ZOOLOGY AND BOTANY, MICKOSCOPY, ETC, 6.71 



As indicated in the names of the families, this classification depends 

 on the number of capitular plates. 



Sub-order Balanidse (Sessile Cirripedes). 

 I. Unsymmetrical forms. 



Family (1) Verrucidae. 

 II. Symmetrical forms. 



Family (1) Octomeridae. 

 „ (2) Hexameridse. 

 „ (3) Tetrameridse. 



These families are founded on the number of pieces in the test. The 

 paper includes a synoptical list of genera. 



New Chondracanthid.* — MM. C. Vaney and A. Conte have found 

 in the gill-chamber of Glinus argentatus Kiss., a parasitic Copepod be- 

 longing to the genus Diocus Kroyer. Kroyer's genus was established 

 for J), gobinus Fabr., a parasite of the fresh-water fish Gottus gobio, and 

 the author's form differs from the type species in the absence of all 

 segmentation in the male, whereas in D. gobinus the abdomen in the 

 male has six segments. Nevertheless, the new form is placed in the 

 genus Diocus as D. clini. In Clinm argentatus one specimen of the 

 parasite only was found in the gill-chamber, but both sides of the body 

 are usually affected. The pigmy male is usually free in the bottom of 

 the gill-chamber. Parasitised fish have rudimentary genital organs, 

 and were found only in the Eade du Lazaret in the roadstead of 

 Toulon. As Clinus argentatus has been studied at various points on 

 the shores of the Mediterranean, there seems no reason to doubt that 

 this is another case of that localisation of parasites to which attention 

 has already been drawn. 



Studies on Argulidae.f — Herr L. von Nettovich describes Argulue 

 viridis sp. n., a fresh-water form new to Europe, takes a survey of the 

 other species, and gives an account of the structure of the shell-gland 

 and integumentary glands. The shell-gland opens at the base of the 

 second maxillipedes ; it consists of terminal saccule, urinary canaliculi, 

 and ureter (the last arising from an inturning of the skin). Shell- 

 gland and antennary gland are homodynamous. There are both uni- 

 cellular and compound integumentary glands, and two types of each. 



Development of Nebalia geoffroyi.J — Prof. Peter Butschinsky has 

 continued his observations on this subject, and in a preliminary note 

 gives a list of his chief results, the more important of which are as 

 follows. The eggs are of the meroblastic type and contain a large 

 amount of yolk, the segmentation is centrolecithal, and the yolk re- 

 mains unsegmented. All the segmentation nuclei pass to the surface 

 of the egg and take part in the formation of the blastoderm. Three 

 pairs of Nauplius appendages appear at an early stage in the space 

 between a posterior and two anterior thickenings on the ventral surface. 

 The cells of the posterior thickening give rise to a mass of meso-endo- 

 derm cells, from which endoderm and mesoderm originate. The former 

 spreads over the whole yolk and forms the large mesenteron, while the 



* Rev. Suisse Zool., viii. (1900) pp. 97-105 (1 pi.). 



f Arbeit. Zool. Inst. Univ. Wien, xiii. (1900) pp. 1-32 (1 pi.). 



X Zool. Anzeig., xxiii. (1900) pp. 493-5. 



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