Bull.U. S. F. C. 1895. The American Lobster. (To face page 77. ) 
Plate A. 
Cut 4. — Part of transverse section of exopodite of pleopod 
of female lobster (the cuticle removed), showing the dis- 
tribution of the cement glands. July 19, 1891. 
Bl. S, blood sinus, ep, cliitinogenous epithelium. T. G, 
tegumental gland. 
Cut 5. — Diagram of vertical section through skin, showing a tegumental gland (relatively much smaller than represented) 
in section and its duct opening to the exterior, also hair pores perforating the cuticle, with the superimposed hairs or setie. 
The structure of the cuticle or shell is diagram matically shown. 
Bl. /S', blood sinus, cap, capsule of tegumental gland. D, dermis, d, duct of gland, d 1 , mouth of duct, ep, cliitinogenous 
epithelium. Gd. C, gland cell. H.p, hair pore. Mu, muscle. N, nerve, supplying gland. SC, central nerve cell, s', plumose 
hair, s , simple hair. 1 , enamel layer of shell. 2, calcified pigmental layer of shell. 3. calcified non- pigmented layer. 4, inner 
non-calcified layer of shell. 
Drawn by F. IT. Herrick. 
