ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 63 



e. Crustacea. 



Larval Forms of Crangonidae.* — Robert Gurney gives an account of 

 the larva? of two species of Crangonidre — Cheraphilus trispinosus and 

 JEgeon fasciatus. He describes the characteristic features of the larvse, 

 and gives at the end of his paper a diagnostic table for the distinction of 

 all Crangonid larva? at present known. In many cases he has been able 

 to confirm the descriptions that Sars has given of the larval forms. 



Cladoceran new to Britain.f — R. Gurney has found Scapholeberis 



aurita S. Fischer in three localities in Norfolk. He compares its swim- 

 ming habits and some points in its structure with Scourfi eld's description^: 

 of 8c. mucronata 0. F. Muller. The two species swim on their backs 

 suspended by the surface film, but the mechanism is different in the two. 



New Copepod Genus. § — Adolf Steuer describes a Copepod which he 

 finds in great abundance in the intestine of Mytilus yalloprovincialis. 

 It requires a new genus, and he names it Hytilicola intcstinalis n.g. et sp., 

 within the family Dichelestiina. From its size, relative transparency, 

 frequency of occurrence, and the ease with which it may be kept free 

 living in an aquarium, he has found it well suited for thorough observa- 

 tion. In his present communication he gives a full account of the 

 vascular system, shell glands, reproductive organs, and other parts. 



Copepoda of Basel. || — A. Graeter, in a very full paper, gives an 

 account of the Copepods of this region, and discusses, with the help of 

 analytical tables, the horizontal and vertical distribution of the species in 

 the different areas. The chief interest of the memoir is as regards 

 distribution. 



British Freshwater Entomostraca.1T — D. J. Scourfield continues his 

 synopsis of the known species of British freshwater Entomostraca. He 

 gives a list of the free-swimming and of the parasitic Copepoda, to which 

 is added a table of distribution in England and in Scotland. Anions; the 

 free-swimming forms, he notes the occurrence of BeJisarius viguicri in 

 Regent's Park, London, and Kew Gardens. This form is peculiar in its 

 habitat — the cups formed by the leaves of Bromeliaceous plants ; it is 

 remarkable in being blind, in having no ovisac, and in having a special 

 vibrating organ in the region of the shell-gland. 



Variation in Cyclops.** — Harriet Lehmann undertook the investiga- 

 tion of the variations in form and size of Cyclops brevispinosus and 

 Cyclops americanus, with special reference to the question of specific 

 distinction between these forms in the furca and the armature of the 

 fourth swimming foot. She found that the range of variation was very 

 great, so much so that the specific differences between the two forms are 

 not trustworthy. She advocates a careful study, and thinks the result 

 would be a re-classification of the species and varieties. 



* Journ. Mar. Biol. Ass., vi. No. 4 (1903) pp. 595-7. 

 + Ann. Nat. Hist., xii. (1903) pp. 630-3 (2 figs). 

 % Journ. Linn. Soc. (Zool.) xxv. (1894) | p. 1-19. 

 § Arbeit, ^ool. Inst. Univ. Wien, xv. (1903) pp. 1-4G (5 pis.). 

 II Revue Suisse Zool., ii. fasc. 3 (1903) pp. 419-541. 

 ^ Journ. Quekett Micr. Club, viii. (1903) pp. 531-44. 

 ** Trans. Wisconsin Acad. Sci., xiv. (1903) pp. 279-98 (4 pis). 



