582 



SCIENCE. 



[N. S. Vol. IX. No. 225. 



close of the month. The density varied 

 from 1.0208 to 1.0225. 



Vertebrata. The fishes present no fea- 

 tures of special interest, as the summer 

 forms are still present, and no species is 

 breeding. The surface skimmings show a 

 few fry at intervals. On the 20th one or 

 two larval flatfish, in which the eyes had 

 just begun to migrate, were taken. About 

 the 25th three smooth dogfish, Galeus canis, 

 which had been confined in the ' Pool,' were 

 killed, and twenty-seven embryos, 10 to 

 11 cm. long, were found in the oviducts. 



Crustacea. None of the adult brachyura 

 examined were breeding. Zoese were con- 

 spicuous in the auftrieb during the early 

 part of the month, and later various mega- 

 lops were abundant. 



The zoea of CalUnedes hastatus was the 

 most abundant form, lasting about two 

 weeks. The megalops of this species was 

 plentiful at all times, particularly on the 

 ISth. Specimens in the laboratory changed 

 to the beautifully-spotted 'first adult' on 

 September 27th, 29th, and October 3d. An- 

 other zoea (which I have not identified) was 

 very abundant in the latter part of August 

 andthe firstweekof September, disappearing 

 about the 11th. It resembles the zoea of 

 CalUnectes, but has a longer rostrum and 

 dorsal spine, and the exopodite of the 

 antenna is a straight blade as long as the 

 rostrum. 



Among the Anomura, the larvte of Hlppa 

 had disappeared on September 4th. Eupa- 

 gurid zoese swarmed in August and the 

 first week in September, and were present 

 in decreasing numbers throughout the 

 month. The ' glaucothoe-stage ' was abun- 

 dant at all times. Data relating to the 

 breeding of Eupacjurus bernhardus and E. 

 pollicaris are scanty, but the few females of 

 the latter species which were examined 

 were without eggs. E. annulipes was brought 

 in on the 4th, when a few were bearing eggs 

 in early stages of development. Females of 



E. longicarpus with eggs were taken as late 

 as the loth. 



Among the Macroura, specimens of Vir- 

 hi'us zostericola had eggs in the later stages 

 on the 11th. Larvse and young adults, 

 ranging in length from 5 mm. to 10 or 

 15 mm., were present in the skim- 

 mings. Those of small size persisted 

 throughout the month. Palcemonetes vul- 

 garis was not breeding, but the larvse 

 (mostly the ' fifth ' and ' sixth ' stages of 

 Faxon) were occasionally taken, and to- 

 ward the end of the month several of the 

 ' first adult stage ' were found. A specimen 

 of Crangon vulgaris with eggs was obtained 

 on the 19th. Heteromysis, dredged at Vine- 

 yard Haven on the 12th, and off Nobska 

 Point about a week later, had well-ad- 

 vanced eggs in the brood-pouch. 



No adult Isopoda were examined, but 

 immature Idotea robusta and /. irrorata, 

 ranging in length from 2 mm. upward, 

 frequently appeai'ed in the skimmings. 



Among the Amphipoda, a minute form, 

 apparently a species of Montagua, was very 

 common among the hydroids. On Septem- 

 ber 21st nearly all were carrying eggs in 

 various stages of development. Many Ca- 

 prellcB obtained at the same time bore em- 

 bryos approaching maturitj\ 



Squilla larva?. (5 mm. long) appeared at 

 intervals throughout the month. Copepods 

 were abundant at all times. DlastyUs was 

 taken in the evening and is apparentlj' at- 

 tracted by any artificial light. On the 12th 

 a number of ' Goose Barnacles ' had eggs 

 in all the later embryonic stages, and some 

 began to liberate nauplii about this date. 



Mollusca. Scycotijpus continued to de- 

 posit its ' egg-strings ' during tlie first two 

 weeks of the month. The breeding period of 

 Crepidula fornicata had closed, but onthel9th 

 I found a few specimens of Crepidida pilana 

 with eggs in early cleavage stages. The 

 breeding period oi Littorina Uttorea in Ameri- 

 can waters is not known. On the 20th great 



