ZOOLOGY. 579 



erence to the coincidence of its movements with the moon, and when 

 the worm makes its appearance it does so in snch vast numbers that it 

 is collected by the natives as a dainty article of food, and is so much 

 prized that formal presents of it are often sent considerable distances, 

 from certain chiefs, to others whose small dominions do not happen 

 to be visited by the Mbalolo." The worms only make their appearance 

 to spawn, and "the time of their appearance is the day of the last 

 quartering of the moon in October, unless that fall at the beginning of 

 the month, in which case there will intervene another lunar month." 

 So says the Eev. T. Powell, and he adds that "the observations of 

 many years, made by many old European inhabitants as well as by the 

 natives, show that, if from the time of spawning in October, we reckon 

 354 or 355 days, that will bring us to another spawning, unless such 

 reckoning terminate at the end of September or the beginning of Oc- 

 tober, say from the 1st to the 4th day. In that case the reckoning 

 must extend to 383 or 384 days, when the Palolo will appear. Thus, 

 instead of an interval of only twelve lunar months, one of thirteen will 

 occur. Whether the moon, directly., has anything to do with the move- 

 ments of the Palolo, may be still an open question, but that there is a 

 coincidence between the two, seems to be beyond doubt. But although 

 the great host of Palolo makes its appearance as indicated, according 

 to Mr. Powell, "there is a second appearance of Palolo each year, 

 occurring a month after the first, consisting of such worms, probably, 

 as were not sufficiently mature to spawn in October, or, it may be, of 

 an other species." 



VII. ARTHEOPODS. 



MEROSTOMES. 



Trilobites. 



Edwards (H. Milne). Compte rendu des nouvelles recherches de M. Walcott sur la 

 structure des Trilobites, suivi de quelques considerations sur I'interpretation 

 des faits aussi constates. Avec 3 pl. Ann. Sc. Nat., (6,) Zool., t. 12, Art. No. 3. 

 (33 p.). 



Schmidt (Fr.). Revision der ostbaltischen silurischen Trilobiten nebst geognostischer 

 Uebersicbt des ostbaltischen Silurgebiets. Abth.l. Pbacopiden, Cheiruriden und 

 Encrinuriden. Mit. 16. Taf. Mem. Acad. St. Petersburg., 7. Ser., No. 1. (237 

 p.— M. 15.) 



XipTioaura. 



Moseley (H. N.). The Development of Limulus. Ann. & Mag. of Nat. Hist. (5), v. 9, 

 ' p. 412. 



Moseley (H. N,). Limulus. Nature, v. 25, p. 582. 



Packard (A. S., jr.). Is Limulus an Arachnid? Amer. Naturalist, v. 16, p. 287-292; 

 Ann. & Mag. of Nat. Hist. (5), v. 9, p. 369-374. 



Is Limulus an Arachnid ? 



An abstract of Prof. Eay Lankester's contention that "Limulus [is] an 

 Arachnid" has been reviewed by Professor Packard. It is recalled that 



