138 



Part III. — Twenty-second Annual Report 



Meek. — Various Papers on the Crab in the Reports of the Northumberland Sea- 

 Fisheries Comviittee— 1898-1903. 



Rathke. — " Untersuchiingen ueber die Bildung u. Entwickeliing der 

 Fhisskrebses," folio, Leipzig, 1829. 



Sabatier. — " De la Spermatogenese chez les Crustaces decapodes." Travaux de 

 rhistitut de Zoologie de Montpellier et de la Station maritime de Ce.tte 

 (Sabatier et Rouzaud), nouvelle serie, memoire No. 3, Montpellier, 1893. 



Scott. — " On the Spa\vning of the Common Lobster." Report of the Lancashire 

 Sea-Fisheries Laboratory for 1902, No. xi., Liverpool, 1903, p. 20. 



TuLLBERG. — " Studien iiber den Ban u. das Wachsthum des Hummerspanzers u. 

 des Molhiskenschalen," 12taf. Kql. Veternsk. Akad. HandL, 19 Bd. Stock- 

 holm, 1882. 



ViTZOU. — " Recherches sur la Structm-e et la Formation des Teguments chez les 

 Crustaces decapodes." Archives de Zoologie E.xpirimentale et G6n6rale, t. x. , 

 Paris, 1882. 



Williamson. — "Contributions to the Life-History of the Edible Crs^h {Cancer 

 pagurus)." Eighteenth Annual Report of the Fishery Board for Scotland, 

 Pt. IIL, 1900. 



"On the Larval and Early Young Stages, and Rate of Growth, of 



Carcinus 7n(ffnas." Tioenty-first Annual Report of the Fishery Board for 

 Scotland, Pt. IIL, 1903. 



Wilson. — Northximberland Sea-Fisheries Committee. Reports on the Crab 

 Fishery, 1893 and 1895. Newcastle-on-Tyne. 



WiTTEN. — "On the Structural Changes accompanying the Ecdysis of the Crab." 

 Northumberland Sea Fisheries Committee. Report on the Scientific Lncestiga- 

 tions for the year 1902, Newcastle-on-Tyne, 1903, p. 53. 



"On the Structural Changes accompanying the Ecdysis of the Crab' 



Cancer pagurus." Northimiberland Sea-Fisheries Committee. Report on the 

 Scientific Livestigations for the year 1903. Newcastle-on-Tyne, 1904, p. 42. 



Letters Used. 



A . — antenna. 



a. — basal bone. 



ah. — abdomen, 



an. — anus. 



ant. — antennule. 



ar. — arm of second penis. 



h. — basal bone. 



c. — core. — ctecum, fig. 38. 



car. — carapace. 



chr. — chorion. 



dis. — egg with distended chorion. 



e. — eye. 



en. — endopodite. 



ex. — exopodite. 



/. -follicle. 



g.pj. — genital papilla. 



i.ch. — inner chevron (Istabdom. sec 



i.Z.- -inner layer. 



y.— joint. 



m. — membrane. 



mu. — muscle. 



o.ch. — outer chevron (1st abdom. seg.). 



o.l. — outer layer. 



lp.-2p. — first and second penes. 



p. — p. — plane of movement of distal 



parts of endopodite of right side. 

 23'. — p' . — plane of movement of distal 



parts of endopodite of left side. 

 p.f. — peri vitelline fluid. 

 r. — rod. 



si. — solid in spermatheca. 

 s. e. — secondary envelope. 

 sp.- — sperms. 



sp.w. — wall of spermatheca. 

 th. — thorax. 

 V. — valve, vulva. 

 v.d. — vas deferens, 

 v.m. — vitelline membrane. 

 v.w. — wall of vagina. 

 yJc— yolk. 



EXPLANATION OF PLATES. 



Plate II. 



All the drawings are of Cancer pagurus, with the exception of Figs. 27, 28, and 

 29, which are of Munida riigosa. 



Figures 1, 3, 5, 11, 12, IS, 21, 23?), 24, 34, 35, and 36 were outlined by aid of 

 the camera lucida. 



Fig. 1. Eggs impaled by hair of endopodite. November 30, 1900, 



Fig. 2. Lobule of ovary, showing a few distended eggs, dis. magnified. 



Fig. 3. Eggs in later stage of attachment than Fig. 1 . 



Fig. 4, Transverse section of first penis near base, magnified. 



57 

 57 



