INVERTEBRATA, CRYPTOGAMIA, MICROSCOPY, ETC. 249 



it very loosely. Two small glands open into the vagina at the end of 



the oviduct, and their secretion serves to agglutinate the ova together. 



Further results are promised shortly ; the subject was undertaken 



as being that for which a pi'ize was oftered by the University of Leiden. 



Post-embryonal Development of Glyciphagus.* — Herr Kramer, 

 in opposition to Muguin, comes to the conclusion that the generative 

 orifice is developed at a pi-oportionately early, that is the second, 

 stage ; and that it is impossible rigidly to distinguish between a 

 larva- and a nymjih-stage. He points out that, at any rate, in the 

 form whicli he has examined there is no nymph-stage in the sense 

 of Duges or Megnin, for the first eight-footed stage is characterized 

 also by the presence of a genital oriiice, even though that orifice have 

 only two suckers. With regard, further, to the mode of coj)ulation 

 amongst these mites, Kramer thinks what was taken by Megnin for 

 the copulatory act is only something introductory to it ; in copula- 

 tion the male has its ventral surface closely appressed to the female, 

 and itself lies upon its back. 



S. Crustacea. 



New Crustacea. t — Mr. Thomson describes two new Isopods from 

 New Zealand, which seem to be of rare occurrence; the first, for 

 v/hich he suggests the specific name of tuherctdatus, belongs to the 

 genus Arcturm, and is most like, apparently, the A. corniger of 

 Stebbing ; the materials for the description of Tanais Novm- 

 Zealandioi consisted of a single specimen ; it appears to be the 

 southern representative of T. vittatiis of Lilljeborg, but it differs 

 from it in some striking specific characters. 



Mr. Thomson also describes a new species of Nehalia, which from 

 tlie length of its antennto he proposes to call longicornis, and takes 

 this opportunity of expressing the opinion that the i)roposition of 

 Packard to make a new order Phijllocarida for the Nebaliads is a better 

 plan than that of the late Willemocs-Suhm, who would have enlarged 

 the group Schizopoda for their reception. 



Mr. H. N. Ridley also describes a new Copcpod (Doridicola anthece) 

 which he found in the tentacles of a dark purplish-slate colour 

 variety of Authea cercns. 



New Fossil Deeapod.ij: — Mr. R. P. Wliitfield describes (from the 

 Upper Devonian rijclis of Uliio) the remains of a Macrouran Decapod 

 wliicli appears to dittcr so much from any described genus as to 

 make it undesirable to refer it to any of them. One of its pecu- 

 liarities consists in the possession of a i)air of very strong antenual 

 appendages which proj(!ct from beneath tlie anterior end of tlie tlioracic 

 carapace, of such size and strength as to raise considerable doubt as 

 to their true nature. The existence of five thoracic limbs, exclusive 

 of these, projecting from beneatli the carapace on one side would seem 

 to place their pechvl nature out of th(! question, while their great 

 develo2)ment would indicate tliat they had served some purpose other 



♦ ' Arch. Nature,'.,' xlvi. (1880) p. 102. 



t ' Ann. an<l Muj,'. Nat. Hist..' iv. (1H7'.>) pp. 415. US, ami 4:)8. 



X • Am. Juurn. Sci.,' xix. (1880) p. 315. 



