102 
AXATOMICAL DESCRIPTION. 
The external characteristics of HyraenolejjU Janctolata are so well 
marked that its recognition has never been considered difficult. F euer- 
Fig. 108. — Head and strobila of H. lanceolata. Natural size. Original type tigure. (After Bloch, 
1782a, pi. 1, fig. 5.) 
Fig. 109. — Head and anterior portion of H. lanceolata. Enlarged. Original type figure. (After 
Bloch, 1782a, pi. 1. fig. 6. 
Fig. 110. — Head and strobila of H. lanceolata from a goo.se. Natural size. (After Goeze, 1782a, i>l. 29, 
fig. 3.) 
Fig. 111. — Head with protracted rostellum and anterior portion of H. lanceolata. Enlarged. (After 
Megnin, 1881, pi. 4, fig. 3.) 
Fig. 112. — Head with retracted rosteUnm and anterior -portion of H. layiceolata. Enlarged. (After 
Railliet, 1886, p. 267, fig. 163.\. 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 IVolfibiigel (1900b) and Cohn (1901b). 
