On the Anatomy of Sacculina. 



313 



distended with ova, and adhering to the purse of a Cancer 

 pagurus. 



Sacculina inflata, Leuckart, fig. 15 (Wiegmann's Archiv\, 1S59, 



p. 232.) 



Diagnosis. — Dorsi et ventris superficies multum arcuata est ; posteriore 

 foramine a corporis margine aliquantum remoto : parasitica in Hyade 

 araneo. 



I only know of this species through the description given 

 of it by its discoverer. 



Bibliography, 



Cavolini. Sulla Generazione dei Pesci e dei Granchi. 4to. 

 Naples, 1787. 



Thompson, W. Entomol. Magaz., vol. iii. 1836. Pp. 452-456. 

 Bathke. Beitr. zur Fauna Norwegens. 1842. Pp. 244-247, 



tab. 12, figs. 18, 19. Neueste Schriften der Nat. Ges. in 



Danz. 



Bell, Thos. A History of the British Stalk-eyed Crustacea, 

 p. 108. 



Schmidt, 0. Das Weltall, No. 3. 1854. 



Steenstrtjp. Oversigt k. Danske Selsk. Forhandlgr. 1854. 



No. 3. Pp. 145-158. Archivf. Naturg. 21 Jalir. 1855. 



Bd. i., pp. 15-19. Ann. of Nat. Hist. 2 ser. vol. xvi. 1855. 



Pp. 155-62. 

 Dieslng. Systema Helm., vol. i. pp. 434-435, 

 Leuckart. Wiegmann's Archiv. 1859. P. 232. Ann. of 



Nat. Hist., 3 ser. vol. iv. 1859. Pp. 422-429. 

 Lilljeborg, Wilh. Nova Acta Beg. Soc. Sc. Upsal. Ann. of 



Nat. Hist., 3 ser. vol. vi. pp. 162-173, and pp. 260-267 



Explanation of Plate XIII. 



Fig. 1. Larva of Sacculina; first stage : a, eye ; b, oesophageal ring?; c, horns 

 of carapace ; d, first pair of feet ; d', second pair of feet ; d", third 

 pair of feet ; e, terminal spines ; /, supposed anterior spines ; g, cen- 

 tral cellular mass of the body. 



Fig. 2. Dissection of S. triangularis : a, portion of external sac reflected ; 



b, peduncle ; c, ovario-branchial orifice ; d, horny disk ; e, corium ; 

 h, internal ovaries ; i, ovigerous lamellae ; Jc, portion of peduncle 

 prolonged beyond the horny disk; I, vesicles ; o, tubercle of anterior 

 surface. 



Fig. 3. Anterior surface of interior ovaries removed from their connections ; 



g, the septum ; h, mass of internal ovaries ; o, tubercle (oviduct ?) 



e, portion of adhering corium [these letters apply also to fig. 3'] ; 



I, the vesicles. 

 Fig. 3'. Posterior view of internal ovaries of S. carcini. 



