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THIRD DIVISION, CLASSES— CRUSTACEA, ARACHNIDA, 



AND INSECTA. 



CRUSTACEA. (P. 407—448.) 



The British Malaeostracous Crustacea form the subjects of two valuable works ; one, by Dr. Leach, in quarto, 

 with beautiful coloured plates, representing each species of the natural size ; and the other now in cuur.se of pub- 

 lication by Professor Thomas Bell, forming part of -Mr. Van Voorst's beautiful series of works upon Uritish 

 Natural History. 



An invaluable series of illustrations of the whole of the class Crustacea, has been published by Milne Edwards, 

 in the Crochard edition of the Regne Animal. 



The Crustacea of D'Orbigny's Voyage have also been more recently described and beautifully figured by Milne 

 Edwards, and those of the voyage of the Samarang, by Mr. A. White (now in course of publication). Other new 

 species have also been described by Mr. White in detached papers in the Annals of Natural History. 



The periodical casting of the shell by these animals after their arrival at their adult form, led to the long-received 

 Opinion Chat they had not previously undergone any decided metamorphosis. The recent investigation, of several 

 anthon have, however, clearly proved that the young fry in many species are quite unlike their parents, and that in 

 fad tin j arc the animals which had been previously considered as distinct Entomostracans, under the name of 

 "/.'>• :i. It is singular, however, that the fry of the common Cray-fish (as observed by Kathke), and of the land Crabs, 

 do not materially differ from the adult state. 



A new and remai kable genus, named Calocaris by Professor Bell, belongs to the Decapod Macroura and subsection 

 Astacini (p. 420), but with elongated limbs, a very thin crust to the body, destitute of all colouring pigment, and of 

 cornea- in the eyes. C. Hacandres, a species found in Loch Fyneandthe Mull of Galloway, inhabits a depth 



of no less than ISO fathoms, where of course distinct vision would be useless and unavailing, which accounts for the 



rodimental character of the eyes, which are entirely white. 



Dr. Erichson has recently published a memoir on the genus Astacus (p. 420), describing a number of additional 

 species Of Gray-fish from various parts of the world. 



Several Other new and int. resting British genera allied to Mysis (p. 422), have been described by II. Goodsir in 

 thl New Edinburgh Philosophical Journal. 



Zeuxo, Templeton in Trans. Ent. Soc. ( Z. Westwoodl ini ) ; and Crossurus and Liriope of Kathke (Nova Acta, Vol. 

 XX.) are small but remarkable genera closely allied to Bhaea, p. 428. 



Many additional species as well as several new genera of Amphipoda (p. 429), have also still more recently L. I n 

 described by Kathke, in Nova Acta, Vol. XX., and in Kn.yer's Tidsskrift ; and in a very interesting genus named 

 Chdura terebrans, which burrows into submerged wooden structures in the same manner as Limnoria, has also 

 been described by Philippi in the fourth Volume of Wiegmann's Archives. 



II. Goodsir has also added some new and very distinct British species of Amphipods in the Edinburgh New Philo- 

 sophical Journal, Vol. XXX II I. 



II. Goodsir has described a third species of Bopyrus fp. 431) in the Annals of Nat. Hist.. V..1. XV., found beneath 

 the carapace of Hippolyte enfliferuaj and Rathke lias described and figured, with all its details, a new allied genua 

 named Phryxus, also found beneath the shells of different Maerourous Crustacea (Nova Acta, Vol. XX ) of which 1 

 possess a liritish specimen. 



A very elaborate paper upon the destructive I.iininnia ten brans (p. 432), has been published by Dr. Coldstream 



in the seventeenth volume of the Edinburgh New Philos. Journal. 



Two additional British speei.s of Areturus p t ; '. . have also been described 1 y II. Goodsir. 



The del I Lopment of the eggs and young of Asellus aquaticus (p. 433), has formed the subject of a v.ry elabo- 

 rate memoir by Hatlike, published in the second volume of the second scries of the annales des Bdencea N.itu- 

 relles. 



II. Coo.i-ir has described several new British species of the singular genus Cuma (p. 187), as well as tw.> new 

 ami allied genera, named Bodotria and aJauna, In the thirty -fourth volume of the Edinburgh (Ten Phi 



Journal. 



Dr. Hand's Papers on different portions of the I'ntomostra. i. published in the Annals ,.f Natural History, must 



be consulted, and also a paper bj the same gentleman, in the first volume of the Zoologist, upon other spei 



which are luminous, and inhabit the ...van ; Including the genera Olthona and Cyolopsina, At IgSl the minute 



luminous ...earn, species, and prohabiy, in the present order of Branchlopoda, must also be ranged the genua 

 8appkirina of Edwards, aa well aa several other minute species and genera n an) j d - rlbedbj Geodair, pi 

 liar for possessing a double eye In a single dark spot, with the bodj depressed as in the Isopoda, and the poeterior 

 thoracic legs double. They are very active In their habits, and swim about iii company with other alii. .1 ffftntf. 

 They constitute the genera Zaws, Storops, and firiUus. The Oniaous fulgens of Hit to ti „ 



x \ 



