of the Fishery Board for Scotland. 



137 



Fig. 101 shows the stage immediately following, viz., 8*5 mm. The 

 lateral teeth of the carapace are now lobes having minutely notched 

 edges ; the secondary lobes are almost as large as the primary. The 

 margin of the orbit and rostrum is minutely notched. The tubercles on 

 the chela are rounded. 



In the succeeding stage, 10*75 mm. (fig. 98), a condition closely ap- 

 proaching the adult is to be noted. The notched edge of the lateral lobes 

 of the orbit and rostrum is still more prominent than in the adult. The 

 tuberculated chela is very noticeable. A distinction in size between the 

 primary and secondary lobes is still to be seen. The edge of the carapace 

 shows a triple row of tubercles. The dorsum also is tuberculated. 



The sixth cast, 14*5 mm. (fig. 76), is represented in figs. 99 and 97, 

 the former showing the frontal region. The lobes of the edge of the cara- 

 pace are on the whole very similar to the adult condition. The chela is 

 still tuberculated, and the triple row of tubercles which has succeeded 

 the notches is very prominent. 



In the cast shell shown in fig. 77 (19*5 mm. across) the tubercles are 

 prominent but smaller. 



They are further reduced in the next stage, viz., 24'5 mm. (fig. 78), 

 and in that immediately following, viz., 30 mm. (fig. 79), the tubercles 

 are practically reduced to the condition in the adult. 



Fig. 81, the last of the series, was not made from the actual specimen, 

 but is a drawing of a crab of the same size. 



LITERATURE. 



Braun. — " Zur Kenntniss des Vorkommens der Speichel — u. Kittdriisen bei den 

 Decapoden." Arbeit a. d. Zool. Instit. in Wiirzburg, iii. Bd., pp. 121-166, 

 Taf. viii.-ix., 1875. 



Brocchi. — " Recherches sur les organes genitaux males des Crustaces decapodes." 



Annates des Sciences naturelles, Zoologie et Paleontologie, t. ii., 1875. 

 Cano. — " Morf ologia dell' apparecehio sessuale femminile, glandole del cemento e 



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



ix Bd., 4 Hft., 1890, pp. 503-532, 1 tav. 



Cuenot. — " Etudes physiologiques sur les Crustaces decapodes." Archives de 



Biologie, t. xiii., 1895. 

 Cunningham. — "On the Early Post larval Stages of the Common Crab (Cancer 



pagurus), and on the Affinity of that Species with Atelecyclus heterodon." 



Proceedings of the Zoological Society of London, March 15, 1898. 

 Duvernoy. — "Fragments sur les organes de generation de divers animaux." 



Mimoires deVAcademie des Sciences deVInstitut de France, t. xxiii., Paris, 



1853, p. 105, pi. i.-ix. 

 Grobben. — "Beitriige zur Kenntniss der mannlichen Geschlechts-organe der 



Dekapoden." Arbeit a. d. Zool. Instit. d. Universitdt, Wien, 1 Bd., pp. 1-94, 



Taf. i.-vi., 1878. 



Heath. — "The Breeding Habits of Cancer magister." American Naturalist, 

 xxxvi., pp. 501, 502. 1902. 



Herrick. — " The American Lobster : A Study of its Habits and Development." 



Bulletin, U.S. Fish Commission, for 1895. 

 Lerebotjllet. — " Recherches sur le mode de fixation des ceufs aux fausses pattes 



abdominales dans les ecrevisses." Annates des Sciences naturelles, ser. 4e 



(Zoologie), t. xiv., 1860, p. 359. 



/ 



" De la maniere dont les CEufs des Ecrevisses s'attachent aux fausses 



pattes abdominales." — Ulnstitut, t. xxi., No. 998, p. 64. 1853. 



M'Intosh. — " On the Hairs of Carcinus mamas." Trans. Linnean Society, vol. 

 xxiv. 



Mayer, P. — "Sur Entwicklungsgeschichte der Dekapoden." — Jeoa. Zeit 

 Naturw., 11 Bd., 1877. 



