34 Crust. 
CRUSTACEA. 
Scorpio , and the tubular glands (Nephrida) at the base of each leg in 
Peripatus ; E. R. Lankester, Z. c. 
The minute structure of the eyes of Limulus is the subject of a paper 
by E. R. Lankester & A. G. Bourne, who come to the conclusion that 
this genus belongs to the Arachnids ; Q. J. Micr. Sci. xxiii. pp. 177-212, 
3 pis. 
Limulus polyphemus. The male differs from the female in the shape 
of the claws and position of the genital orifices ; the latter difference 
exists even in the very youngest, the former only in the well-grown 
male. The females reach a breadth of ten to twelve inches, the males 
only of eight to ten inches. The increase in size at the time of shedding 
is remarkable, the length of the carapace increasing at one moult in very 
young ones from 2 to 3 mm. and from 3 to 4.2 mm., in a specimen 
about one year old from 11.5 to 20 mm. B. F. Koons, Am. Nat. xvii. 
pp. 1297-1299. 
A. S. Packard describes the moulting of Limulus polyphemus ; not 
only the outer shell, including all the spines and hairs, but also the 
chitinous lining of the oesophagus and proventriculus (the stomach of 
most authors), and the seven pairs of apodomes, are shed : Am. Nat. xvii. 
p. 1075 ; abstract in J. R. Micr. Soc. (2) iii. p. 836. 
The question of Willemoes-Sulim’s supposed larva of Limulus [Zool. 
Reo. xix. Crust, p. 39] is also treated in Q. J. Micr. Sci. xxiii. pp. 145-150. 
