174 



Part III. — T'lrenty-first Annual Report 



winter, i.e. before it was two years old. They had been reared from the 

 size of 2*5 and 6 mm. respectively. Neither had during its captivity 

 been in contact with the male crab. The eggs did not become properly 

 attached to the swimmerets : they were all thrown oft' within a month 

 of extrusion. 



Absorption Area on Chela. 



A part of the shell of the coxopodite of the chela becomes decalcified 

 at the time of casting, a soft area similar to that found in the lobster at 

 that time, appearing in the crab also. This is regarded by Herrick as 

 an arrangement necessary for permitting the withdrawal of the chela 

 from its shell. 



Dr. Hansen, Copenhagen, and Dr. Caiman, British Museum, have 

 kindly assisted me with references to literature. 



LITERATURE. 



BouviER, E. L. — " Sur le developpement embryonnaire des Galatheides du genre 



Diptychus." Comptes Rendus Acad. Sci, cxiv, 1892, p. 767. 

 Brook. — "On the Rate of Development of the Common Shore Crab {Carcinus 

 mcenas),'' Annals and Magazine of Natural History (V.), vol. xiv., 1884, 

 p. 202. 



Calman.— " On the Genus Anaspides and its Affinities with certain Fossil Criis- 

 tacea." Trans. Roy. Socy. Edin., vol. xxxviii., pi. iv. 



Gang. — "Morfologia deU'apparecchio sessuale feminile, glandole del cemento e 

 fecondazione nei Crostacei Decapodi," Mittheil. a. d. Zool. Stat. Neapel, 

 ix Bd., 4 Hft., 1890. 



Claus. — " Neue Beitrage z. Morphol. d. Crustaceen." Arh. a. d. Zool. Inst. 



Wien, vi., 1886, p. 44. 

 Claus. — "Zur Kenntniss der Malakostrakenlarven," Wurzhurger Naturioissen. 



Zeitschriff, 2 Bd., 1861, p. 23. 

 Couch, R. Q. — "On the Metamorphosis of the Decapod Crustaceans," J^^/e^?e?^^/t 



Annual Report of the Royal Cornwall Polytechnic Society, Falmouth, 1843, 



Ipl. 



Cunningham. — "On the early Post-larval stages of the Common Crab Cancer 



^agfiirttsj, and on the Affinity of that Species with Atelecyclus heterodon. 



Froc. Zool. Socy. Lond., March, 1898, 1 pi., p. 204. 

 Du Cane. — "On the Metamorphosis of the Crustacea," Annals of Natural 



History, vol. iii., 1839, 1 pi. 

 Faxon. — "On some points in the Structure of the Embryonic Zotia," Bidl. Mus. 



Compar. Zool., Harvard, vol. vi., No. 10, 2 pi., p. 159. 

 Leon Fredericq. — " Nouvelles Recherches sur lAutotomie chez les Crabe," 1891. 

 ,, ,, — " LAutotomie ou la Mutilation active dans le r^gne animal," 



Bidl. de PAcad. roy. de Belgique, 3e. Ser., t. xxvi., No. 12, pp. 758-772, 



1893. 



GuRNEY. — "The Metamorphosis of Corystes cassivelaunus (Pennant)," The 



Quarterly Journal of Microscopical Science, vol. 46, N.S. 

 Hansen. — "A Contribution to the Morphology of the Limbs and Mouth-parts of 



Crustaceans and Insects," The Annals and Magazine of Natural History 



(VL), vol. 12, 1893, p. 417. 

 Hensen. — "StudieniiberdasGehororgan der Decapoden," Zeitschr.f wissenschaft. 



Zoologie, 13 Bd., p. 319, 1863, 4 Taf. 

 Herrick.— " The American Lobster." Bidl. U.S. Fish Commission for 1895. 



Washington, 1895. 



Howes. — Opening Address to the Section of Zoology.— Meeting of the British 

 Association, Belfast, 1902. Nature, vol. 66, 1902, p. 527. 



Huxley. — "The Crayfish— An Introduction to the Study of Zoology." London, 

 1880. 



KoRSCHELT AND Heider. — " Text-book of the Embryology of Invertebrates.' 

 London, 1899. 



