ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 699" 



distinct species morphologically, but it has some physiological peculiari- 

 ties. There is a great abundance of males in copulation throughout the 

 whole year, and independently of the degree of concentration. There 

 is predominant viviparity in winter, and oviparity in summer. There is 

 no evidence of parthenogenesis. 



Distribution of Terrestrial Isopods Introduced into Australasia.* 

 Charles Chilton communicates some notes on the distribution of Porcellio 

 scaler, P. Icevis, Metopo nor thus pruinosus, and Armadillidium vulgare, 

 which appear to have been introduced into Australasia, most probably 

 by the unconscious action of man. 



New Genus of Isopods.j — Harriet Richardson describes, from the 

 Eastern Pacific, an Isopod which does not appear to belong to any of 

 the known families of the order. Although found free, it is probably a 

 parasite, for some of its characters exhibit marked degeneration. All 

 the abdominal appendages have been lost ; it is without eyes, and has 

 prehensile legs. The author names it Colypurus agassizi, g. et. sp. n., 

 and makes it the type of a new family Colypuridae. 



Sense-Organs of Limnadia lenticularis.J — M. Nowikoff gives a 

 very full account of the anatomy of this somewhat rare Phyllopod. A 

 note on the sense-organs only may be given. These consist of compound 

 eyes, simple eyes, a parietal organ, which is probably an organ of touch, 

 and which cannot be compared to the frontal organ of Branchipus ; 

 sense-organs of the first antennas ; sense-bristles of the second antennae. 

 It was also found that the abdominal bristles, the leg bristles, and the 

 rowing antenna? bristles, are provided with sense-cells ; the spines of 

 the abdomen are protective simply. A darkly staining continuation of 

 the sense-cells runs along the axis of the tactile bristles of the leg. 

 The sense-cell complex is spindle-shaped, and lies at the base of the leg. 



Annulata. 



Commensals in Tubes of Cha3topterus.§ — H. E. Enders found, out 

 of 99 tubes, 88 with commensals. These included two Annelids of the 

 genus Nereis, 176 crabs of the species Poly onyx macrocheles, Pinnixa 

 chcetopterana, Pinnotheres mactdatus, and one species of the "stone- 

 crab," Meaippe, all occurring in most cases near the orifices of the U-tube, 

 and advantageously located for securing food. "Whether or not the 

 commensalism is an advantage to Ghcetopterus, it seems to be a decided 

 benefit to the crabs, Pohjonyx and Pinnixa, grown specimens of which 

 are rarely found outside of the tubes. The advantage to the crabs is 

 very clearly marked by their prolonged breeding season — virtually an 

 example of protected industry." 



Neurofibrils in Ganglion Cells of Annelids.|| — Agostino Gemelli 

 has used the methods of Golgi, Apathy, Bethe, Donaggio, Cajal, and a 



* Ann. and Mag. Nat. Hist, xvi. (1905) pp. 428-32. 



t Bull. Mus. Compar. Zool., xlvi. No. 6 (1905) pp. 105-6 (1 pi.). 



% Zeitschr. wiss. Zool., lxxviii. (1905) pp. 561-619 (4 pis.). 



§ Amer. Nat., xxxix. (1905) pp. 37-40. 



|| Anat. Anzeig., xxvii. (1905) pp. 449-62 (6 figs.). 



