102 
ANATOMICAL DESCRIPTION. 
The external eliaraeteristics of Symenolejjis lanceoJata are so well 
marked that its recognition has never been considered difficult. F euer- 
Fitr. 106. — Head and .^trobila of H. lanceolata. Natimil size. Original type figure. (After Bloch, 
1782a, pi. 1, fig. 5.1 
Fig. 109. — Head and anterior portion of H. lanceolata. Enlarged. C)riginal type figure. (After 
Bloch, 1782a. pi. 1. fig. 6. 
Fig. 110. — Head and strobila of H. lanceolata from a g<X)se. Natural size. (After Goeze. 17S2a. pi. 29. 
fig. 3.) 
Fig. 111. — Head with protracted ro.'^tellum and anterior portion of H. lanceolata. Enlarged. (After 
Megnin, 1881, pi. 4. fig. 3.) 
Fig. 112. — Head with retracted rostellum and anterior portion of H. lanceolata. Enlarged. (After 
Railliet, 1886. p. 267. fig. 163A. also Railliet. 1893. p. 300. fig. 195A.) 
Fig. 113. — The eight hooks upon the rostellum of H. lanceolata. Enlarged. (After Krabbe, 1869, 
pi. 6, fig. 143.) 
Fig. 114.— Two isolated hooks of H. lanceolata. Enlarged. (After Krabbe. 1869. pi. 6. fig. 144.) 
eisen (1868a) was the first to study its internal anatomy: his incom- 
plete and in some respects incorrect description has recently been 
revised and added to by Wolfihligel (1900b) and Cohn (1901b). 
