. — James E. Ackert and W. E. Muldoon 
{Journ. Amer. Veterinary Medical Ass., 1920, 58 , 138-46, 5 figs.). 
Account of an outbreak of strongylosis at Manhattan due to Ostertagia 
ostertagi. Forty steers were visibly affected, twelve seriously, nine 
