854 



SCIENCE. 



[N. S. Vol, VIII. No. 207^. 



lobsters at the Fish Commission Hatchery, 

 and concluded that the larger number of 

 eggs were laid during the latter half of 

 July and the first two weeks of August. 

 These eggs are normally carried by the 

 female until the following spring, when 

 they hatch during May, June and July. I 

 regret that I have no specific data on the 

 breeding habits of Crangon vulgaris, but I 

 have every reason to suppose that it is bear- 

 ing and hatching eggs with its characteris- 

 tic industry. Mr. F. P. Gorham found 

 Virbius zostericola carrying eggs in all stages 

 of development from the first of June to 

 the first of September ; the period of incuba- 

 tion lasts for about two weeks. Falcemonetes 

 vulgaris was found with eggs in early stages 

 of segmentation on June 20, and on the 

 same date other individuals were found 

 bearing late blastoderm stages and fully- 

 formed embryos. The larvse of Falcemonetes 

 are excessively abundant in the auftrieb 

 during July and August. The young of 

 Squilla was occasionally taken in the tow- 

 net during August, and was abundant on 

 the surface of the Gulf Stream. A beauti- 

 ful Heteromysis, bearing deep green eggs, was 

 frequently dredged on the shelly bottom 

 east of ISTobsque during June and July. 

 The young of Ciima were taken in the 

 skimmings on June 14. 



The Amphipods are by no means as 

 abundant as during the spring. Mr. F. M. 

 Watson found Avijihitho'e compia breeding 

 through July and the first week or two of 

 August and Callioplus Iceviuseulus with eggs 

 on August 1. Orchestia agilis was repre- 

 sented by innumerable young during the 

 first two weeks in July; Podocerus falcatus 

 was taken with eggs during the last two 

 weeks of July and the first two weeks of 

 August. Earlj' in August a large number 

 of Caprellse bearing eggs were taken. Ta- 

 lorehestia has been found with eggs in late 

 stages of development on June 14, and Or- 

 chestia agilis with eggs and embryos on June 



20. A tube-dwelling amphipod, probably 

 Cerajms tubularis, bears eggs, some of which 

 are in early stages of development on July 

 4. Hyperia is frequently taken during June,, 

 and its large, almost absolutely transparent 

 eggs would form excellent material for cer- 

 tain lines of biological research. 



Among the Isopods, Idotea rohusta was 

 found with eggs on July 17, and again on 

 August 12. Dr. J. P. McMurrich has 

 found Jcera marina breeding in the middle 

 of June, when his first observations were 

 made, and from then without interruption 

 until the first week in September, the time 

 of his departure from the laboratory. 

 Tanais vittatus was found with eggs in vari- 

 ous stages of development early in August, 

 and Dr. W. M. Wheeler has found the eggs 

 of Armadilidium vidgare around old logs at 

 Butler's Point late in June. 



Copepods are, of course, abundant in all 

 the surface material, and the parasitic Cope- 

 pods found attached to the various fishes 

 almost invariably bear egg-capsules which 

 contain embryos in various stages of devel- 

 opment. Attached to the floating seaweeds,, 

 boards, etc., which are washed on to the 

 shore from the ocean are two or three 

 species of ' goose barnacle,' which yield- 

 abundant embryonic material. 



Dr. Wheeler found Limnetis gouldli breed- 

 ing in small fresh- water ouds on Penzance, 

 June 6-13, 1892. Associated with these 

 were many specimens of EuUmnadia agassizii 

 and Bosmina, both sexually mature. 



The Pycnogonids breed during July, 

 August and September. Dr. T. H. Morgan 

 has recorded the appearance of Tanystylum 

 orbicular e with eggs on July 1st ; Fallene 

 empusa carries eggs throughout the summer, 

 and Phoxicliilidium viaxillare during August 

 and September. 



Limidus was found depositing eggs on, 

 June 19, and eggs were artificially fertil-, 

 ized on July 12, though the females were 

 then nearly spent. 



