100 The American Geologist. February, issir) 
basiil Joint; ulso the bir;iinous ci')ili;ilic apiuMidages. witli largo 
giiathobascs: the biramoiis thoracic limbs, with gnathobasos ex- 
tending oblicjuely backward in the axis of the trilobite: and the hy- 
iwstoma, metastoma, and anus, in tiic median line. X4. Utira xlittc, 
near Rome, X. \ . 
Pr.ATK V. 
TUIAHTHKUS BECK! Green. 
Figure 1. — Diagrammatic restoration of second thoracic limb in trans- 
verse section of trilobite; showing gnathobases extending under the 
axis toward the median line, and the biramous limbs under the 
pleura and beyond the carai)ace. 
Figure 2. — Diagrammatic restoration of anterior pair of pygidia! limbs; 
showing phyllopodiform structure. 
Figure 3. — Diagrammatic restoration of posterior pair of pygidiallimbs; 
showing more strongly the primitive phyllopodous structure. 
Figure 4. — Dorsal view of .second thoracic leg, with gnathobase. Xl~. 
Figures5. 6. 7. — Dorsal views of three heads; sliowing antennules. Their 
position in figure 7 is the most common. 
Figures. — Portion of under side of liead; showing platelike gnathoba- 
.ses of cephalic limbs, posterior part of hypostoma, the metastoma, 
and one endoi)odite on the right. X-l. 
Figure 9. — Under side of heail with gnathobases and metastoma better 
preserved. X4. 
Figure 10. — Under side of head; showing antennules and their points of 
attachment, the four pairs of gnathobases of the other cephalic 
limbs, and the hypostoma and metastoma in the median line. X4. 
Figure 11.- -Diagram; showing the cephalic appendages preserved in 
figures 5, 0, 7, and figure 1, j)late iv. 1, shaft of antennule bearing a 
single fiagellum; 'I. coxopodite of first pair of biramous limbs, or 
posterior antennse: :>, third pair of cephalic limbs, or mandibles; 4, 
5, gnathobases of fourth and fifth pairs of cephalic limbs, or max- 
illa;; hy, hypostoma: tn, mouth; met, metastoma; «, set;e. This 
figure is not intended as a complete restoration of the cejjhalic ap- 
pendages, but only as a diagram for convenient reference, combin- 
ing the characters preserved in the specimens illustrated. 
Figure VZ. — Portion of the under side of the head and thorax of Apus\ 
lijl, hypostoma: 1, antennule; 2. posterior antenna; ^, mandibles: 4, 
5. maxilhe; 6, maxilliped: 7. first thoracic leg: S. 0, basal enditesof 
phyllopodiform legs. X-t. 
THE SECOND LAKE ALGONQUIN. 
By Frank Bursley Taylor. Fort Wayne. Ind. 
(Pi- ATE VI.) 
Intkoduotion. 
One of the results of recent explorations of the upper great 
lakes has been the finding of conclusive proof that their 
