ZOOLOGY AND BOTANY, MIOKOSCOPY, ETC. 239 



points this crustacean shows relationship to known families of 

 Isopoda, notably Anthuridse and ^gid^e. It differs from the An- 

 thuridte, however, not only by the anterior pereiopoda being simple, 

 but also by the position of the embryo in the egg, the flexure being 

 towards the dorsal side. The male differs greatly in appearance 

 from the female. On either side of the dorsal organ of the embryo 

 is a remarkable jointed larval appendage, without parallel in any 

 other Edriophthalm. These may point to the former existence in 

 the Edriophthalm larva of embryonic locomotive appendages, of 

 which they are a remnant, or may be simply developed for the 

 attachment of the larva to the pinnate hairs of the abdomen of the 

 female. 



Marine Species of PMlougria.* — C. Chilton describes a new 

 species of PMlougria (P. marina) from near Sydney, and attaches 

 some importance to the peculiar setfe arising from the dactylos of 

 each thoracic leg. All terrestrial Isopoda are descended from marine 

 forms, but this specimen resembles the terrestrial PMlougria so closely 

 that the author considers it is a terrestrial form that has in the 

 struggle for existence been forced to return to a life in the sea. 



Amoeboid Movements of Spermatozoa of Polyphemus pedicnlus.t 

 — 0. Zacharias gives us some further information as to the amceboid 

 characters of the spermatozoa of Polyphemus, to which attention has 

 been already directed by Leydig. The recent observer corroborates 

 most of the earlier histologist's work, but takes exception to the 

 limited number of the colossal seminal elements ; he has seen almost 

 always thirty to forty of these structures arise from the testis ; the 

 difference is to be perhaps explained by Zacharias having examined 

 specimens that were fully adult. The spermatozoa are exceedingly 

 active in 3 per cent, salt solution ; experiments with a 10 per cent, 

 solution of sugar revealed some extraordinary phenomena. While 

 some became spherical, others retained their spindle shape and gave 

 off an excessively long pseudopodium which, in extreme cases, 

 equalled in length the male of Pohjpliemus ; well may the author say 

 that this is a unique case in animal histology. Other experiments 

 are detailed, and the conclusion is come to that we know of no other 

 organic structures which possess the power of forming pseudopodia in 

 so remarkable a manner as the spermatozoon of Polyphemus. 



Parasitic Copepod of the Clam4— Prof. E. E. Wright describes 

 a copepod, Myicola metisiensis (nov. gen. et sp.) from the clam 

 {Mya arenaria), the female being parasitic in the gill-tubes and the 

 male free in the mantle cavity. The genus approaches Ergasilus in 

 the conformation of the posterior antennae and in the absence of the 

 posterior maxillipedes in the female, in other points it approaches the 

 Lichomolgid^, The anatomy of its soft parts appears to agree com- 

 pletely with Delia Yalle's Lichomolgus sarsii. Its development 



* Proc. Linn. Soc. N. S. Wales, ix. (1884) pp. 463-6 (1 pi.). 

 t Zeitschr. f. Wiss. Zool., xli. (1884) pp. 252-8 (1 pi.). 

 X Amer. Natural., xix. (1885) pp. 118-24 (1 pi.). 



