ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 607 



Lysiosquilla excavatus from a long-spin ed Lysioerichthus, L. maculata 

 from a similar larva with short spines, Gonodactylus from Gonerich- 

 thus ; and probably Erichthalima is a young Coronida. 



New Isopod.* — Dr. E. Koehler proposes the name of Joeropsis 

 breiicornis for a new Isopod which he found in the island of Sark, 

 where it lives among sponges and simple Ascidians. As its name im- 

 plies it stands nearest to Jo2ra, from which it differs essentially by the 

 characters of its antenna?. It is from 2 to 2 • 75 mm. long ; the seven 

 thoracic somites are separated from one another, at the sides, by spaces 

 of some size ; the integuments are colourless, save near the head, 

 where there is a large brown spot. The head is large and quadri- 

 lateral ; the lower antenna? have a peduncle composed of four joints, 

 the first of which is very short ; the second is longer, but wider than 

 long, and swollen along its outer edge ; the third is almost triangular, 

 and is, as it were, placed in an angle between the second and fourth 

 joints ; the fourth joint is oval ; the flagellum of this antenna is very 

 short, and is made up of seven or eight rings which decrease rapidly 

 ,in size from the proximal to the distal. The superior antenna? have 

 a peduncle of five joints and no flagellum. In a number of characters 

 the new genus resembles Jcera, but in addition to those already 

 mentioned, it differs also in the form of the maxillipeds, and in the 

 appendages of the sixth abdominal segment. 



Entoniscus mcenadis.t — M. A. Giard found an Entoniscus on the 

 left side of a Carcinus mcenas, in the midst of the hepatic creca of its 

 host. It differs from E. cavolinii, not only in colour but also by the 

 characters of its embryo; this has no nauplius-eye, and there are 

 differences in the lateral eyes. M. Giard accepts the theory of pro- 

 tandrous hermaphroditism with regard to Hemioniscus, Entoniscus, and 

 other less abnormal Bopyridae. 



MM. A. Giard and J. Bonnier also report \ that the cuticle of 

 Entoniscus is covered with small chitinous hairs, which are, no doubt, 

 destined to aid the movements of the parasite in its host ; in the 

 caudal region the enveloping membrane which belongs to the crab 

 is strengthened by a chitinous secretion, in which there is an orifice 

 by means of which the parasite is put into communication with the 

 branchial cavity of the crab. The incubation-cavity is more com- 

 plicated than Kossmann supposes. The authors' studies on develop- 

 ment have been few, but they are able to say that invagination is 

 epibolic. E. Kossmanni found on Portumnus variegatus, and E. 

 fraissi on P. holsatus, are new species. 



Australian Fresh-water Entomostraca.§ — Prof. G. S. Brady gives 

 a list of the species of fresh-water Entomostraca that have already 

 been described from Australia, and an account of fifteen species, 

 eleven of which are new ; these last belong to the genera Limnetis, 

 Eulimnadia, Eslheria, Gypris, CMamydotheca, Gydridopsis, Notodromos, 

 and Candona. 



* Ann. Sci. Nat. Zool., xix. (1885) Art. 1, 7 pp. (1 pi.). 



t Comptes Rendus, cii. (1886) pp. 1034-6. J Tom. cit., pp. 1173-6. 



§ Proc. Zool. Soc, 1886, pp. 82-93 (3 pl3.). 



